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DESpecs 2.0 Autumn 2009
author Klaus Thoden <kthoden@mpiwg-berlin.mpg.de>
date Thu, 02 May 2013 11:14:40 +0200
parents 22d6a63640c6
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<?xml version="1.0" encoding="utf-8"?><echo xmlns="http://www.mpiwg-berlin.mpg.de/ns/echo/1.0/" xmlns:de="http://www.mpiwg-berlin.mpg.de/ns/de/1.0/" xmlns:dcterms="http://purl.org/dc/terms" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:echo="http://www.mpiwg-berlin.mpg.de/ns/echo/1.0/" xmlns:xhtml="http://www.w3.org/1999/xhtml" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" version="1.0RC">
  <metadata>
    <dcterms:identifier>ECHO:9EXVCG1R.xml</dcterms:identifier>
    <dcterms:creator identifier="GND:10001271X">Angeli, Stefano</dcterms:creator>
    <dcterms:title xml:lang="it">Della gravita' dell' aria e fluidi: esercitata principalmente nelli loro homogenei</dcterms:title>
    <dcterms:date xsi:type="dcterms:W3CDTF">1671</dcterms:date>
    <dcterms:language xsi:type="dcterms:ISO639-3">ita</dcterms:language>
    <dcterms:rights>CC-BY-SA</dcterms:rights>
    <dcterms:license xlink:href="http://creativecommons.org/licenses/by-sa/3.0/">CC-BY-SA</dcterms:license>
    <dcterms:rightsHolder xlink:href="http://www.mpiwg-berlin.mpg.de">Max Planck Institute for the History of Science, Library</dcterms:rightsHolder>
  </metadata>
  <text xml:lang="it" type="free">
<div xml:id="echoid-div1" type="section" level="1" n="1"><pb file="00001" n="1"/>
<pb file="00002" n="2"/>
<handwritten/>
<handwritten/>
<handwritten/>
<pb file="00003" n="3"/>
</div>
<div xml:id="echoid-div2" type="section" level="1" n="2">
<head xml:id="echoid-head1" xml:space="preserve">DELLA GRAVITA <lb/>DELL <lb/>ARIA’ E FLVIDI’ <lb/>ESERCITATA</head>
<p>
  <s xml:id="echoid-s1" xml:space="preserve">Principalmente nelli loro homogenei. <lb/></s>
  <s xml:id="echoid-s2" xml:space="preserve">_DIALOGI PRIMO, E SECONDO FISICO-MATEMATICI_.</s>
  <s xml:id="echoid-s3" xml:space="preserve"/>
</p>
</div>
<div xml:id="echoid-div3" type="section" level="1" n="3">
<head xml:id="echoid-head2" xml:space="preserve">D I <lb/>STEFANO DE GL’ANGELI, <lb/>LETTOR MATEMATICO <lb/>nello Studio di Padoua.</head>
<handwritten/>
  <figure>
    <image file="00003-01" xlink:href="http://echo.mpiwg-berlin.mpg.de/zogilib?fn=/permanent/library/9EXVCG1R/figures/00003-01"/>
  </figure>
<p>
  <s xml:id="echoid-s4" xml:space="preserve">In Padoua, per Mattio Cadorin, MDCLXXI. <lb/></s>
  <s xml:id="echoid-s5" xml:space="preserve">_Con Lieenza de’ Superiori_.</s>
  <s xml:id="echoid-s6" xml:space="preserve"/>
</p>
<pb file="00004" n="4"/>
<pb file="00005" n="5"/>
</div>
<div xml:id="echoid-div4" type="section" level="1" n="4">
<head xml:id="echoid-head3" xml:space="preserve">AL LETTORE.</head>
<p style="it">
  <s xml:id="echoid-s7" xml:space="preserve">CRederai forſe Lettore humaniſſimo, nel veder-<lb/>mi publicare li preſenti Dialogi, circa ma-<lb/>teria, ſopra la quale hanno ſcritto tanti <lb/>grand’huomini, ch’io ſia ſtato moſſo da alcu-<lb/>na di quelle cauſe, dalle quali commemora <lb/>Tito Liuio nel Proemio delle ſue historie, ri-<lb/>ceuer impulſo quaſi ogni ſcrittore allo ſcri-<lb/>uere. </s>
  <s xml:id="echoid-s8" xml:space="preserve">_Quippè qui_ (dice egli) _cum vete_-<lb/>_rem, tum vulgatam eſſe rem videam_, <lb/>_dum noui ſemper ſcriptores, autin rebus certiùs aliquid alla_-<lb/>_turos ſe, aut ſcribendi arte rudem vetuſtatem ſuperaturos cre_-<lb/>_dunt, &amp;</s>
  <s xml:id="echoid-s9" xml:space="preserve">c._ </s>
  <s xml:id="echoid-s10" xml:space="preserve">Benche forſi queſte mie compoſitioni non contenghi-<lb/>no coſe in tutto tocche da gl’altri, nulladimeno, resta ſeruito di credere, <lb/>non eſſer ſtata alcuna di queſte cauſe, che mi babbia dato eccitamento, <lb/>perche tanto non ſuppongo di me ſteſſo; </s>
  <s xml:id="echoid-s11" xml:space="preserve">ma ſolo il deſiderio, che tengo <lb/>di giouare alli Nobiliſſimi Scolari di queſto Sapientiſſimo Studio. </s>
  <s xml:id="echoid-s12" xml:space="preserve">Li qua-<lb/>li caminando al Dottorato per li ponti delle Paripatetiche Dottrine, e <lb/>delle formalità, per lo più vedono poco, ò nulla della Filoſofia eſperi-<lb/>mentale. </s>
  <s xml:id="echoid-s13" xml:space="preserve">Eſſendo adunque questo il ſolo fine di queste mie fatiche, ſe <lb/>vedrò che detti gentiliſſimi Studenti da queſti miei ſpiegamenti ri-<lb/>ceuino qualche profitto, non mancarò con altre occaſioni di publicare <lb/>altre coſe in ſimile, &amp; </s>
  <s xml:id="echoid-s14" xml:space="preserve">altre materie. </s>
  <s xml:id="echoid-s15" xml:space="preserve">Hora che t’ è nota la vera ca. <lb/></s>
  <s xml:id="echoid-s16" xml:space="preserve">gione del mio ſcriuere, compatiſci quello, che non ti piaceſſe; </s>
  <s xml:id="echoid-s17" xml:space="preserve">maſſime <lb/>gli errori di lingua, e di ſtampa, che di tanto ſolo ti prego. </s>
  <s xml:id="echoid-s18" xml:space="preserve">E viui felice.</s>
  <s xml:id="echoid-s19" xml:space="preserve"/>
</p>
<pb file="00006" n="6"/>
</div>
<div xml:id="echoid-div5" type="section" level="1" n="5">
<head xml:id="echoid-head4" xml:space="preserve">NOI REFORMATORI <lb/>dello Studio di Padoua.</head>
<p>
  <s xml:id="echoid-s20" xml:space="preserve">HAuendo viſto per fede del Padre Inquiſitore di Pado-<lb/>ua, nel Libro intitolato della Grauità dell’ Aria, e <lb/>Fluidi Dialogi Primo, e Secondo di D. </s>
  <s xml:id="echoid-s21" xml:space="preserve">Stefano An-<lb/>geli Lettor Matematico nello Studio di Padoua, non eſſerui <lb/>coſa alcuna contro la Santa Fede Cattolica; </s>
  <s xml:id="echoid-s22" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s23" xml:space="preserve">parimente per <lb/>atteſtato del Segretario noſtro, niente contro Prencipi, e buo-<lb/>ni coſtumi, concedemo licenza a Mattio Cadorini di poterlo <lb/>ſtampare, oſſeruando gl’ordini, &amp;</s>
  <s xml:id="echoid-s24" xml:space="preserve">c.</s>
  <s xml:id="echoid-s25" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s26" xml:space="preserve">Dat. </s>
  <s xml:id="echoid-s27" xml:space="preserve">a 31. </s>
  <s xml:id="echoid-s28" xml:space="preserve">Luglio 1671.</s>
  <s xml:id="echoid-s29" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s30" xml:space="preserve">(</s>
</p>
<p>
  <s xml:id="echoid-s31" xml:space="preserve">(Nicolò Sagredo K. </s>
  <s xml:id="echoid-s32" xml:space="preserve">Proc. </s>
  <s xml:id="echoid-s33" xml:space="preserve">Ref.</s>
  <s xml:id="echoid-s34" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s35" xml:space="preserve">(Pietro Baſadonna K. </s>
  <s xml:id="echoid-s36" xml:space="preserve">Proc. </s>
  <s xml:id="echoid-s37" xml:space="preserve">Ref.</s>
  <s xml:id="echoid-s38" xml:space="preserve"/>
</p>
<p style="it">
  <s xml:id="echoid-s39" xml:space="preserve">Angelo Nicolo ſi Segr.</s>
  <s xml:id="echoid-s40" xml:space="preserve"/>
</p>
<pb o="1" file="00007" n="7"/>
  <figure>
    <image file="00007-01" xlink:href="http://echo.mpiwg-berlin.mpg.de/zogilib?fn=/permanent/library/9EXVCG1R/figures/00007-01"/>
  </figure>
</div>
<div xml:id="echoid-div6" type="section" level="1" n="6">
<head xml:id="echoid-head5" xml:space="preserve">DIALOGO PRIMO <lb/>INTERLOCVTORI <lb/>CONTE LESZCYNSKY, <lb/>OFREDI, E MATEMATICO DI PADOVA.</head>
<p>
  <s xml:id="echoid-s41" xml:space="preserve">O_Fredi_. </s>
  <s xml:id="echoid-s42" xml:space="preserve">Oimè Signor Profeſſore, che gra-<lb/>uezza di teſta, ch’ io mi ſento. </s>
  <s xml:id="echoid-s43" xml:space="preserve">O come <lb/>queſt Aria così humida, e fumoſa mi fà <lb/>dolere gl’occhi. </s>
  <s xml:id="echoid-s44" xml:space="preserve">In gratia, già che ſiamo <lb/>vicini alla caſa del Signor Conte, andia-<lb/>mo à conſumare @@ <gap/> di queſta <lb/>giornata ſeco in qualche virtuoſo diſcor-<lb/>ſo.</s>
  <s xml:id="echoid-s45" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s46" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s47" xml:space="preserve">Faciamo come V.</s>
  <s xml:id="echoid-s48" xml:space="preserve">S. </s>
  <s xml:id="echoid-s49" xml:space="preserve">comanda. </s>
  <s xml:id="echoid-s50" xml:space="preserve">Saliamo le Scale. </s>
  <s xml:id="echoid-s51" xml:space="preserve">Bi-<lb/>fogna certo che ſi trattenga nel ſuo Studio, già che l’vſcio <lb/>è ſocchiuſo. </s>
  <s xml:id="echoid-s52" xml:space="preserve">Riſchiariamoſi vn poco, accioche ne cono-<lb/>ſca; </s>
  <s xml:id="echoid-s53" xml:space="preserve">e poi con vn tratto confidente entriamo dentro. </s>
  <s xml:id="echoid-s54" xml:space="preserve">Ser-<lb/>uitor Signor Conte.</s>
  <s xml:id="echoid-s55" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s56" xml:space="preserve">_Conte_. </s>
  <s xml:id="echoid-s57" xml:space="preserve">Seruitor miei cari Patroni. </s>
  <s xml:id="echoid-s58" xml:space="preserve">Che buon vento conduce <lb/>loro Signori à fauorirmi?</s>
  <s xml:id="echoid-s59" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s60" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s61" xml:space="preserve">Non già il vento, mà ben sì vn’Aria humidiſſima ne hà <lb/>ſpinto quà ſopra.</s>
  <s xml:id="echoid-s62" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s63" xml:space="preserve">_Cont_. </s>
  <s xml:id="echoid-s64" xml:space="preserve">Se nella loro bilancia la grauezza dell’ Aria li hà ſpinto <lb/>quà ſopra, è nella mia hà impedito la diſceſa, sì che non ſia <lb/>hoggi vicito di caſa; </s>
  <s xml:id="echoid-s65" xml:space="preserve">poiche appunto la mia fantaſia s’an-<lb/>daua ragirando intorno alia grauità dell’ Aria.</s>
  <s xml:id="echoid-s66" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s67" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s68" xml:space="preserve">In gratia V. </s>
  <s xml:id="echoid-s69" xml:space="preserve">Sig. </s>
  <s xml:id="echoid-s70" xml:space="preserve">ne renda conſapeuoli di que-
<pb o="2" file="00008" n="8" rhead="_DIALOGO_"/>
ſti ſuoi penſieri.</s>
  <s xml:id="echoid-s71" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s72" xml:space="preserve">_Cont_. </s>
  <s xml:id="echoid-s73" xml:space="preserve">S’accomodino con la ſolita noſtra familiarità doue più li <lb/>aggrada, che io haurò piacere andarli delineando li embrioni <lb/>della mia mente.</s>
  <s xml:id="echoid-s74" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s75" xml:space="preserve">Che l’Aria noſtra, la qual reſpiriamo, è che ne circon-<lb/>da, ſia corpo poſitiuamente leggiero, è non ſolo riſpetti-<lb/>uamente, paragonandola con le coſe più graui, m’hà parſo <lb/>ſempre coſa impoſſibile da crederſi: </s>
  <s xml:id="echoid-s76" xml:space="preserve">poiche contenendo in <lb/>ſe ſteſſa vn’infinità di vapori, &amp; </s>
  <s xml:id="echoid-s77" xml:space="preserve">vn miſcuglio dell’ effluuij, <lb/>che eſcono da tutti li corpi; </s>
  <s xml:id="echoid-s78" xml:space="preserve">(anzi forſe nõeſſendo altro che <lb/>vn aggregato di queſti) non sò vedere come parimente non <lb/>contenga vn’aggregato delle loro minime grauità. </s>
  <s xml:id="echoid-s79" xml:space="preserve">Hò an-<lb/>co fatto gran capitale di tutte quelle eſperienze, e modi, <lb/>che per far toccar con mano queſta verità, ſono ſtati in-<lb/>uentati dalla perſpicacità di tanti Filoſofi inſigni; </s>
  <s xml:id="echoid-s80" xml:space="preserve">mà <lb/>quello penſato gl’anni paſſati dal Nobiliſſimo Signor Otto-<lb/>ne Gerickio Conſolo della famoſiſſima Città di Mag-<lb/>deburgo, m’hà parſo ſempre molto proprio, è conuin-<lb/>cente.</s>
  <s xml:id="echoid-s81" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s82" xml:space="preserve">_Ofredi_ In gratia V. </s>
  <s xml:id="echoid-s83" xml:space="preserve">Sig. </s>
  <s xml:id="echoid-s84" xml:space="preserve">me lo dia ad intendere, perche non ſolo <lb/>queſto, ma tutte le coſe dicoteſto Signore mi rieſcono to-<lb/>talmente<gap/>.</s>
  <s xml:id="echoid-s85" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s86" xml:space="preserve">_Conte_. </s>
  <s xml:id="echoid-s87" xml:space="preserve">Io impreſtarò à V. </s>
  <s xml:id="echoid-s88" xml:space="preserve">S. </s>
  <s xml:id="echoid-s89" xml:space="preserve">queſto Libro, ch’è la _Technicha Cu-_ <lb/>_rioſa_ del dottiſſimo P. </s>
  <s xml:id="echoid-s90" xml:space="preserve">Gaſparo Scotti Geſuita, il quale nel <lb/>_Lib_. </s>
  <s xml:id="echoid-s91" xml:space="preserve">1. </s>
  <s xml:id="echoid-s92" xml:space="preserve">_Cap_. </s>
  <s xml:id="echoid-s93" xml:space="preserve">1. </s>
  <s xml:id="echoid-s94" xml:space="preserve">dichiara, in che maniera, da vn recipiente, <lb/>ò vaſo di vetro beniſſimo otturato, faceſſe leuare detto Si-<lb/>gnore a poco apoco, con non lieue fatica, quaſi tutta l’a-<lb/>ria, che lo riempiua, ſenza che nel vaſo poteſſe entrare <lb/>(ſi preſume) coſa alcuna, almeno non aria; </s>
  <s xml:id="echoid-s95" xml:space="preserve">(artificio pur <lb/>anco ſpiegato dal nobiliſſimo Roberto Boile Ingleſe nelſuo <lb/>Trattato _de Vi Aeris Elaſtica_, e da altri) e dal differente peſo <lb/>di queſto vaſo prima pieno d’Aria, e poi ſenza quella già <lb/>eſtratta, raccoglieua e che peſaſſe, e quanto. </s>
  <s xml:id="echoid-s96" xml:space="preserve">Dice adun-<lb/>que nel _Cap_. </s>
  <s xml:id="echoid-s97" xml:space="preserve">2. </s>
  <s xml:id="echoid-s98" xml:space="preserve">che da vn recipiente capace di 32. </s>
  <s xml:id="echoid-s99" xml:space="preserve">miſure d’-<lb/>Herbipoli, che ſono mez’ orna di Franconia, cauato. <lb/></s>
  <s xml:id="echoid-s100" xml:space="preserve">ne l aria, peſaua meno che con eſſa, vn’oncia e {3/10}.</s>
  <s xml:id="echoid-s101" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s102" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s103" xml:space="preserve">In verità che queſt’eſperienza mi pare molto palpabile.</s>
  <s xml:id="echoid-s104" xml:space="preserve">
<pb o="3" file="00009" n="9" rhead="_PRIMO._"/>
Parmitanto vera, che non vi ſia che replicar in contra-<lb/>rio.</s>
  <s xml:id="echoid-s105" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s106" xml:space="preserve">_Conte_. </s>
  <s xml:id="echoid-s107" xml:space="preserve">E pure vi è chi la nega in parte. </s>
  <s xml:id="echoid-s108" xml:space="preserve">Queſto è il Signor An-<lb/>tonio Deuſingio, Medico, e Filoſofo celeberimo, il qua-<lb/>le (come dice il medemo P. </s>
  <s xml:id="echoid-s109" xml:space="preserve">Scotti _nell’ Annotat. </s>
  <s xml:id="echoid-s110" xml:space="preserve">ſopra il detto_ <lb/>2. </s>
  <s xml:id="echoid-s111" xml:space="preserve">_Cap. </s>
  <s xml:id="echoid-s112" xml:space="preserve">è nel Lib_. </s>
  <s xml:id="echoid-s113" xml:space="preserve">4. </s>
  <s xml:id="echoid-s114" xml:space="preserve">_Cap_. </s>
  <s xml:id="echoid-s115" xml:space="preserve">4.) </s>
  <s xml:id="echoid-s116" xml:space="preserve">_nella ſua Seconda Diſquiſ. </s>
  <s xml:id="echoid-s117" xml:space="preserve">del Vacuo Set_. <lb/></s>
  <s xml:id="echoid-s118" xml:space="preserve">2. </s>
  <s xml:id="echoid-s119" xml:space="preserve">_Cap_. </s>
  <s xml:id="echoid-s120" xml:space="preserve">4. </s>
  <s xml:id="echoid-s121" xml:space="preserve">concede l’effetto, ma nega la cauſa. </s>
  <s xml:id="echoid-s122" xml:space="preserve">Concede <lb/>adunque, che il vaſo peſi meno ſenz aria, che con eſſa; </s>
  <s xml:id="echoid-s123" xml:space="preserve"><lb/>ma che queſto non naſca, perche l’aria ſe poſſi peſare in <lb/>modo alcuno nell’aria (perche l’aria nell’aria ne è graue, ne <lb/>leggiera;) </s>
  <s xml:id="echoid-s124" xml:space="preserve">ne che queſto effetto prouenga dall’aria, la qua-<lb/>le al vaſo aggiungeſſe peſo, è leuata lo diminuiſce; </s>
  <s xml:id="echoid-s125" xml:space="preserve">ma <lb/>perche leuata l’aria dal vaſo, quella che circonda il vaſo, è <lb/>fatta più craſſa, conſtipata, e denſa: </s>
  <s xml:id="echoid-s126" xml:space="preserve">e perciò il vaſo è reſo <lb/>più leggiero da queſta, di quello che era prima, quando <lb/>pieno d’aria, l’ambiente era meno denſa; </s>
  <s xml:id="echoid-s127" xml:space="preserve">al modo (ſoggiun-<lb/>ge egli) che _Nauis onuſta minùs altè mergitur in aqua Marina_, <lb/>_quam in fluuiali_.</s>
  <s xml:id="echoid-s128" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s129" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s130" xml:space="preserve">Si contenti Signor Ofredi, che anch’io applaudiſchi <lb/>all’inuentione del Signor Gerickio; </s>
  <s xml:id="echoid-s131" xml:space="preserve">e che ſe bene queſta non <lb/>ſolo viene impugnata dal Signor Deuſingio, ma anco da <lb/>altro valoroſiſſimo Matematico, ch’è il P. </s>
  <s xml:id="echoid-s132" xml:space="preserve">Paolo Caſati <lb/>Geſuita, è forſe da altri, ch’io non hò veduti, mi ſottoſcri-<lb/>ui al ſuo penſiero, è dichi, parermi che con queſt’ eſperien-<lb/>za ſi proui tanto ſenſibilmente il peſo dell’ aria, che nulla <lb/>più. </s>
  <s xml:id="echoid-s133" xml:space="preserve">E trala ſciando per hora il P. </s>
  <s xml:id="echoid-s134" xml:space="preserve">Caſati, mi ſia lecito dire <lb/>con ogni riuerenza, non mi parere, che il Signor Deuſin-<lb/>gio, e molti altri penetrino molto bene, come l’aria nell’-<lb/>aria non ſia nè graue, nè leggiera; </s>
  <s xml:id="echoid-s135" xml:space="preserve">poiche queſto non deue <lb/>intenderſi formalmente, ma quanto all’effetto ſolo del di-<lb/>ſcendere, ch’è il fine della grauità.</s>
  <s xml:id="echoid-s136" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s137" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s138" xml:space="preserve">Queſto ſuo aſſerto coſi in confuſo mi pare molto ardi-<lb/>to. </s>
  <s xml:id="echoid-s139" xml:space="preserve">In gratia ſpieghi più chiaramente li ſuoi ſenſi, per-<lb/>che mi paiono diametralmente oppoſti à quel comune aſ-<lb/>ſioma delle Scuole, che _Elementa in proprijs locis nec grauitant_, <lb/>_nec leuitant_.</s>
  <s xml:id="echoid-s140" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s141" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s142" xml:space="preserve">Se queſt’aſſioma comune ſarà d’altri inteſo diuerſa-<lb/>mente da quanto io dirò, dubito grandemente della ſua
<pb o="4" file="00010" n="10" rhead="_DIALOGO_"/>
verità. </s>
  <s xml:id="echoid-s143" xml:space="preserve">Ma per principiare a dichiararmi, mi dica Signor <lb/>Ofredi li è mai accaduto ritrouarſi in vna quantità di popo-<lb/>lo, è far forza per andar auanti, è non ſi poter muouer in <lb/>conto alcuno?</s>
  <s xml:id="echoid-s144" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s145" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s146" xml:space="preserve">Infinite volte.</s>
  <s xml:id="echoid-s147" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s148" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s149" xml:space="preserve">E perche V. </s>
  <s xml:id="echoid-s150" xml:space="preserve">S. </s>
  <s xml:id="echoid-s151" xml:space="preserve">non poteua caminar auanti, benche fa-<lb/>ceſſe tanta forza?</s>
  <s xml:id="echoid-s152" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s153" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s154" xml:space="preserve">Perche non poteuo andar auāti, ſe non ſpingeuo dal pro-<lb/>prio luogo, chi mi precedeua; </s>
  <s xml:id="echoid-s155" xml:space="preserve">mà queſti reſiſteuano al mio <lb/>ſpingere, ne ſi laſciauano muouere.</s>
  <s xml:id="echoid-s156" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s157" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s158" xml:space="preserve">Si che adunque V. </s>
  <s xml:id="echoid-s159" xml:space="preserve">S. </s>
  <s xml:id="echoid-s160" xml:space="preserve">formalmente ſpingeua; </s>
  <s xml:id="echoid-s161" xml:space="preserve">ſe bene <lb/>poi l’effetto, cioè l’andar auanti, era nullo. </s>
  <s xml:id="echoid-s162" xml:space="preserve">Tanto in vn cer-<lb/>to modo, auuiene nel caſo noſtro. </s>
  <s xml:id="echoid-s163" xml:space="preserve">L’àcqua nell’acqua, e l’a-<lb/>ria nell’aria grauitano, è s’affaticano (per così dire) formal-<lb/>mente per andar à baſſo; </s>
  <s xml:id="echoid-s164" xml:space="preserve">Ma perche non poſſono diſcende. <lb/></s>
  <s xml:id="echoid-s165" xml:space="preserve">re ſe non cacciano dal proprio luogo, e fanno ſalire altra ac-<lb/>qua, ò aria, al qual cacciamento, e ſalita queſta reſiſte con <lb/>egual momento, &amp; </s>
  <s xml:id="echoid-s166" xml:space="preserve">energia, &amp; </s>
  <s xml:id="echoid-s167" xml:space="preserve">anco con maggiore, (ſe l’ac-<lb/>qua d’alzarſi foſse per fortuna più graue;) </s>
  <s xml:id="echoid-s168" xml:space="preserve">da quì ne naſce, <lb/>che ſe bene la grauità opera attualmente, e formalmente, <lb/>non ne ſegua però l’effetto del diſcendere.</s>
  <s xml:id="echoid-s169" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s170" xml:space="preserve">_Conte_. </s>
  <s xml:id="echoid-s171" xml:space="preserve">Così è <gap/>mo. </s>
  <s xml:id="echoid-s172" xml:space="preserve">Vuole Signor Ofredi conoſcere che <lb/>così ſia? </s>
  <s xml:id="echoid-s173" xml:space="preserve">Vna portione di queſt’acqua, ò aria ſia reſa per <lb/>qualche accidente vn pochino meno denſa, e graue, sìche il <lb/>ſuo conato al diſcendere ceda in parte; </s>
  <s xml:id="echoid-s174" xml:space="preserve">vederà, che ſubito <lb/>ſarà ſpinta in sù da quell’altr’aria, ò acqua, la quale eſſendo <lb/>inalterata, conſerua il medemo conato, il quale eccede <lb/>quello della rarefatta. </s>
  <s xml:id="echoid-s175" xml:space="preserve">Al modo che, Signor Ofredi, ſe ſpin-<lb/>gendo lei nella calca per an dar auanti, li anteriori ſminui-<lb/>ranno in parte la loro reſiſtenza, &amp; </s>
  <s xml:id="echoid-s176" xml:space="preserve">il reſpingere, lei a pro-<lb/>portione dell’ecceſſo del ſuo ſpingere ſopra la reſiſtenza de <lb/>queſti, anderà auanti.</s>
  <s xml:id="echoid-s177" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s178" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s179" xml:space="preserve">Così è Signor Ofredi. </s>
  <s xml:id="echoid-s180" xml:space="preserve">Io credo che l’aria nell’aria, e l’ac-<lb/>qua nell’acqua grauitino beniſſimo formalmente, ma non <lb/>pregrauitino: </s>
  <s xml:id="echoid-s181" xml:space="preserve">e coſi non ſegua moto alcuno, ò ſceſa, quando <lb/>tutta l’acqua, ò aria ſia della medema grauità. </s>
  <s xml:id="echoid-s182" xml:space="preserve">Parimente <lb/>credo, che l’aria rachiuſa nel recipiente peſi, e leuatone par-<lb/>te, tanto meno peſi il rimanente; </s>
  <s xml:id="echoid-s183" xml:space="preserve">e queſto meno ſia quello,
<pb o="5" file="00011" n="11" rhead="_PRIMO_."/>
che peſaua già l’eſtratta, quando era nel recipiente. </s>
  <s xml:id="echoid-s184" xml:space="preserve">Onde ſe <lb/>il detto comune che _Elementa in proprijs locis nec grauitant, nec_ <lb/>_leuitant_, viene inteſo in ſenſo contrario alla preſente dot-<lb/>trina, io lo tengo aſſolutamente per falſo. </s>
  <s xml:id="echoid-s185" xml:space="preserve">Queſt’a ſſioma <lb/>però non mi pare d’Ariſtotile, il quale eſpreſſamente _nel_ <lb/>_Lib_. </s>
  <s xml:id="echoid-s186" xml:space="preserve">4. </s>
  <s xml:id="echoid-s187" xml:space="preserve">_de Cælo, Cap_. </s>
  <s xml:id="echoid-s188" xml:space="preserve">5. </s>
  <s xml:id="echoid-s189" xml:space="preserve">dice, che _Elementa omnia grauitatem ba-_ <lb/>_bent in ſuo loco, præter ignem_, ma è ſtato introdotto da alcu-<lb/>ni Peripatetici nelle ſcuole, non sò perche.</s>
  <s xml:id="echoid-s190" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s191" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s192" xml:space="preserve">Ma la cauſa, che aſſegna il Signor Deuſingio di queſt’ef-<lb/>fetto, non ſarà la vera? </s>
  <s xml:id="echoid-s193" xml:space="preserve">E pure viene da lui appoggiata ad <lb/>vn’ eſperienza tanto certa, quanto è che la naue carica <lb/>s’immerga più nell’ acqua del fiume, che in quella del <lb/>mare.</s>
  <s xml:id="echoid-s194" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s195" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s196" xml:space="preserve">Queſt’eſperienza è più che certa, Ma di eſſa non è già <lb/>la cauſa quella, che aſſegna il Signor Deuſingio; </s>
  <s xml:id="echoid-s197" xml:space="preserve">anzi par-<lb/>mi prima de lui Ariſtotile _nel Libro_ 2. </s>
  <s xml:id="echoid-s198" xml:space="preserve">_delle Meteore al test._ </s>
  <s xml:id="echoid-s199" xml:space="preserve">25. <lb/></s>
  <s xml:id="echoid-s200" xml:space="preserve">cioè perche l’acqua del Mare ſia più conſtipata, e denſa; </s>
  <s xml:id="echoid-s201" xml:space="preserve"><lb/>ma bene perche è più graue. </s>
  <s xml:id="echoid-s202" xml:space="preserve">Onde ſe bene è anco più con-<lb/>ſtipata, e denſa, queſta però non è la formale cagione di <lb/>quell’effetto, ma ſolo per accidente, in quanto che eſſen-<lb/>do più conſ@ipata e denſa, è anco più graue. </s>
  <s xml:id="echoid-s203" xml:space="preserve">La vera cauſa <lb/>adunque è, perche l’acqua del Mare e più g@aue<unsure/> di quella del-<lb/>li Fiumi.</s>
  <s xml:id="echoid-s204" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s205" xml:space="preserve">Mà acciò V. </s>
  <s xml:id="echoid-s206" xml:space="preserve">S. </s>
  <s xml:id="echoid-s207" xml:space="preserve">intenda meglio come camini queſta facen-<lb/>da, ſi riduchi a memoria _la Prop._ </s>
  <s xml:id="echoid-s208" xml:space="preserve">5. </s>
  <s xml:id="echoid-s209" xml:space="preserve">_del Lib._ </s>
  <s xml:id="echoid-s210" xml:space="preserve">1. </s>
  <s xml:id="echoid-s211" xml:space="preserve">_d’ Archimede, de_ <lb/>_Inſidentibus Aquæ_, che dice così_: </s>
  <s xml:id="echoid-s212" xml:space="preserve">Solidarum magnitudinum quæ-_ <lb/>_cunque fuerit leuior humido demiſſa in humidum in tantum demer-_ <lb/>_getur, vt tanta moles humidi quanta est moles demerſæ, habeat æ-_ <lb/>_qualem grauitatem cum tota magnitudin@_.</s>
  <s xml:id="echoid-s213" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s214" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s215" xml:space="preserve">Io me l’arricordo beniſſimo, poiche hora tengo <lb/>per le mani certe propoſitioni d’vn dottiſſimo Filoſofo del <lb/>Studio di Piſa, nomato il Signor Donato Roſſetti, il quale <lb/>_nella ſeconda_ pretende di dimoſtrare, che il concetto d’Ar-<lb/>chimede ſia falſo.</s>
  <s xml:id="echoid-s216" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s217" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s218" xml:space="preserve">Anch’io hò ſcorſo queſte ſue propoſitioni, le quali <lb/>non ci neceſſitano ad interrompere il filo del noſtro diſcor-<lb/>ſo; </s>
  <s xml:id="echoid-s219" xml:space="preserve">perche anco eſſendo vero quanto dice queſto Sig. </s>
  <s xml:id="echoid-s220" xml:space="preserve">nel <lb/>noſtro caſo ſarà tanto pocala fiſica differenza, che arreche,
<pb o="6" file="00012" n="12" rhead="_DIALOGO_"/>
rà certa poca aria, che ſi doueria intender congionta con <lb/>l’acqua, che potiamo ſupponer la ſola propoſitione d’Ar-<lb/>chimede. </s>
  <s xml:id="echoid-s221" xml:space="preserve">La quale ſtando in vigore, &amp; </s>
  <s xml:id="echoid-s222" xml:space="preserve">applicata al no <lb/>ſtro caſo della naue, perche peſa più, &amp; </s>
  <s xml:id="echoid-s223" xml:space="preserve">ha maggior mo-<lb/>mento l’acqua del Mare, che l’acqua del Fiume, ne ſe-<lb/>gue, che minor quantità di quella, che di queſta grauiti <lb/>quanto grauita tutta la naue: </s>
  <s xml:id="echoid-s224" xml:space="preserve">che perciò meno s’immer-<lb/>ge nella ſalſa, che nella dolce. </s>
  <s xml:id="echoid-s225" xml:space="preserve">Non hà adunque che fa-<lb/>re la maggior conſtipatione della ſalſa ſopra la dolce <lb/>circa l’immergerſi più la naue in queſta, che in quel-<lb/>la, ſe non in quanto la più conſtipata è anco più gra-<lb/>ue.</s>
  <s xml:id="echoid-s226" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s227" xml:space="preserve">_Conte_. </s>
  <s xml:id="echoid-s228" xml:space="preserve">Se il meno immergerſi la naue nell’acqua ſalſa, che nel-<lb/>la dolce, naſceſſe dalla maggior conſtipatione, ne ſegui-<lb/>rebbe, che ſuperata queſta da qualche forza, cioè ſpinta <lb/>la naue ſotto il liuello, che ha naturalmente, iui ſtaſſe, <lb/>anzi con difficoltà ſi cauaſſe. </s>
  <s xml:id="echoid-s229" xml:space="preserve">Mà ciò non ſuccede, per-<lb/>che remoſſa la cauſa ſpingente, naturalmente riaſc@n-<lb/>de.</s>
  <s xml:id="echoid-s230" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s231" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s232" xml:space="preserve">Io non vedo molto chiaro come V. </s>
  <s xml:id="echoid-s233" xml:space="preserve">S. </s>
  <s xml:id="echoid-s234" xml:space="preserve">inferiſchi queſta <lb/>ſequella.</s>
  <s xml:id="echoid-s235" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s236" xml:space="preserve">_Conte_. </s>
  <s xml:id="echoid-s237" xml:space="preserve">Se dal canale ou@ è la naue ſe rimouerà tutta l’acqua, la <lb/>naue li caccierà nel fango a proportione della ſua grauità, <lb/>c reſiſtenza del fango; </s>
  <s xml:id="echoid-s238" xml:space="preserve">la quale non naſce, che dalla ſua <lb/>conſtipatione, e denſità. </s>
  <s xml:id="echoid-s239" xml:space="preserve">Chi al peſo della naue n’aggiun-<lb/>gerà, ò maggiore, ò qualche forza ſpingente, la naue ſi <lb/>caccierà più nel fango; </s>
  <s xml:id="echoid-s240" xml:space="preserve">è doue ſarà ſpinta iui ſtarà; </s>
  <s xml:id="echoid-s241" xml:space="preserve">ne ſi le-<lb/>uerà che con gran fatica, perche il fango non reſiſte che <lb/>con la ſola conſtipatione. </s>
  <s xml:id="echoid-s242" xml:space="preserve">Tanto ſuccederebbe alla naue <lb/>poſta nell’acqua marina, quando queſta reſiſteſſe con la ſo-<lb/>la conſtipatione. </s>
  <s xml:id="echoid-s243" xml:space="preserve">Spinta la naue ſotto il natural liuello, già <lb/>la reſiſtenza della conſtipatione è vinta; </s>
  <s xml:id="echoid-s244" xml:space="preserve">onde non vi ſareb-<lb/>be cauſa, che reſpingeſſe la naue al luogo primiero (co-<lb/>me ſuccede remoſſa la cauſa ſpingente;) </s>
  <s xml:id="echoid-s245" xml:space="preserve">che viene reſpin-<lb/>ta in sù dal maggior momento dell’ acqua ſopra quel-<lb/>lo della naue, ſino a quel ſegno, oue queſti momenti ſi <lb/>pareggino.</s>
  <s xml:id="echoid-s246" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s247" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s248" xml:space="preserve">Aggiunga V. </s>
  <s xml:id="echoid-s249" xml:space="preserve">S. </s>
  <s xml:id="echoid-s250" xml:space="preserve">che quando l’immergerſi la naue me-
<pb o="7" file="00013" n="13" rhead="_PRIMO_."/>
mo nell’acqua ſalſa, che nella dolce naſceſſe dalla conſtipa-<lb/>tione, queſta reſiſterebbe tanto nell’andar a baſſo, quanto <lb/>nel venir di ſopra. </s>
  <s xml:id="echoid-s251" xml:space="preserve">Onde poſto, per eſempio, vn pezzo di <lb/>legno men graue in ſpecie nell’acqua, e ſalſa, e dolce, nel <lb/>fondo del mare, e del fiume, queſto nella ſalſa ò non ritor-<lb/>narebbe a galla, come impotente a ſuperare la conſtipatio-<lb/>ne; </s>
  <s xml:id="echoid-s252" xml:space="preserve">ò almeno ſalirebbe con maggior lentezza di quello ſa-<lb/>liſſe poſto nel fondo della dolce; </s>
  <s xml:id="echoid-s253" xml:space="preserve">eſſendo nella ſalſa mag. <lb/></s>
  <s xml:id="echoid-s254" xml:space="preserve">giore conſtipatione da ſuperare. </s>
  <s xml:id="echoid-s255" xml:space="preserve">E pure ſuccede in pratica <lb/>tutto il contrario; </s>
  <s xml:id="echoid-s256" xml:space="preserve">perche ſaliſſe con maggior velocità nella <lb/>ſalſa, che nella dolce. </s>
  <s xml:id="echoid-s257" xml:space="preserve">Perche eſſendo reſpinto in sù dal <lb/>maggior momento dell’acqua ſopra il ſuo proprio; </s>
  <s xml:id="echoid-s258" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s259" xml:space="preserve">eſ-<lb/>ſendo maggior il momento della ſalſa di quello della dol-<lb/>ce, opera anco quello più efficacemente; </s>
  <s xml:id="echoid-s260" xml:space="preserve">è così aſcende <lb/>con maggior velocità nella ſalſa, che nella dolce.</s>
  <s xml:id="echoid-s261" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s262" xml:space="preserve">Quanto però habbiamo detto, non è ſufficiente a render <lb/>la ragione, perche peſi meno il recipiente euacuato d’ aria, <lb/>che pieno d’eſſa; </s>
  <s xml:id="echoid-s263" xml:space="preserve">e che la differenza ſia il peſo di queſta; </s>
  <s xml:id="echoid-s264" xml:space="preserve">ma <lb/>per intiera intelligenza di ciò è neceſſaria vn altra propoſit. <lb/></s>
  <s xml:id="echoid-s265" xml:space="preserve">d’Archimede, che è _la ſettima del medemo Lib_. </s>
  <s xml:id="echoid-s266" xml:space="preserve">la quale dice <lb/>coſi. </s>
  <s xml:id="echoid-s267" xml:space="preserve">_Grauiora humido demiſſa in humidum ferrentur deorſum do-_ <lb/>_nec deſcendant &amp; </s>
  <s xml:id="echoid-s268" xml:space="preserve">erunt leuiora in humido tantum, quantum habet_ <lb/>_grauitas humidi habentis tantam molem, quanta eſt moles ſolidę ma-_ <lb/>_gnituainis_. </s>
  <s xml:id="echoid-s269" xml:space="preserve">Hora l’aria deue intenderſi nel noſtro caio per <lb/>queſto humido, ò fluido, nella quale poſto il vaſo otturato <lb/>pieno d’eſſa, l’aria ambiente ſottrae da quella mole com-<lb/>poſta della materia del vaſo, e dell’aria rachiuſa, tanto pe-<lb/>ſo, quanto è quello d’vna mole d’aria eguale a tutta quel-<lb/>la mole. </s>
  <s xml:id="echoid-s270" xml:space="preserve">Euacuato il vaſo, è manifeſto che ſi conſerua la <lb/>mole medema, alla quale pure ſi paragona la medema mo-<lb/>le d’aria ambiente, che pur leua dall’aggregato del vaſo, e ò <lb/>etere, ò altro, che ſi concepiſca riempirlo il medemo pe@o <lb/>di prima_:_ </s>
  <s xml:id="echoid-s271" xml:space="preserve">ſiche la differenza tra li due peſi non può eſſer <lb/>altra, che quanto peſaua l’aria rachiuſa prima nel vaſo. </s>
  <s xml:id="echoid-s272" xml:space="preserve"><lb/>Ma queſta verità s’anderà ſempre più manifeſtando.</s>
  <s xml:id="echoid-s273" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s274" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s275" xml:space="preserve">Tanto che V. </s>
  <s xml:id="echoid-s276" xml:space="preserve">S. </s>
  <s xml:id="echoid-s277" xml:space="preserve">penſa che la conſtipatione dell’ aria am-<lb/>biente il vaſo non habbia che fare?</s>
  <s xml:id="echoid-s278" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s279" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s280" xml:space="preserve">Non nel modo che dice il Signor Deuſingio. </s>
  <s xml:id="echoid-s281" xml:space="preserve">Hauerà
<pb o="8" file="00014" n="14" rhead="_DIALOGO_"/>
però che fare (quando vi ſia) perche eſſendo l’aria più con. <lb/></s>
  <s xml:id="echoid-s282" xml:space="preserve">ſtipata, ſarà anco più graue; </s>
  <s xml:id="echoid-s283" xml:space="preserve">onde ſe l’aria, nella quale ſi <lb/>peſa il vaſo dopò la ſua euacuatione ſarà più conſtipata, ſa-<lb/>rà anco più graue, &amp; </s>
  <s xml:id="echoid-s284" xml:space="preserve">in conſeguenza rendera il vaſo più leg-<lb/>giero. </s>
  <s xml:id="echoid-s285" xml:space="preserve">Ma non credo. </s>
  <s xml:id="echoid-s286" xml:space="preserve">che in queſto caſo ſia tanta la con-<lb/>ſtipatione dell’aria ambiente il vaſo, che differiſca da quel-<lb/>lo, ch’era innanzi l’euacuatione notabilment<unsure/>e. </s>
  <s xml:id="echoid-s287" xml:space="preserve">Ma quan-<lb/>do anco vi foſſe, non ſarebbe coſi in tutti li luoghi vicini, <lb/>è pure da per tutto ſi ritrouerà il medemo peſo del vaſo, <lb/>pur che non ſip eſi in aria alterata per accidente eſtrin-<lb/>ſeco.</s>
  <s xml:id="echoid-s288" xml:space="preserve"/>
</p>
<p style="it">
  <s xml:id="echoid-s289" xml:space="preserve">Conte. </s>
  <s xml:id="echoid-s290" xml:space="preserve">_V. </s>
  <s xml:id="echoid-s291" xml:space="preserve">Sig. </s>
  <s xml:id="echoid-s292" xml:space="preserve">ha toccato vna ragione contro la concluſione del_ <lb/>_Signor Deuſingio, che dice così_. </s>
  <s xml:id="echoid-s293" xml:space="preserve">Dum ergo circa recipient em <lb/>aere euacuatum aer ambiens denſior, compactiorque exiſtit, idem re-<lb/>cipientis pondus, lanci impoſitum aerem denſiorem ſibi circum ſtan-<lb/>tem minùs deprimit, quam ante exan@lationem deprimeret rariorem: <lb/></s>
  <s xml:id="echoid-s294" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s295" xml:space="preserve">interim lanx altera ad bilancem oppoſita, in aere verſatur non <lb/>æque compacto, ac is eſt, quiproximè recipientem circumſtat; </s>
  <s xml:id="echoid-s296" xml:space="preserve"><lb/>quare validiùs æquali pondere deprimitur.</s>
  <s xml:id="echoid-s297" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s298" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s299" xml:space="preserve">Faci gratia V. </s>
  <s xml:id="echoid-s300" xml:space="preserve">S. </s>
  <s xml:id="echoid-s301" xml:space="preserve">di fermarſi: </s>
  <s xml:id="echoid-s302" xml:space="preserve">adunque chi volterà la <lb/>bilancia, e ponerà la lance con il vaſo nel luogo doue <lb/>era quella con il peſo, e queſta nel ſuo, il vaſo peſerà <lb/>più, perche ſarà in aria meno denſa, e quello in aria più <lb/>denſa.</s>
  <s xml:id="echoid-s303" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s304" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s305" xml:space="preserve">Anch’a me pare queſta concluſione del Signor Deuſin-<lb/>gio inferita da molto deboli principi; </s>
  <s xml:id="echoid-s306" xml:space="preserve">peiche io non credo <lb/>che il Signor Gerickio, quando ha fatto queſt’eſperienza, e <lb/>due peſate diuerſe, le habbia fatte vna immediatamente <lb/>ſucceſſiua all’altra, &amp; </s>
  <s xml:id="echoid-s307" xml:space="preserve">habbia collocata la bilancia apuntino <lb/>nel medemo luogo. </s>
  <s xml:id="echoid-s308" xml:space="preserve">Io tengo di certo, che chi peſaſse prima <lb/>il vaſo pieno d’aria in quella ſtanza; </s>
  <s xml:id="echoid-s309" xml:space="preserve">in quella ſala li leuaſſe <lb/>l’aria, e poi anco dopò tempo conſiderabile, lo ripeſaſſe in <lb/>queſta ſtanza coſi euacuato, che tanto ſi trouarebbe la pre-<lb/>detta differenza.</s>
  <s xml:id="echoid-s310" xml:space="preserve"/>
</p>
<p style="it">
  <s xml:id="echoid-s311" xml:space="preserve">Conte. </s>
  <s xml:id="echoid-s312" xml:space="preserve">_Non credino loro Signori, che il Sig. </s>
  <s xml:id="echoid-s313" xml:space="preserve">Deuſingio non hab_ <lb/>_bia preuiſto queſti colpi, poiche ſe repara da eſſi così_. </s>
  <s xml:id="echoid-s314" xml:space="preserve">Dum vi-<lb/>trum exantlatum de loco in locum transfertur, is, qui derelicto ſpa-<lb/>@io vicinus eſt aer, in naturalem ſtatum per expanſionis nixum ſe
<pb o="9" file="00015" n="15" rhead="_PRIMO_."/>
denuò vindie at (veluti naue prouecta aſſurgunt illicò aquæ partes <lb/>paulò ante pondere nauis preſſæ.)</s>
  <s xml:id="echoid-s315" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s316" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s317" xml:space="preserve">In queſte vltime parole noto vna ſimilitudine, che non <lb/>mi par vera; </s>
  <s xml:id="echoid-s318" xml:space="preserve">ne mi pare che d’vn effetto s’aſſegni la vera cau-<lb/>ſa. </s>
  <s xml:id="echoid-s319" xml:space="preserve">Io hò ſempre creduto, che la na ue entri nell’acqua non <lb/>perche conſtipi le parti, che le ſoggiacino (le quali ò non <lb/>conſtipa, ò almeno pochiſſimo;) </s>
  <s xml:id="echoid-s320" xml:space="preserve">mà bene perche le ſpinga <lb/>dal proprio luogo, e facia ſalire; </s>
  <s xml:id="echoid-s321" xml:space="preserve">ſiche poi partita la naue, &amp; </s>
  <s xml:id="echoid-s322" xml:space="preserve"><lb/>andando innanzi, e ſpingendone, e ſolleuandone altre, le <lb/>già ſolleuate portate dalla natural grauità, diſcendino à <lb/>riempir quel luogo baſſo cauo, laſciato dalla naue. </s>
  <s xml:id="echoid-s323" xml:space="preserve">Ma pri-<lb/>ma che andiamo auanti, vorrei ſapere, ſe dichiara il modo, <lb/>nel quale, quando s euacua il vaſo, l’aria circonſtante, e vici-<lb/>na ſi conſtipa.</s>
  <s xml:id="echoid-s324" xml:space="preserve"/>
</p>
<p style="it">
  <s xml:id="echoid-s325" xml:space="preserve">Conte. </s>
  <s xml:id="echoid-s326" xml:space="preserve">_Poco di ſopra dell’antecedenti parole lo dichiara così_. <lb/></s>
  <s xml:id="echoid-s327" xml:space="preserve">Condenſatur autem imprimis aer, vbiproximè, coarctatione facta, <lb/>vim patitur, reliquo quantum fieri poteſt ſtatum ſuum naturalem <lb/>ſeruante; </s>
  <s xml:id="echoid-s328" xml:space="preserve">ſicque aer, qui vndequaque vitro viciniſſimus exiſtit, præ <lb/>reliquo diſtantiore per corporis intra vitrum contenti exantlatio-<lb/>nem, atque ætheris in ſpatium illius ingreſſum, quam maximè con-<lb/>denſatur.</s>
  <s xml:id="echoid-s329" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s330" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s331" xml:space="preserve">Tanto adunque che ſi condenſa perche eſce da eſſo la <lb/>parte più ſottile? </s>
  <s xml:id="echoid-s332" xml:space="preserve">Se così è, ftarà ſempre così, ſino che con <lb/>l’ingreſſo della medema, ò d’ altra materia ſottile come <lb/>quella, ſi tornino a dilatare le ſue parti. </s>
  <s xml:id="echoid-s333" xml:space="preserve">Se noi prenderemo <lb/>vn pugno d’erba, e la ſtringeremo, ò comprimeremo gen-<lb/>tilmente ſenza ch’eſchi fuori l’humore, aprendo la mano, e <lb/>ceſsando la compreſſione, l’erba con il ſuo elaterio ritorna-<lb/>rà ad hauere quell’eſpanſione, che haueua prima. </s>
  <s xml:id="echoid-s334" xml:space="preserve">Ma ſe re-<lb/>ſtringendola li faremo vſcir fuori l’humor più ſottile aperta <lb/>la mano, ſi dilatarà bene qualche poco per l’ingreſſo dell’a-<lb/>ria, che entrarà trà le foglie, la quale pur anco fù cacciata <lb/>dalla compresſione, ma non già come era prima. </s>
  <s xml:id="echoid-s335" xml:space="preserve">Se adun-<lb/>que l’aria ambiente il vaſo ſtà conſtipata per l’etere, che <lb/>da eſſa è vſcito, &amp; </s>
  <s xml:id="echoid-s336" xml:space="preserve">è entrato per li pori del vetro a riempir <lb/>il vaſo, non ſi dilatarà ſe non entra in eſſa, ò il medemo, ò <lb/>altro etere.</s>
  <s xml:id="echoid-s337" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s338" xml:space="preserve">_Conte_. </s>
  <s xml:id="echoid-s339" xml:space="preserve">Dice bene, ch’è dilatata appunto da altro etere, ſog-
<pb o="10" file="00016" n="16" rhead="DIALOCO"/>
_giungendo dopò la ſopradetta parenteſi_. </s>
  <s xml:id="echoid-s340" xml:space="preserve">Aetere aliunde, quo <lb/>nempe vitrum transfertur, inter eius particulas viciſſim ſubeunte. <lb/></s>
  <s xml:id="echoid-s341" xml:space="preserve">Sicque perpetuo circa vitrum ipſum, quocunque tranſlatum conden. </s>
  <s xml:id="echoid-s342" xml:space="preserve"><lb/>ſatio corporis proximè ambientis maior contingit.</s>
  <s xml:id="echoid-s343" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s344" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s345" xml:space="preserve">Gran carità di queſt’etere, laſciar l’aria, nella quale è, e <lb/>laſciar queſta conſtipata, e denſa, per rimediare alla conſti-<lb/>patione dell’aria vicina. </s>
  <s xml:id="echoid-s346" xml:space="preserve">Chilo ſpinge ad abbandonar la <lb/>propria aria, e laſciarla conſtipata, e denſa, per andar a ri-<lb/>mediar, egonfiar la più vicina? </s>
  <s xml:id="echoid-s347" xml:space="preserve">Che la prima aria circon-<lb/>ſtante il vaſo ſi cõſtipi per l’vſcita dell’etere, ſi potrebbe dire <lb/>eſſer ciò cauſato dal biſogno vniuerſale della natura, _ne de-_ <lb/>_tur vacuum,_ acciò quell’etere entraſſe a riempir il vaſo; </s>
  <s xml:id="echoid-s348" xml:space="preserve">ma <lb/>che poi il ſecondo etere eſchi dalla ſeconda aria per dilatar <lb/>la prima; </s>
  <s xml:id="echoid-s349" xml:space="preserve">il terzo dalla terza per dilatar la ſeconda; </s>
  <s xml:id="echoid-s350" xml:space="preserve">e così <lb/>quante volte ſi traſportarà il vaſo, non sò già vederne la cau <lb/>ſa. </s>
  <s xml:id="echoid-s351" xml:space="preserve">Già che ſecondo il Signor Deuſingio, ha da toccar à dell’a-<lb/>ria ad eſſer cõſtipata, ne ſtia pur la prima, perche _fruſtra fit per_ <lb/>_plura, quod poteſt fieri per pauciora_.</s>
  <s xml:id="echoid-s352" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s353" xml:space="preserve">_Conte_. </s>
  <s xml:id="echoid-s354" xml:space="preserve">Ma ſoggiunge ancora alcune parole, dalle quali pare, <lb/>che aſſegni altra cauſa. </s>
  <s xml:id="echoid-s355" xml:space="preserve">_Remotiore interim à violenta compa-_ <lb/>_ctione par inſitum quaſi elatere ſeipſum vindicante_.</s>
  <s xml:id="echoid-s356" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s357" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s358" xml:space="preserve">Se la conſtipatione ſi fa per la partenza dell’ etere, non <lb/>vi è elatere che tenga. </s>
  <s xml:id="echoid-s359" xml:space="preserve">E ſe hà la virtù elaſtica, perche non <lb/>poteua dilatarſi verſo l’ampiezza dell’aria, e non ſtar ſem-<lb/>pre in quella violenza?</s>
  <s xml:id="echoid-s360" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s361" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s362" xml:space="preserve">Ma io direi così contro queſta condenſatione. </s>
  <s xml:id="echoid-s363" xml:space="preserve">Non cre-<lb/>do già che quell’ aria ambiente il vaſo condenſata ſia pietre <lb/>da molino, ſi che non poſſi eſſer portata via dal vento. </s>
  <s xml:id="echoid-s364" xml:space="preserve">Soffi <lb/>queſto, e la porti via, ſi che ne ſucceda dell’ altra. </s>
  <s xml:id="echoid-s365" xml:space="preserve">Queſta <lb/>non ſarà condenſata, e pure peſando il vaſo, ſi ritrouarà il <lb/>medemo peſo.</s>
  <s xml:id="echoid-s366" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s367" xml:space="preserve">_Conte_. </s>
  <s xml:id="echoid-s368" xml:space="preserve">Anco à queſta obiettione procura de riſpondere in vna <lb/>lettera, che ſcriue al Padre Scotti, poſta da lui nel citato <lb/>_Libro_ 4.</s>
  <s xml:id="echoid-s369" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s370" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s371" xml:space="preserve">Non ſi curiamo di queſta riſpoſta, mà procuriamo d’ar-<lb/>recare vn paro d’eſperienze, che manifeſtamente dimoſtre-<lb/>ranno ſe queſt’aria ambiente ſia conſtipata, e denſa, ò della <lb/>medema natura dell’altra.</s>
  <s xml:id="echoid-s372" xml:space="preserve"/>
</p>
<pb o="11" file="00017" n="17" rhead="TRIMO."/>
<p>
  <s xml:id="echoid-s373" xml:space="preserve">Non v’è difficoltà, che l’aria più denſa cagiona maggior <lb/>gefrattione, fà apparire gli oggetti viſti per eſsa più grandi, <lb/>più vicini, e più alti. </s>
  <s xml:id="echoid-s374" xml:space="preserve">Quando queſt’aria foſſe più conſtipata <lb/>dell’altra, dourebbono tutti queſti effetti eſſer molto di-<lb/>uerſi in eſſa, che nell’altra vicina; </s>
  <s xml:id="echoid-s375" xml:space="preserve">perche la conſtipatione <lb/>ſarebbe molto notabile, mentre foſſe ſufficiente à render la <lb/>diuerſità d’vn’oncia e @ nel vaſo, di peſo.</s>
  <s xml:id="echoid-s376" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s377" xml:space="preserve">Secondariamente ècertiſſimo che il mezo impediſce il moto, e <lb/>quanto è più denſo, più impediſce. </s>
  <s xml:id="echoid-s378" xml:space="preserve">Onde facendo qualche eſ-<lb/>perienza di moto nell’aria @mbiente, e nell’altra, ſi proua-<lb/>rebbe gran differenza. </s>
  <s xml:id="echoid-s379" xml:space="preserve">E benche ſi poſſino penſar varii mo-<lb/>di d’eſpermentar ciò, io ſcieglierei vn pendolo, e l’eleuarei <lb/>nell’vna, &amp; </s>
  <s xml:id="echoid-s380" xml:space="preserve">altra aria alli medemi gradi, e notarei la gran-<lb/>dezza, e numero delle vibrationi. </s>
  <s xml:id="echoid-s381" xml:space="preserve">Certo che nell’aria più <lb/>denſa la decima vibratione, per eſsempio, non portarebbe il <lb/>mobile tant’alto, quanto la decima nella più rara; </s>
  <s xml:id="echoid-s382" xml:space="preserve">ne il nu-<lb/>mero delle vibrationi ſino alla quiete nella più denſa; </s>
  <s xml:id="echoid-s383" xml:space="preserve">ſareb-<lb/>be tanto quanto nella più rara. </s>
  <s xml:id="echoid-s384" xml:space="preserve">Altre eſperienze ſi potreb. <lb/></s>
  <s xml:id="echoid-s385" xml:space="preserve">bero fare per decider queſta contronerſia; </s>
  <s xml:id="echoid-s386" xml:space="preserve">mà baſtino que-<lb/>fte le quali ſe bene io non hò fatto, ſono però di parere, che <lb/>riuſcirebbero sfauorabili al Sig. </s>
  <s xml:id="echoid-s387" xml:space="preserve">Deuſingio.</s>
  <s xml:id="echoid-s388" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s389" xml:space="preserve">Mà in queſto punto mi naſce curioſità di ſa pere di che o-<lb/>pinione ſia il P. </s>
  <s xml:id="echoid-s390" xml:space="preserve">Scotti; </s>
  <s xml:id="echoid-s391" xml:space="preserve">ſe facia alcun rifleſſo ſopra queſte <lb/>dottrine del Signor Deuſingio, e ſe l’approui, ò rifiuti.</s>
  <s xml:id="echoid-s392" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s393" xml:space="preserve">_Conte_. </s>
  <s xml:id="echoid-s394" xml:space="preserve">E d’opinione totalmente contraria. </s>
  <s xml:id="echoid-s395" xml:space="preserve">Dice hauer prouato <lb/>nelli ſuoi _Iocoſerijs cent. </s>
  <s xml:id="echoid-s396" xml:space="preserve">3. </s>
  <s xml:id="echoid-s397" xml:space="preserve">prop. </s>
  <s xml:id="echoid-s398" xml:space="preserve">66. </s>
  <s xml:id="echoid-s399" xml:space="preserve">§. </s>
  <s xml:id="echoid-s400" xml:space="preserve">3. </s>
  <s xml:id="echoid-s401" xml:space="preserve">Aerem intra aerem gra-_ <lb/>_uitare, ſi vaſi includatur, &amp; </s>
  <s xml:id="echoid-s402" xml:space="preserve">à reliquo aere circumſtante diſconti-_ <lb/>_nuetur_.</s>
  <s xml:id="echoid-s403" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s404" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s405" xml:space="preserve">Se lui intende, che l’aria peſi nell’aria ſolamente quan-<lb/>do è rachiuſa nel vaſo, e ſeparata dall’altra, non mi pare che <lb/>intenda bene; </s>
  <s xml:id="echoid-s406" xml:space="preserve">perche io credo, ch’in tutti li modi peſi, anco <lb/>quando è libera, e meſcolata con l’altra.</s>
  <s xml:id="echoid-s407" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s408" xml:space="preserve">_Conte_. </s>
  <s xml:id="echoid-s409" xml:space="preserve">V’aggiunge di più vna conditione. </s>
  <s xml:id="echoid-s410" xml:space="preserve">_Dummodo aer inclusus_ <lb/>_vaſi, &amp; </s>
  <s xml:id="echoid-s411" xml:space="preserve">aer circumſtans in quo ſit ponderatio ſint eiuſdem denſitatis_ <lb/>_aut raritatis_.</s>
  <s xml:id="echoid-s412" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s413" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s414" xml:space="preserve">Queſta cautela non mi par molto propria. </s>
  <s xml:id="echoid-s415" xml:space="preserve">Io ſtimo, <lb/>che l’aria tanto nel vaſo, quanto fuori d’eſſo, tanto più den-
<pb o="12" file="00018" n="18" rhead="DIALOGO"/>
ſa, quanto più rara, poſta nell’altr’aria ſempre peſi. </s>
  <s xml:id="echoid-s416" xml:space="preserve">Se fuori <lb/>del vaſo, e più denſa, diſcenderà ſotto la meno denſa: </s>
  <s xml:id="echoid-s417" xml:space="preserve">ſe <lb/>meno denſa, hauerà il ſuo momento, ma ſuperato queſto <lb/>da quello della più denſa, ſirà ſpinta all’insù Se rachiuſa nel <lb/>vaſo, e ſarà più denſa, tutto il compoſto diſcenderà più fa-<lb/>cilmente. </s>
  <s xml:id="echoid-s418" xml:space="preserve">Se meno denſa, diſcenderà più difficilmente a <lb/>proportione della minor denſità.</s>
  <s xml:id="echoid-s419" xml:space="preserve"/>
</p>
<p style="it">
  <s xml:id="echoid-s420" xml:space="preserve">Conte. </s>
  <s xml:id="echoid-s421" xml:space="preserve">_Segue à dire_. </s>
  <s xml:id="echoid-s422" xml:space="preserve">Probauimus id à paritate ex aquis deſumpta: </s>
  <s xml:id="echoid-s423" xml:space="preserve">ta-<lb/>metſi enim aqua intra aqvam non grauitat, nec partes ſuperiores <lb/>premant inferiores ſibi ſubiectas vt probauimus fusè in Magia part. <lb/></s>
  <s xml:id="echoid-s424" xml:space="preserve">3. </s>
  <s xml:id="echoid-s425" xml:space="preserve">Libro 5. </s>
  <s xml:id="echoid-s426" xml:space="preserve">Sintag. </s>
  <s xml:id="echoid-s427" xml:space="preserve">2. </s>
  <s xml:id="echoid-s428" xml:space="preserve">Erot. </s>
  <s xml:id="echoid-s429" xml:space="preserve">3. </s>
  <s xml:id="echoid-s430" xml:space="preserve">tametſi vaſi includatur pars aquæ, hęc <lb/>grauitat intra aliam eiusdem rationis aquam.</s>
  <s xml:id="echoid-s431" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s432" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s433" xml:space="preserve">Che le parti ſuperiori dell’ acqua non premino l’infe-<lb/>riori, io lo tengo per falſiſſimo, come dirò particolarmence <lb/>a ſuo luogo, per non interrom pere hora il filo delli noſtri di-<lb/>ſcorſi. </s>
  <s xml:id="echoid-s434" xml:space="preserve">Coſi ſtimo anco falso che l’acqua nell’acqua non gra-<lb/>uiti, quando è libera, e meſcolata con l’altra, come già hab-<lb/>biamo detto. </s>
  <s xml:id="echoid-s435" xml:space="preserve">Che poi l’acqua rachiuſa nel vaſo grauiti, io lo <lb/>tengo per più che certo.</s>
  <s xml:id="echoid-s436" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s437" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s438" xml:space="preserve">Si potrebbe fare qualch’eſperienza, mediante la quale <lb/>ſi poteſſe moſtrare, che l’acqua meſcolata con l’acqua pe-<lb/>ſaſſe?</s>
  <s xml:id="echoid-s439" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s440" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s441" xml:space="preserve">Dell’acqua meſcolata con l’acqua in parte, credo che ſi <lb/>poſſi fare, ma della meſcolatain tutto a me non ne ſouuiene <lb/>alcuna, mà della meſcolata in parte, ne portarò vn paro, la <lb/>prima delle quali dimoſtrarà, ò che anco queſta peſi, ò che <lb/>non peſi la totalmente ſeparata. </s>
  <s xml:id="echoid-s442" xml:space="preserve">Prendaſi vn vaſo di mate-<lb/>ria più graue in ſpecie aſſai più dell’acqua, il quale habbia <lb/>vn coperchio, che ſe poſſi chiuder beniſſimo, ſi che chiuſo, <lb/>nulla vi poſſi entrare, almeno non acqua; </s>
  <s xml:id="echoid-s443" xml:space="preserve">ſe gl’alzi il coper-<lb/>chio, e s’impediſca che non lo poſſi chiudere; </s>
  <s xml:id="echoid-s444" xml:space="preserve">poi sommer. <lb/></s>
  <s xml:id="echoid-s445" xml:space="preserve">gaſi il vaſo totalmente nell’acqua: </s>
  <s xml:id="echoid-s446" xml:space="preserve">l’acqua, che riempirà il <lb/>vaſo, ſarà in parte ſcontinuata dall’altra, in parte nò Si peſi <lb/>il vaſo coſi poſto entro l’acqua, e ſe noti il peſo: </s>
  <s xml:id="echoid-s447" xml:space="preserve">poi il me-<lb/>demo vaſo pur pieno d’acqua s’otturi beniſſimo, e ſi torni a <lb/>peſare nell’ acqua; </s>
  <s xml:id="echoid-s448" xml:space="preserve">in queſto modo l’acqua rachiuſa ſarà <lb/>totalmente ſe parata dall’altra. </s>
  <s xml:id="echoid-s449" xml:space="preserve">Io tengo di certo che in tut-<lb/>ti doi li modi ſi ritrouarà il medemo peſo. </s>
  <s xml:id="echoid-s450" xml:space="preserve">Adunque ò non
<pb o="13" file="00019" n="19" rhead="TRIMO."/>
peſa la ſeparata totalmente, ò peſa anco quella in parte cõ-<lb/>tinua.</s>
  <s xml:id="echoid-s451" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s452" xml:space="preserve">L’altra eſperienza è tale, che con eſſa ſi potrà render ra-<lb/>gione di due eſſetti, che poſſono ſuccedere cotidianamente. <lb/></s>
  <s xml:id="echoid-s453" xml:space="preserve">Si prenda vn corpo duro galleggiante, e ſi collochi nell’ac-<lb/>qua, nella quale naturalmentes’immergerà ſino ad vn cer-<lb/>to ſegno; </s>
  <s xml:id="echoid-s454" xml:space="preserve">ſi procuri cacciarlo ſotto acqua maggiormente; </s>
  <s xml:id="echoid-s455" xml:space="preserve"><lb/>quanto più s’immergerà ſino alla total immerſione, ſe ſi te-<lb/>nirà coſi fermo, tanto maggio, fatica ſi farà, e ſi prouar@ <lb/>maggior forza fatta per riſſalire. </s>
  <s xml:id="echoid-s456" xml:space="preserve">Ma paſſata la total immer-<lb/>ſione, ſi ſpinga ſotto quanto ſi vuole, e ſi fermi in qual ſi <lb/>ſia luogo, ſempre ſi farà la medema fatica. </s>
  <s xml:id="echoid-s457" xml:space="preserve">Al contrario ſi pi-<lb/>gli vn bicchiere, ò vaſo, e con la bocca in giù così pieno d’-<lb/>aria ſi procuri ſpingerlo ſotto acqua, come s’è detto del gal-<lb/>leggiante; </s>
  <s xml:id="echoid-s458" xml:space="preserve">nel principio ſi prouarà vna tal difficoltà, che an-<lb/>derà creſcendo ſino alla total immerſione, la quale paſſata <lb/>andarà ſucceſſiuamente più ſcemando, ſecondo che il bic-<lb/>chiere s’andarà più ſommergendo.</s>
  <s xml:id="echoid-s459" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s460" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s461" xml:space="preserve">Sono queſti certamente due effetti molto volgari;</s>
  <s xml:id="echoid-s462" xml:space="preserve">ma io <lb/>così improuiſa mente non ſaprei rintraciarne le cagioni.</s>
  <s xml:id="echoid-s463" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s464" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s465" xml:space="preserve">Procurarò indagarle io. </s>
  <s xml:id="echoid-s466" xml:space="preserve">E prima per inueſtigar quella <lb/>della difficoltà, che ſempre ſi proua maggiore, quanto più <lb/>ſi procura immerger il galleggiante ſino alla total immer-<lb/>ſione, &amp;</s>
  <s xml:id="echoid-s467" xml:space="preserve">c. </s>
  <s xml:id="echoid-s468" xml:space="preserve">mi dica Signor Ofredi; </s>
  <s xml:id="echoid-s469" xml:space="preserve">ſe V. </s>
  <s xml:id="echoid-s470" xml:space="preserve">S. </s>
  <s xml:id="echoid-s471" xml:space="preserve">vorrà alzar, e te-<lb/>ner ſoſpeſa, vna mole d’acqua, non farà vna tal fatica, la <lb/>quale anco andarà ſempre più creſcendo, quanto più gran-<lb/>de ſarà la mole d’alzarſi, e quanto foſſe più graue?</s>
  <s xml:id="echoid-s472" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s473" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s474" xml:space="preserve">Certo sì.</s>
  <s xml:id="echoid-s475" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s476" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s477" xml:space="preserve">Adunque s’immagini V. </s>
  <s xml:id="echoid-s478" xml:space="preserve">S. </s>
  <s xml:id="echoid-s479" xml:space="preserve">che queſta ſia la maggior <lb/>difficoltà d immerger il galleggiante. </s>
  <s xml:id="echoid-s480" xml:space="preserve">Collocato queſto nel-<lb/>l’acqua, s’immerge quanto comporta il ſuo momento a, <lb/>pareggiare quello dell’acqua, che ſi alza, e con la ſua graui-<lb/>tà contraſta con la parte d’acqua già alzata per queſta ſua, <lb/>immerſione; </s>
  <s xml:id="echoid-s481" xml:space="preserve">ne noi ſentiamo il peſo di queſta: </s>
  <s xml:id="echoid-s482" xml:space="preserve">ma quando <lb/>lo ſpingiamo ſotto, faciamo ſalire vna tal quantità d’acqua, <lb/>la quale alzando noi, ſentiamo il ſuo peſo, il quale poi tan-<lb/>to più creſce, quanto più s’immerge il galleggiante, ſino al-<lb/>la total immerſione; </s>
  <s xml:id="echoid-s483" xml:space="preserve">quale ſuperata ſi ſente ſempre il mede-
<pb o="14" file="00020" n="20" rhead="DIALOGO"/>
mo peſo, perche ſempre ſi ſoſtiene alzata la medema quan-<lb/>tità d’acqua, che procura diſcendere.</s>
  <s xml:id="echoid-s484" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s485" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s486" xml:space="preserve">In gratia dichiarimeglio queſte dottrine.</s>
  <s xml:id="echoid-s487" xml:space="preserve"/>
</p>
  <figure>
    <image file="00020-01" xlink:href="http://echo.mpiwg-berlin.mpg.de/zogilib?fn=/permanent/library/9EXVCG1R/figures/00020-01"/>
  </figure>
<p>
  <s xml:id="echoid-s488" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s489" xml:space="preserve">Il galleggiante BHND, ſia collocato nell’acqua, nella <lb/>quale s’immerga da sè con la parte IHNK; </s>
  <s xml:id="echoid-s490" xml:space="preserve">è mamfeſto che, <lb/>nel vaſo AGPD, hauerà fatto alzar l’acqua ſopra il ſuo na-<lb/>turale liuello. </s>
  <s xml:id="echoid-s491" xml:space="preserve">Spingiamolo noi ſino che ſia totalmente im-<lb/>merſo, di modo che l’acqua ſia alzata ſino all’ AB; </s>
  <s xml:id="echoid-s492" xml:space="preserve">e mani-<lb/>feſto pure che l’acqua ſe ſarà ſempre andata più e più alzan-<lb/>do, e noi faremo ſempre maggior fatica dal principio ſino <lb/>alla total immerſione. </s>
  <s xml:id="echoid-s493" xml:space="preserve">Seguitiamo a ſpingerlo ſino al ſito v. <lb/></s>
  <s xml:id="echoid-s494" xml:space="preserve">g. </s>
  <s xml:id="echoid-s495" xml:space="preserve">HLON: </s>
  <s xml:id="echoid-s496" xml:space="preserve">ſecondo che lo ſpingeremo più ſotto, andarà <lb/>alzando ſucceſſiuamente altra acqua la quale andarà a riẽ-<lb/>pire lo ſpatio BHND laſciato da eſſo la quale hauerà il me-<lb/>demo liuello ABD. </s>
  <s xml:id="echoid-s497" xml:space="preserve">Onde ſe bene và ſempre alzando nuoua <lb/>acqua, non però ſopra il liuello di quella, che haueua alzata <lb/>nel ſito BHND, quando era totalmente immerſo;</s>
  <s xml:id="echoid-s498" xml:space="preserve">ne di que-<lb/>ſta ſentiamo il peſo, perche eſſa preme ſopra il galleggiante.</s>
  <s xml:id="echoid-s499" xml:space="preserve">
<pb o="15" file="00021" n="21" rhead="PRIMO."/>
Coſi ſpinto in L M P O, l’acqua alzata hauerà riempito <lb/>lo ſpatio HLON, ma non heuerà paſſato il medemo liuel-<lb/>lo A B D. </s>
  <s xml:id="echoid-s500" xml:space="preserve">L’acqua adunque alzata ſe bene è ſempre nuoua, <lb/>nulladimeno è ſempre al medemo liuello, el’alzata dopò la <lb/>total’immerſione preme ſopra il galleggiante. </s>
  <s xml:id="echoid-s501" xml:space="preserve">Che mera-<lb/>uiglia adunque ſe ſempre ſe facia la medema fatica?</s>
  <s xml:id="echoid-s502" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s503" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s504" xml:space="preserve">Io haurei creduto che nel ſito HLON, faceſſimo la fati-<lb/>ca corriſpondente all’acqua AFLB; </s>
  <s xml:id="echoid-s505" xml:space="preserve">e nel ſito LMPO, all’ac-<lb/>qua AGMB, la quale acqua procura diſcendere.</s>
  <s xml:id="echoid-s506" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s507" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s508" xml:space="preserve">Non Signore; </s>
  <s xml:id="echoid-s509" xml:space="preserve">perche nel ſito HLON, all’acqua AFLB, <lb/>corriſponde tutto il BLOD, che pure naturalmente vuol <lb/>diſcendere; </s>
  <s xml:id="echoid-s510" xml:space="preserve">e perche l’acque AEHB, BHND, ſono eguali, <lb/>hanno ancoeguali conati al diſcendere; </s>
  <s xml:id="echoid-s511" xml:space="preserve">onde chiſpinge nõ <lb/>ſente in conto alcuno il conato dell’ AEHB, come ſe non vi <lb/>foſſe, ma ſolo l’ecceſso della grauità dell’ acqua EFLH, <lb/>ſopra la grauità del galleggiante HLON. </s>
  <s xml:id="echoid-s512" xml:space="preserve">L’iſteſſo ſuccede-<lb/>rà nel ſito LMPO, che liconati dell’acque AFLB, BLOD, <lb/>ſaranno eguali.</s>
  <s xml:id="echoid-s513" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s514" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s515" xml:space="preserve">Certo che queſta, e non altra è la cauſa di queſto effetto; <lb/></s>
  <s xml:id="echoid-s516" xml:space="preserve">poiche anco quando cacciamo vna mano ſotto acqua, ſen-<lb/>tiamo vncerto peſo, e prouiamo vna certa fatica; </s>
  <s xml:id="echoid-s517" xml:space="preserve">il qual <lb/>peſo, nonè altro, che quello dell’acqua ſolleuara, &amp; </s>
  <s xml:id="echoid-s518" xml:space="preserve">alza-<lb/>ta, che fa forza per tornar nel ſuo luogo primiero.</s>
  <s xml:id="echoid-s519" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s520" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s521" xml:space="preserve">Già che V. </s>
  <s xml:id="echoid-s522" xml:space="preserve">S. </s>
  <s xml:id="echoid-s523" xml:space="preserve">ha toccato la fatica, che prouiamo nell’-<lb/>immerger la mano, auerta, che alcuno potrebbe ingannarſi <lb/>nel fare le ſopradette eſperienze, ſpingendo in giù il galleg-<lb/>giante con il braccio; </s>
  <s xml:id="echoid-s524" xml:space="preserve">perche quanto più lo ſpingiamo ſot-<lb/>to, tanto maggior quantità delbraccio ſi profonda, che fà <lb/>anco ſalire maggior quantità d’acqua, il cui peſo pure biſo-<lb/>gna, che ſentiamo. </s>
  <s xml:id="echoid-s525" xml:space="preserve">Biſogna adunque che ſi ſeruiamo a ſpin-<lb/>gere dicoſa coſi ſottile, che immergendoſi, poco facia ſali-<lb/>re l’acqua; </s>
  <s xml:id="echoid-s526" xml:space="preserve">e che quel poco non ſia da noi traſcurato.</s>
  <s xml:id="echoid-s527" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s528" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s529" xml:space="preserve">Hò inteſo. </s>
  <s xml:id="echoid-s530" xml:space="preserve">Andiamo al bicchiere, ò vaſo, nel quale certo <lb/>biſognarà oſſeruare la medema cautela.</s>
  <s xml:id="echoid-s531" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s532" xml:space="preserve">_Matem_ Quando adunque collochiamo nell’acqua il bicchiere <lb/>pieno d’aria, pur queſto s’immerge quanto comporta l’ag-<lb/>gregato della ſua grauità, e di quella dell’aria, che contiene, <lb/>e fa ſalire l’acqua proportionata. </s>
  <s xml:id="echoid-s533" xml:space="preserve">Quando poilo ſpingiamo,
<pb o="16" file="00022" n="22" rhead="DIALOGO"/>
pur fa ſalire maggior quantità d’acqua, il cui peſo ſentiamo <lb/>ſino alla total immerſione; </s>
  <s xml:id="echoid-s534" xml:space="preserve">ma perche queſta ſuperata, l’ac-<lb/>qua ſalendo, e fuori, e dentro il bicchiere, incontra l’aria <lb/>del bicchiere che li cede, e che ſi condenſa, perciò ſcema la <lb/>fatica; </s>
  <s xml:id="echoid-s535" xml:space="preserve">poiche l’acqua, ch’entra nel bicchiere, ſerue a fargli <lb/>acquiſtar maggior momento; </s>
  <s xml:id="echoid-s536" xml:space="preserve">perche in queſto modo ſi po-<lb/>ne nell’acqua non più vna mole d’aria, e di vetro, ma vna <lb/>mole d’acqua, d’aria, e di vetro. </s>
  <s xml:id="echoid-s537" xml:space="preserve">E perche quanto più ſi <lb/>ſpinge il bicchiere ſott’acqua, più queſt’aria ſi conſtipa ſin <lb/>ad vn certo ſegno, quindi è che ſi fa tanto minor fatica, cre-<lb/>ſcendo il momento del bicchiere. </s>
  <s xml:id="echoid-s538" xml:space="preserve">Auertaſſi però, che nel <lb/>principio I’aria ſi conſtipa pochiſſimo, ma più quanto più <lb/>s’immerge.</s>
  <s xml:id="echoid-s539" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s540" xml:space="preserve">L’acqua adunque, la qual entra nel bicchiere li fa acquiſtar <lb/>maggior momento. </s>
  <s xml:id="echoid-s541" xml:space="preserve">Ma queſta non è in parte congionta <lb/>conl’altra? </s>
  <s xml:id="echoid-s542" xml:space="preserve">Ecco adunque, che l’acqua nell’acqua congion-<lb/>ta con eſſa in parte, grauita.</s>
  <s xml:id="echoid-s543" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s544" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s545" xml:space="preserve">Io credo che V. </s>
  <s xml:id="echoid-s546" xml:space="preserve">S. </s>
  <s xml:id="echoid-s547" xml:space="preserve">sbagli di gran lunga, perche anch’io <lb/>hò letto queſta eſperienza nelli Dialogi Fiſici contro il mo-<lb/>to della Terra dell’inſigne Geometra, e diligente Filoſofo P. <lb/></s>
  <s xml:id="echoid-s548" xml:space="preserve">Honorato Fabri Geſuita, il quale dice ſucceder in pratica <lb/>tutto il contralio.</s>
  <s xml:id="echoid-s549" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s550" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s551" xml:space="preserve">Adeſſo cercarò queſto Libro, e vedremo quello, che <lb/>dice. </s>
  <s xml:id="echoid-s552" xml:space="preserve">Eccolo, Ritroui queſto luogo.</s>
  <s xml:id="echoid-s553" xml:space="preserve"/>
</p>
<p style="it">
  <s xml:id="echoid-s554" xml:space="preserve">Ofred. </s>
  <s xml:id="echoid-s555" xml:space="preserve">_Hor hora. </s>
  <s xml:id="echoid-s556" xml:space="preserve">Ecco che nel_ Dialogo 3-pag. </s>
  <s xml:id="echoid-s557" xml:space="preserve">95. </s>
  <s xml:id="echoid-s558" xml:space="preserve">dice. </s>
  <s xml:id="echoid-s559" xml:space="preserve">sit v. </s>
  <s xml:id="echoid-s560" xml:space="preserve">g. </s>
  <s xml:id="echoid-s561" xml:space="preserve">scy-<lb/>pbus vacuus ſecundum perpendiculum in acquam immerſus, ore pre-<lb/>uio, ita vt nihil prorſus aeris ante in ſcypho contenti auolare poſſit; <lb/></s>
  <s xml:id="echoid-s562" xml:space="preserve">baud dubie, quo profundius immergitur, maior vis ſurſum illum ex-<lb/>trudens ipſo tactu ſentitur; </s>
  <s xml:id="echoid-s563" xml:space="preserve">nempe totus aquæ ſuperpoſitæ cylindrus, <lb/>cuius baſis ori vaſis, ſeu ſcyphi circiter æqualis est, in aera ſcypho <lb/>contentum grauitat, magis autem, cylindrus altior.</s>
  <s xml:id="echoid-s564" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s565" xml:space="preserve">_Cont_. </s>
  <s xml:id="echoid-s566" xml:space="preserve">Non sò ſe da queſte parole ſe poſſi dedure che intenda del <lb/>bicchiere immerſo ſino alla total immerſione, o dopò.</s>
  <s xml:id="echoid-s567" xml:space="preserve"/>
</p>
<p style="it">
  <s xml:id="echoid-s568" xml:space="preserve">Ofred. </s>
  <s xml:id="echoid-s569" xml:space="preserve">_Fa che Agoſtino vno delli interlocutori, ſoggiunga_. </s>
  <s xml:id="echoid-s570" xml:space="preserve">Igitur <lb/>ſiprædictus ſcyphus aquæ immergatur, vt primum vno palmo à <lb/>ſuprema ſuperficie aquę diſtet, ac aeinde profundius immegatur, <lb/>ita vt diſtet ab eadem ſuperſicie duobus palmis, dupla tunc erit vis <lb/>grauitationis.</s>
  <s xml:id="echoid-s571" xml:space="preserve"/>
</p>
<pb o="17" file="00023" n="23" rhead="PRIMO."/>
<p>
  <s xml:id="echoid-s572" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s573" xml:space="preserve">Io non voglio inueſtigarein che ſenſo habbia parlato <lb/>ilP. </s>
  <s xml:id="echoid-s574" xml:space="preserve">Fabri. </s>
  <s xml:id="echoid-s575" xml:space="preserve">Sò bene, che hauendo io immerſo più volte, ebic-<lb/>chieri, e altri vaſi, non hò eſperimentato dopò la total im-<lb/>merſione, maggiori conati a riſalire, ma bene mi ſono par-<lb/>ſi minori, ſe bene molto poco, perche molto poco, in poca <lb/>diſceſa, e in vaſi piccioli, in poca quantità, l’aria ſi conſtipa; <lb/></s>
  <s xml:id="echoid-s576" xml:space="preserve">e poca è l’acqua che entra nel vaſo. </s>
  <s xml:id="echoid-s577" xml:space="preserve">Ma però chi diligente-<lb/>mente tentara queſt’ eſperienza, ſi potrà render certo di <lb/>queſta curioſità.</s>
  <s xml:id="echoid-s578" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s579" xml:space="preserve">Prenda ſi vn vaſo grande di vetro, piombo ò altra materia, &amp; </s>
  <s xml:id="echoid-s580" xml:space="preserve"><lb/>acciò diſcenda, ſe gl’attacchi dalla parte della bocca peſo a <lb/>ſufficienza, e dalla parte di ſopra ſi leghi con funicella fatta <lb/>diſetole di cauallo, le quali per eſſer ordinariamente della <lb/>medema grauità in ſpecie in circa con l’acqua comune, <lb/>s’adoprano comunemente da quelli, che peſano le coſe <lb/>graui nell’acqua, perche quella quantità d’eſſe, che ſe im-<lb/>merge, non altera la grauità della coſa peſata; </s>
  <s xml:id="echoid-s581" xml:space="preserve">poi ſe fa-<lb/>cia diſcendere con la bocca all’ingiù in vn’ acqua aſſai pro-<lb/>fonda, come ſarebbe in vn pozzo, ſino che ſia totalmente <lb/>immerſo, Fatto queſto s’attacchi ad vna ſtadera, ò bilan-<lb/>cia, come ſi ſuol fare, e ſi noti il ſuo peſo, che ſarà quanto <lb/>importa tutto il vaſo con l’aria, pcſi attaccati, e funicella, <lb/>che ſarà ſopra I’acqua, hauendo anco riguardo alla differen-<lb/>za, che poteſſe cagionare la parte della funicella, che s’im-<lb/>mergeſſe, quando queſta non foſſe preciſamente della me-<lb/>dema grauità ſpecifica dell’acqua. </s>
  <s xml:id="echoid-s582" xml:space="preserve">Fatto queſto peſo, ſi laſci <lb/>diſcendere il vaſo più, e più nell’acqua quanto ſi vuole; </s>
  <s xml:id="echoid-s583" xml:space="preserve">poi-<lb/>che ſe ſaranno certe le noſtre dottrine, quanto più ſarà di-<lb/>ſceſo nell’acqua, ſe ſi ripeſarà con li predetti riguardi, e cau-<lb/>tele, ſempre più ſi trouarà maggior peſo. </s>
  <s xml:id="echoid-s584" xml:space="preserve">Perche entrando <lb/>nel vaſo maggior quantità d’ acqua, quanto più il vaſo di-<lb/>ſcende, queſta li farà anco acquiſtar maggior momento. </s>
  <s xml:id="echoid-s585" xml:space="preserve">Se <lb/>adunque più profondato il vaſo ha ſempre maggior mo-<lb/>mento, chi in quel luogo li leuaſſe li peſi attaccati, mentre <lb/>queſti in tutti li luoghi hanno nell’acqua il medemo mo-<lb/>mento, reſtarebbe il vaſo con l’aria con maggior momento. <lb/></s>
  <s xml:id="echoid-s586" xml:space="preserve">Onde ch@lo teneſſe acciò non riſaliſce ſpinto insu dall’ac-<lb/>qua, farebbe minor fatica; </s>
  <s xml:id="echoid-s587" xml:space="preserve">c tanto più minore, quanto più
<pb o="18" file="00024" n="24" rhead="DIALOGO"/>
il vaſo foſſe profondato. </s>
  <s xml:id="echoid-s588" xml:space="preserve">Molto però habbiamo digredito. <lb/></s>
  <s xml:id="echoid-s589" xml:space="preserve">Ritorniamo onde habbiamo laſciato.</s>
  <s xml:id="echoid-s590" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s591" xml:space="preserve">_Conte_. </s>
  <s xml:id="echoid-s592" xml:space="preserve">Io adunque in quel propoſito direi così. </s>
  <s xml:id="echoid-s593" xml:space="preserve">Non sò vedere <lb/>perche vna coſa più leggiera in ſpecie dell’ acqua, habbia in <lb/>eſſa à grauitare, e nõ vna tanto graue in ſpecie quanto è eſſa, <lb/>qual’e la medema acqua.</s>
  <s xml:id="echoid-s594" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s595" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s596" xml:space="preserve">Pare certo irragioneuole. </s>
  <s xml:id="echoid-s597" xml:space="preserve">Ma qual’è queſta coſa?</s>
  <s xml:id="echoid-s598" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s599" xml:space="preserve">_Conte_. </s>
  <s xml:id="echoid-s600" xml:space="preserve">Queſt’è l’aria. </s>
  <s xml:id="echoid-s601" xml:space="preserve">Et il modo d’eſperimentar ciò ne ſara <lb/>ſomminiſtrato dal recipiente del Signor Gerickio. </s>
  <s xml:id="echoid-s602" xml:space="preserve">Pren-<lb/>daſi queſto, e prima d’euacuarlo ſi ſommerga totalmente <lb/>nell’acqua; </s>
  <s xml:id="echoid-s603" xml:space="preserve">ſe non baſta il ſuo peſo, aggiungendone a ſuffi-<lb/>cienza; </s>
  <s xml:id="echoid-s604" xml:space="preserve">poi ſi peſi così nell’acqua ogni coſa. </s>
  <s xml:id="echoid-s605" xml:space="preserve">Cauato dall’-<lb/>acqua ſi leui l’aria, come ſogliono praticare, e ſi torni a ſom-<lb/>mergere nell’acqua, e ripeſare. </s>
  <s xml:id="echoid-s606" xml:space="preserve">Io ſono ſicuriſſimo. </s>
  <s xml:id="echoid-s607" xml:space="preserve">che ſi <lb/>trouarà peſar meno queſta ſecõda volta della prima oncie 1. <lb/></s>
  <s xml:id="echoid-s608" xml:space="preserve">{3/10}. </s>
  <s xml:id="echoid-s609" xml:space="preserve">E la ragione è queſta. </s>
  <s xml:id="echoid-s610" xml:space="preserve">In tutte due l’immerſioni l’acqua <lb/>cacciata, &amp; </s>
  <s xml:id="echoid-s611" xml:space="preserve">alzata è ſempre la medema eſſendo anco la me-<lb/>dema la mole del vaſo. </s>
  <s xml:id="echoid-s612" xml:space="preserve">E perche il vaſo nell’acqua è tanto <lb/>meno graue, quanto peſa vna mole d’acqua ad eſſo eguale; </s>
  <s xml:id="echoid-s613" xml:space="preserve"><lb/>e la prima volta ſi faceua la ſottratione da vn compoſto di <lb/>vetro, &amp; </s>
  <s xml:id="echoid-s614" xml:space="preserve">aria con li peſi attaccati, e la ſeconda da vn compo-<lb/>ſto di queſti, e d’etere, ò di vacuo; </s>
  <s xml:id="echoid-s615" xml:space="preserve">ſarà più leggiero la ſe-<lb/>conda volta, che la prima. </s>
  <s xml:id="echoid-s616" xml:space="preserve">Adunque con queſt’eſperienza <lb/>ſi prouarà euidentemente, che l’aria rachiuſa nel vaſo, e pe-<lb/>ſi nell’acqua, e quanto. </s>
  <s xml:id="echoid-s617" xml:space="preserve">Se adunque l’aria nell’acqua più <lb/>graue d’eſſa, grauita, perche non douerà grauitare nell’a-<lb/>ria medema più leggiera dell’acqua? </s>
  <s xml:id="echoid-s618" xml:space="preserve">Perche l’acqua più <lb/>graue dell’ aria non douerà grauitare nella medema ac-<lb/>qua?</s>
  <s xml:id="echoid-s619" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s620" xml:space="preserve">Quanto habbiamo detto dell’aria riſpetto all’acqua, potreſſi-<lb/>mo dire v. </s>
  <s xml:id="echoid-s621" xml:space="preserve">g. </s>
  <s xml:id="echoid-s622" xml:space="preserve">dell’acqua dolce riſpetto della ſalſa. </s>
  <s xml:id="echoid-s623" xml:space="preserve">Se il vaſo <lb/>prima ripieno d’acqua dolce beniſſimo otturato, e poi ripie-<lb/>no d’aria. </s>
  <s xml:id="echoid-s624" xml:space="preserve">pur beniſſimo otturato, ſi peſara nella ſalſa certo <lb/>che la differenza ſara quanto peſa più l’acqua dolce nella <lb/>ſalſa, di quello peſi l’aria. </s>
  <s xml:id="echoid-s625" xml:space="preserve">Se adunque queſta peſa nella ſal-<lb/>ſa, perche non peſarà nella dolce?</s>
  <s xml:id="echoid-s626" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s627" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s628" xml:space="preserve">Quando ſuccedeſſero in pratica, mi paiono eſperienze
<pb o="19" file="00025" n="25" rhead="PRIMO."/>
molto conuincenti, e proprie. </s>
  <s xml:id="echoid-s629" xml:space="preserve">Qui certo non viſarebbe la <lb/>maggior conſtipatione, alla quale poteſſe ricorrere il Sig. <lb/></s>
  <s xml:id="echoid-s630" xml:space="preserve">Deuſingio.</s>
  <s xml:id="echoid-s631" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s632" xml:space="preserve">_Conte_. </s>
  <s xml:id="echoid-s633" xml:space="preserve">Manon ſolo coll’immergerſi totalmente il vaſo, ò reci-<lb/>piente ſi potrebbe conoſcere il peſo dell’aria nell’acqua, ma <lb/>anco con il ponerlo ſimplicemente in eſſa à galleggiare. </s>
  <s xml:id="echoid-s634" xml:space="preserve">Già <lb/>habbiamo per la citata _prop. </s>
  <s xml:id="echoid-s635" xml:space="preserve">5. </s>
  <s xml:id="echoid-s636" xml:space="preserve">d’ Archimede_, che vna coſa più <lb/>leggiera dell’humido, poſta in quello, s’immerge ſino che <lb/>tant’humido quant’è la parte immerſa peſi come tutto quel <lb/>corpo. </s>
  <s xml:id="echoid-s637" xml:space="preserve">Hora poſto il recipiente pieno d’aria nell’acqua, si <lb/>immergerà ſino ad’vn certo ſegno. </s>
  <s xml:id="echoid-s638" xml:space="preserve">S’euacui, e ſi reponghi <lb/>nell’acqua. </s>
  <s xml:id="echoid-s639" xml:space="preserve">Io ſono ſicuriſſimo, che non s’immergerà tan-<lb/>to quanto prima, ma vn poco meno: </s>
  <s xml:id="echoid-s640" xml:space="preserve">e quel meno diligen-<lb/>temente oſſeruato, darà a conoſcere il peſo dell’aria eſtrat-<lb/>ta, e che queſta grauitaſſe nell’acqua.</s>
  <s xml:id="echoid-s641" xml:space="preserve"/>
</p>
  <figure>
    <image file="00025-01" xlink:href="http://echo.mpiwg-berlin.mpg.de/zogilib?fn=/permanent/library/9EXVCG1R/figures/00025-01"/>
  </figure>
<p>
  <s xml:id="echoid-s642" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s643" xml:space="preserve">Che queſte eſperienze doueſſero <lb/>ſuccedere in pratica, io non ne hò du-<lb/>bio alcuno. </s>
  <s xml:id="echoid-s644" xml:space="preserve">Ma lei Sig. </s>
  <s xml:id="echoid-s645" xml:space="preserve">Ofredi, ſe per <lb/>ſorte n’ha qualche ſcrupolo, apra l’eru-<lb/>ditiſſimo Libro _de Compo. </s>
  <s xml:id="echoid-s646" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s647" xml:space="preserve">Reſol. </s>
  <s xml:id="echoid-s648" xml:space="preserve">Ma-_ <lb/>_tem_. </s>
  <s xml:id="echoid-s649" xml:space="preserve">del nobiliſſimo Signor Carlo Ri-<lb/>naldini noſtro comune amico, Geome-<lb/>tra inſigne, e Filoſofo Primario di que-<lb/>ſto Studio, &amp; </s>
  <s xml:id="echoid-s650" xml:space="preserve">alla _pagina_ 179. </s>
  <s xml:id="echoid-s651" xml:space="preserve">ritrouarà <lb/>vn eſperienza da eſſo fatta più volte, <lb/>come mi ha detto a bocca, che io bre-<lb/>uemente le deſcriuerò. </s>
  <s xml:id="echoid-s652" xml:space="preserve">ABC, è vn’ am. <lb/></s>
  <s xml:id="echoid-s653" xml:space="preserve">polla di vetro con il ſuo collo aſſai più <lb/>lungo d’vn braccio, &amp; </s>
  <s xml:id="echoid-s654" xml:space="preserve">vn quarto, la <lb/>quale riempita d’argento viuo, &amp; </s>
  <s xml:id="echoid-s655" xml:space="preserve">ot. </s>
  <s xml:id="echoid-s656" xml:space="preserve"><lb/>turata la bocca A con il dito, s’im-<lb/>merge in vn vaſo pieno di detto argẽ-<lb/>to: </s>
  <s xml:id="echoid-s657" xml:space="preserve">leuando poi il dito, l’argento viuo <lb/>diſcenderà ſino all’F, di modo che A F, <lb/>ſia vn braccio. </s>
  <s xml:id="echoid-s658" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s659" xml:space="preserve">vn quarto, come ſup <lb/>põgo eſſer noto a V. </s>
  <s xml:id="echoid-s660" xml:space="preserve">S. </s>
  <s xml:id="echoid-s661" xml:space="preserve">per la tãto fa. </s>
  <s xml:id="echoid-s662" xml:space="preserve"><lb/>moſa eſperiẽza del tubo Torricellia-<lb/>no. </s>
  <s xml:id="echoid-s663" xml:space="preserve">Fatto ciò, la medema bocca A, coſi <lb/>immerſa s’otturi, e leghi beniſſimo cõ
<pb o="20" file="00026" n="26" rhead="_DIALOGO_"/>
vna, ò più membrane di veſcica di Porco; </s>
  <s xml:id="echoid-s664" xml:space="preserve">dimodo che leua-<lb/>ta l’ampolla dall’argento nõ li poſſi entrarl’aria. </s>
  <s xml:id="echoid-s665" xml:space="preserve">Poi ſe pon-<lb/>ghi queſt’ampolla nell’acqua, alla quale per eſſer più graue <lb/>in ſpecie d’eſſa acqua, ſe gl’attacchi vna, ò più veſciche, acciò <lb/>non ſi ſommerga totalmente, ma galleggi con la particella <lb/>v. </s>
  <s xml:id="echoid-s666" xml:space="preserve">g. </s>
  <s xml:id="echoid-s667" xml:space="preserve">AE, che ſe noti eſquiſitamente. </s>
  <s xml:id="echoid-s668" xml:space="preserve">Poi con vn ſtilletto ſi <lb/>fori diligẽtemente la veſcica A, ſi che per il buccolino fatto <lb/>entri l’aria. </s>
  <s xml:id="echoid-s669" xml:space="preserve">Si vedrà diſcender più, l’ampolla, v. </s>
  <s xml:id="echoid-s670" xml:space="preserve">g. </s>
  <s xml:id="echoid-s671" xml:space="preserve">ſino al K, <lb/>La parte KE, dimoſtrerà il peſo dell’aria, che ſarà entrata <lb/>nell’ampolla.</s>
  <s xml:id="echoid-s672" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s673" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s674" xml:space="preserve">O che bella eſperienza! Ma il Gallileo è d’opinione in <lb/>quel ſuo ammirabile trattato delli galleggianti, che l’aria <lb/>nell’acqua non grauitiin conto alcuno. </s>
  <s xml:id="echoid-s675" xml:space="preserve">Onde ſe V.</s>
  <s xml:id="echoid-s676" xml:space="preserve">S. </s>
  <s xml:id="echoid-s677" xml:space="preserve">dice de <lb/>sì, contraria certo alla ſua dottrina.</s>
  <s xml:id="echoid-s678" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s679" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s680" xml:space="preserve">Io ſtimo che l’aria peſi nell’ a cqua, perche io la tengo <lb/>per corpo graue, come pure è reputata dal Galileo mede-<lb/>mo; </s>
  <s xml:id="echoid-s681" xml:space="preserve">onde eſſendo tale, deue grauitare da per tutto. </s>
  <s xml:id="echoid-s682" xml:space="preserve">Ma il <lb/>Galileo porta ragione, ò eſperienza alcuna che l’aria nell’ac-<lb/>qua non grauiti?</s>
  <s xml:id="echoid-s683" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s684" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s685" xml:space="preserve">Nò Sig. </s>
  <s xml:id="echoid-s686" xml:space="preserve">Solo lo ſuppone come coſa nota, è triuialiſſima <lb/>_a carte_ 42. </s>
  <s xml:id="echoid-s687" xml:space="preserve">oue ricerca che groſſezza puole hauere vna lami-<lb/>netta di qual ſi ſia materia più graue in ſpecie dell’ acqua. <lb/></s>
  <s xml:id="echoid-s688" xml:space="preserve">acciò collocata leggiermente ſopra eſſa non s’immerga, di-<lb/>ce, che la laminetta IS, nel ſuo ſchema, entra nell’ acqua, <lb/>che ſe gl’alza ſopra facendo li arginetti BC, AI, li quali con-<lb/>tengono vna foſſarella piena d’aria, della quale, e della lami-<lb/>netta ſi fà vn prilma AS. </s>
  <s xml:id="echoid-s689" xml:space="preserve">Hora dice che queſt’ aggregato, il <lb/>quale hà tanto momento, quant’è quello d’vna mole d’ac-<lb/>qua ad eſſo eguale, ha tanta grauità, quanta è quella della <lb/>ſola laminetta IS, _auuenga che_, dice egli, _la mole dell’ aria AC_, <lb/>_non cresca, ò diminuiſca la grauità della mole IS._ </s>
  <s xml:id="echoid-s690" xml:space="preserve">Il medemo da <lb/>eſſo viene aſſunto come coſa nota nella Propoſit. </s>
  <s xml:id="echoid-s691" xml:space="preserve">generale, <lb/>che ſegue _à carte_ 43. </s>
  <s xml:id="echoid-s692" xml:space="preserve">Onde ſe queſti ſuppoſti non ſono veri, <lb/>anco le dette propoſitioni ſaranno mancheuoli.</s>
  <s xml:id="echoid-s693" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s694" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s695" xml:space="preserve">Certoche eſſendo coſi, comerealmente è, e queſta, &amp; </s>
  <s xml:id="echoid-s696" xml:space="preserve"><lb/>altre ſue propoſitioni, nelle quali ſuppone queſta coſa, ſa-<lb/>ranno difettoſe in rigor geometrico; </s>
  <s xml:id="echoid-s697" xml:space="preserve">poiche in realtà, AS, <lb/>è vn’aggregato di due corpigraui; </s>
  <s xml:id="echoid-s698" xml:space="preserve">e coſi l’acqua eguale al
<pb o="21" file="00027" n="27" rhead="_PRIMO_"/>
priſma AS, deue peſare quanto peſano tutte due aſſiemc. <lb/></s>
  <s xml:id="echoid-s699" xml:space="preserve">Nè il modo di ritrouare l’altezza delli arginetti BC, AI, ſarà <lb/>totalmente quello, che inſegna il Galileo.</s>
  <s xml:id="echoid-s700" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s701" xml:space="preserve">_Ofred. </s>
  <s xml:id="echoid-s702" xml:space="preserve">Quod parum diſtat nibil diſtare videtur,_ e _parum pro nibilo repu-_ <lb/>_tatur_. </s>
  <s xml:id="echoid-s703" xml:space="preserve">Onde anco quando vi ſia qualche varieta, queſta ſarà <lb/>tanto poca, che nulla più; </s>
  <s xml:id="echoid-s704" xml:space="preserve">poiche quanto può peſare vn po-<lb/>chino d’aria, quant’è il priſma AC?</s>
  <s xml:id="echoid-s705" xml:space="preserve"/>
</p>
  <figure>
    <image file="00027-01" xlink:href="http://echo.mpiwg-berlin.mpg.de/zogilib?fn=/permanent/library/9EXVCG1R/figures/00027-01"/>
  </figure>
<p>
  <s xml:id="echoid-s706" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s707" xml:space="preserve">Pochiſſimo certo. </s>
  <s xml:id="echoid-s708" xml:space="preserve">Nulladimeno Signor Ofredi potria <lb/>eſſere, che in pratica s’eſperimentaſſe, che la natura non. <lb/></s>
  <s xml:id="echoid-s709" xml:space="preserve">ſprezzaſſe queſto poco peſo, e che Paria AC, in fatti graui-<lb/>taſſe, &amp; </s>
  <s xml:id="echoid-s710" xml:space="preserve">il modo è queſto. </s>
  <s xml:id="echoid-s711" xml:space="preserve">Si prenda la laminetta SI, di mate-<lb/>ria, la quale non ſi poſſa inzuppare, come ſarebbe argento, <lb/>oro, &amp;</s>
  <s xml:id="echoid-s712" xml:space="preserve">c. </s>
  <s xml:id="echoid-s713" xml:space="preserve">e ſia la maſſima, ſi che niente più groſſa, ſi profon-<lb/>daſſe, e ſi collochi nell’acqua. </s>
  <s xml:id="echoid-s714" xml:space="preserve">E manifeſto, che ſe l’aria <lb/>non aggiunge peſo, come dice il Galileo, anco quando s’al-<lb/>teraſſe, facendoſi più denſa, ò più rara, non per queſto la la-<lb/>minetta farebbe mutation alcuna quanto al diſcendere. </s>
  <s xml:id="echoid-s715" xml:space="preserve">Ma <lb/>ſe l’aria AC, in fatti grauita, ogni volta che con qualche ar-<lb/>tificio ſi farà più denſa, &amp; </s>
  <s xml:id="echoid-s716" xml:space="preserve">in conſeguenza più graue, la lami-<lb/>netta SI, ſubito diſcenderà; </s>
  <s xml:id="echoid-s717" xml:space="preserve">perche all’hora A S, ſarà più <lb/>graue in ſpecie di altretant’acqua. </s>
  <s xml:id="echoid-s718" xml:space="preserve">Ma che, che ſucceda di <lb/>queſta eſperienza, io giudico che aſsolutamente non ſolo <lb/>l’acqua, ma anco l’aria grauiti nella medema acqua. </s>
  <s xml:id="echoid-s719" xml:space="preserve">E tanto <lb/>tenirò fermamente, ſino che ſenti qualche ragione in con-<lb/>trario, che mi conuinca.</s>
  <s xml:id="echoid-s720" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s721" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s722" xml:space="preserve">V.</s>
  <s xml:id="echoid-s723" xml:space="preserve">S. </s>
  <s xml:id="echoid-s724" xml:space="preserve">aſpetti, che hora mi ſouienne d’vn’altro luogo del
<pb o="22" file="00028" n="28" rhead="_DIALOGO_"/>
Galileo in ſimil propoſito, nel quale anco aſſegna certa ra-<lb/>gione. </s>
  <s xml:id="echoid-s725" xml:space="preserve">Laſcino ch’io lo cerchi. </s>
  <s xml:id="echoid-s726" xml:space="preserve">Eccolo _à carte 34. </s>
  <s xml:id="echoid-s727" xml:space="preserve">de medemi_ <lb/>_gallegianti. </s>
  <s xml:id="echoid-s728" xml:space="preserve">Il dir poi, dice egli, che l’acqua poſſi accreſcer peſo alle_ <lb/>_coſe, ch’in eſſa sijno collocate è falſiſſimo, perche l’acqua nell’ acqua_ <lb/>_non bà grauità veruna, poiche ella non vidiſcende_. </s>
  <s xml:id="echoid-s729" xml:space="preserve">Ecco adunque <lb/>la cagione: </s>
  <s xml:id="echoid-s730" xml:space="preserve">non diſcende, adunque non ha grauità.</s>
  <s xml:id="echoid-s731" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s732" xml:space="preserve">_Conte_. </s>
  <s xml:id="echoid-s733" xml:space="preserve">Caro Sig. </s>
  <s xml:id="echoid-s734" xml:space="preserve">Ofredi mi facia vn fauore; </s>
  <s xml:id="echoid-s735" xml:space="preserve">s’al zi da queſta ſedia, <lb/>ſopra la quale ſiede, e vadi ponerſi a ſedere ſopra quel tauo-<lb/>lino, ſopra il quale vi ſono quelli tomi dell’ Atlante.</s>
  <s xml:id="echoid-s736" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s737" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s738" xml:space="preserve">Io non la ſeruirò già in queſto, perche io non la voglio <lb/>far ridere con la mia caduta, a riſchio anco di rompermi il <lb/>collo, ouero almeno di ſtroppiarmi.</s>
  <s xml:id="echoid-s739" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s740" xml:space="preserve">_Conte_. </s>
  <s xml:id="echoid-s741" xml:space="preserve">Non vi è pericolo. </s>
  <s xml:id="echoid-s742" xml:space="preserve">Di che teme?</s>
  <s xml:id="echoid-s743" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s744" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s745" xml:space="preserve">V. </s>
  <s xml:id="echoid-s746" xml:space="preserve">S. </s>
  <s xml:id="echoid-s747" xml:space="preserve">hà volontà di burlare. </s>
  <s xml:id="echoid-s748" xml:space="preserve">Mò non vede li piedi ſottili <lb/>del tauolino, li quali appena poſſono ſoſtenere il peſo delli <lb/>Libri, che vi ſono ſopra? </s>
  <s xml:id="echoid-s749" xml:space="preserve">Che ſarà quando v’aggiunga quel. <lb/></s>
  <s xml:id="echoid-s750" xml:space="preserve">Io del mio corpo, che non è così picciolo?</s>
  <s xml:id="echoid-s751" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s752" xml:space="preserve">_Conte_. </s>
  <s xml:id="echoid-s753" xml:space="preserve">Non temi di queſto, perche li Libri iui non peſano.</s>
  <s xml:id="echoid-s754" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s755" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s756" xml:space="preserve">Come non peſano? </s>
  <s xml:id="echoid-s757" xml:space="preserve">Sò che peſano beniſſimo.</s>
  <s xml:id="echoid-s758" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s759" xml:space="preserve">_Conte_. </s>
  <s xml:id="echoid-s760" xml:space="preserve">Non peſano certo, s’è vera la conſeguenza, non diſcen-<lb/>dono, adunque non peſano.</s>
  <s xml:id="echoid-s761" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s762" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s763" xml:space="preserve">Intendo. </s>
  <s xml:id="echoid-s764" xml:space="preserve">Vuol dir V. </s>
  <s xml:id="echoid-s765" xml:space="preserve">S. </s>
  <s xml:id="echoid-s766" xml:space="preserve">che ſi come peſano, ſe bene non <lb/>diſcendono impediti dal tauolino, così anco l’acqua, e l’aria <lb/>poſſono peſare, e in queſta, e in quella, ſe bene non diſcendo-<lb/>no, impedite dal momento di quella, che con la loro diſce-<lb/>ſa dourebbero cacciare dal proprio luogo. </s>
  <s xml:id="echoid-s767" xml:space="preserve">Ma laſciamo paſ-<lb/>ſare queſta conſeguenza, e vediamo quello che il Galileo <lb/>ſoggiunge in confermatione di ciò, _Anzi,_ dice egli. </s>
  <s xml:id="echoid-s768" xml:space="preserve">_ſe vorremo_ <lb/>_ben conſiderare quello, che facia qualunque immenſa mole d’acqua,_ <lb/>_che ſia ſoprapoſta ad vn corpo graue, che in quella ſia locato, troua-_ <lb/>_vemo per eſperienza, ch’ella per l’oppoſito, più to ſto gli diminuiſſe in_ <lb/>_gran parte il peſo, e che noi potremo ſoleuar tal pietra grauiſſima dal_ <lb/>_fondo dell’ aqua, che rimoſſa l’acqua non la potremo altrimente alza_. <lb/></s>
  <s xml:id="echoid-s769" xml:space="preserve">_re._ </s>
  <s xml:id="echoid-s770" xml:space="preserve">Queſte dottrine ſono veriſſime; </s>
  <s xml:id="echoid-s771" xml:space="preserve">onde biſogna dire, che <lb/>anco ſia vero, che l’acqua, e molto meno l’aria nell’acqua <lb/>non grauitino.</s>
  <s xml:id="echoid-s772" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s773" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s774" xml:space="preserve">Io non m’arrogo di decidere, e determinare ſopra la ve. <lb/></s>
  <s xml:id="echoid-s775" xml:space="preserve">rità, ò falſità di queſte dottrine: </s>
  <s xml:id="echoid-s776" xml:space="preserve">bene io direi così. </s>
  <s xml:id="echoid-s777" xml:space="preserve">Quando
<pb o="23" file="00029" n="29" rhead="_TRIMO_"/>
il ſolido è poſto ſolo nell’acqua, all’hora queſta non v’ag. <lb/></s>
  <s xml:id="echoid-s778" xml:space="preserve">giunge peſo. </s>
  <s xml:id="echoid-s779" xml:space="preserve">Ma quando ſi pone nell’acqua congionto con <lb/>dell’acqua, ò aria, di modo che quello, chè poſto nell’acqua <lb/>ſia vn compoſto della materia del ſolido, e ò acqua, ò aria, <lb/>all’hora queſte aggiũgono grauità;</s>
  <s xml:id="echoid-s780" xml:space="preserve">non già che quella mate-<lb/>ria del ſolido ſia fatta più graue di quello, che era prima; </s>
  <s xml:id="echoid-s781" xml:space="preserve">ma <lb/>perche l’aggregato, che ſi pone nell’acqua, contiene, e il pe-<lb/>ſo del ſolido, e quello dell’acqua, ò aria, che pure peſano.</s>
  <s xml:id="echoid-s782" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s783" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s784" xml:space="preserve">Io non capiſco molto chiaramente queſti ſuoi detti.</s>
  <s xml:id="echoid-s785" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s786" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s787" xml:space="preserve">Io mi dichiarerò con eſempi. </s>
  <s xml:id="echoid-s788" xml:space="preserve">Prendiamo vn pezzo di <lb/>oro, e faciamone vna sfera, ò altro corpo, che non habbia <lb/>cauità all’hora queſto ſolido ſe collocherà nell’acqua ſolo; <lb/></s>
  <s xml:id="echoid-s789" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s790" xml:space="preserve">in queſto modo ſe peſaſse in aria libre 100. </s>
  <s xml:id="echoid-s791" xml:space="preserve">e tant’acqua, <lb/>quanta è eſſo ne peſaſſe 5. </s>
  <s xml:id="echoid-s792" xml:space="preserve">ſe lo ripeſaſſimo nell’ acqua, tro-<lb/>uareſſimo il ſuo peſo di libre 95. </s>
  <s xml:id="echoid-s793" xml:space="preserve">Si riduca l’oro in vaſo, e riē-<lb/>pito d’ac qua ſi peſi in aria, peſarà certo più di libre 100. </s>
  <s xml:id="echoid-s794" xml:space="preserve">Peſi <lb/>libre 102. </s>
  <s xml:id="echoid-s795" xml:space="preserve">ſe riponghi nell’acqua; </s>
  <s xml:id="echoid-s796" xml:space="preserve">tanto, e tanto trouaremo <lb/>il ſuo peſo di libre 95. </s>
  <s xml:id="echoid-s797" xml:space="preserve">Ma la mole dell’acqua, che ſi parago-<lb/>na con l’aggregato in eſſa collocato, non è più tanta ſola-<lb/>mente, quant’era la materia del vaſo; </s>
  <s xml:id="echoid-s798" xml:space="preserve">ma tanta quant’è tut-<lb/>to l’aggregato, che ſi pone nell’acqua; </s>
  <s xml:id="echoid-s799" xml:space="preserve">e leua da tutto tanto <lb/>peſo, quant’è eſſa, cioè libre 7. </s>
  <s xml:id="echoid-s800" xml:space="preserve">Hora ſe l’acqua nell’acqua <lb/>non peſaſſe, come trouareſſimo il medemo peſo di libre 95? </s>
  <s xml:id="echoid-s801" xml:space="preserve"><lb/>Non trouareſſimo che 93. </s>
  <s xml:id="echoid-s802" xml:space="preserve">Ma paſſiamo più oltre. </s>
  <s xml:id="echoid-s803" xml:space="preserve">Il mede-<lb/>mo vaſo pieno d’aria ſi peſi in eisa, ſi trouara pur il ſuo peſo <lb/>eſser libre 100. </s>
  <s xml:id="echoid-s804" xml:space="preserve">Habbia il ſuo coperchio, che l’otturi eſqui-<lb/>ſitamente, e ſi collochi queſt’aggregato entro l’acqua: </s>
  <s xml:id="echoid-s805" xml:space="preserve">eſ-<lb/>ſendo queſti maggior in mole, che non è il ſolo oro, ſe pa-<lb/>ragonerà non più con acqua, che peſi libre 5. </s>
  <s xml:id="echoid-s806" xml:space="preserve">ſole, come <lb/>quando ſi collocaua il ſolo oro, ma con acqua che peſi li-<lb/>bre 7. </s>
  <s xml:id="echoid-s807" xml:space="preserve">per cagione che il vano del vaſo’ſi ſuppone capace di <lb/>doi Libre. </s>
  <s xml:id="echoid-s808" xml:space="preserve">Adunque il peſo del vaſo ſi trouarà eſser libre 93. </s>
  <s xml:id="echoid-s809" xml:space="preserve"><lb/>Ma quando ſi ſommergeua il vaſo pieno d’ acqua, queſto <lb/>peſaua ſolo libre 95. </s>
  <s xml:id="echoid-s810" xml:space="preserve">adunque queſte due libre ſono la diffe-<lb/>renza del peſo dell’acqua nell’acqua, ſopra il peſo dell’aria <lb/>nell’acqua.</s>
  <s xml:id="echoid-s811" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s812" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s813" xml:space="preserve">Ma 10 non sò capirla. </s>
  <s xml:id="echoid-s814" xml:space="preserve">Sò pure per eſperienza, e lo toc-<lb/>co con mano, che non poſſo alzar quella pietra, ma ſe ſarà
<pb o="24" file="00030" n="30" rhead="_DIALOGO_"/>
ſommerſa nell’acqua, l’alzarò con pochiſſima fatica. </s>
  <s xml:id="echoid-s815" xml:space="preserve">Anzi <lb/>V. </s>
  <s xml:id="echoid-s816" xml:space="preserve">S. </s>
  <s xml:id="echoid-s817" xml:space="preserve">dice, e confeſſa, che l’oro, che in aria peſaua libre 100. <lb/></s>
  <s xml:id="echoid-s818" xml:space="preserve">in acqua ne peſa ſolo 95. </s>
  <s xml:id="echoid-s819" xml:space="preserve">E la _propoſ. </s>
  <s xml:id="echoid-s820" xml:space="preserve">7._ </s>
  <s xml:id="echoid-s821" xml:space="preserve">citata d’ Archimedc <lb/>proua manifeſtamente, che le coſe più graui dell’ humido, <lb/>collocate in eſso, ſono più leggieri di quanto peſa vna mole <lb/>dell’humido eguale ad eſse. </s>
  <s xml:id="echoid-s822" xml:space="preserve">Adunque l’acqua leua il peſo <lb/>dalla coſa collocata in eſsa.</s>
  <s xml:id="echoid-s823" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s824" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s825" xml:space="preserve">Se bene ſono certe l’eſperienze da lei portate, nulladi-<lb/>meno è falſiſſimo, che l’acqua, ò l hu nido leui aſsoluta-<lb/>mente il peſo alla pietra, ò all’oro; </s>
  <s xml:id="echoid-s826" xml:space="preserve">ſi che in realtà, e for-<lb/>malmente peſi meno in eſso, che fuori d’eſso. </s>
  <s xml:id="echoid-s827" xml:space="preserve">In gratia Sig. <lb/></s>
  <s xml:id="echoid-s828" xml:space="preserve">Ofredi mi facia vn fauore; </s>
  <s xml:id="echoid-s829" xml:space="preserve">alzi quella pietra.</s>
  <s xml:id="echoid-s830" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s831" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s832" xml:space="preserve">Ecco che la ſeruo. </s>
  <s xml:id="echoid-s833" xml:space="preserve">Ma, oime, che gran fatica. </s>
  <s xml:id="echoid-s834" xml:space="preserve">lo la laſcio <lb/>andare. </s>
  <s xml:id="echoid-s835" xml:space="preserve">Che diauolo de caprici ven<unsure/>gono a V.</s>
  <s xml:id="echoid-s836" xml:space="preserve">S.</s>
  <s xml:id="echoid-s837" xml:space="preserve">? Ha forſe <lb/>piacere ch’io m’habbi a ſrenare?</s>
  <s xml:id="echoid-s838" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s839" xml:space="preserve">_Matem_ Aſpetti vn poco. </s>
  <s xml:id="echoid-s840" xml:space="preserve">Laſci che le ponghi le mani ſotto. </s>
  <s xml:id="echoid-s841" xml:space="preserve">Fà <lb/>più tanta fatica? </s>
  <s xml:id="echoid-s842" xml:space="preserve">Sente più tanto peſo?</s>
  <s xml:id="echoid-s843" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s844" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s845" xml:space="preserve">Oime. </s>
  <s xml:id="echoid-s846" xml:space="preserve">Reſpira mio core. </s>
  <s xml:id="echoid-s847" xml:space="preserve">Io hora facio aſſai minor <lb/>fatica.</s>
  <s xml:id="echoid-s848" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s849" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s850" xml:space="preserve">Adunque ha perſo la pietra la primiera grauità?</s>
  <s xml:id="echoid-s851" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s852" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s853" xml:space="preserve">Non Sig. </s>
  <s xml:id="echoid-s854" xml:space="preserve">Ha la grauità medema, ma la fatica dell’a lzarla <lb/>ſe la ſiamo par<unsure/>tita <gap/> V. </s>
  <s xml:id="echoid-s855" xml:space="preserve">S. </s>
  <s xml:id="echoid-s856" xml:space="preserve">e me. </s>
  <s xml:id="echoid-s857" xml:space="preserve">l<unsure/>o alzo di ſopra, e V. </s>
  <s xml:id="echoid-s858" xml:space="preserve">S. </s>
  <s xml:id="echoid-s859" xml:space="preserve">ſpin-<lb/>ge di ſotto.</s>
  <s xml:id="echoid-s860" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s861" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s862" xml:space="preserve">Bene bene Signor Ofredi. </s>
  <s xml:id="echoid-s863" xml:space="preserve">Coſi camina il negotio della <lb/>pietra nell’acqua Queſta iui ha la medema grauità, che ha <lb/>fuori; </s>
  <s xml:id="echoid-s864" xml:space="preserve">ma V.</s>
  <s xml:id="echoid-s865" xml:space="preserve">S non la ſente tutta, perche non è ſolo nell al-<lb/>zarla.</s>
  <s xml:id="echoid-s866" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s867" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s868" xml:space="preserve">E coſa è quello, che m’aiuta? </s>
  <s xml:id="echoid-s869" xml:space="preserve">E forſe qualche ſpirito <lb/>acqueo?</s>
  <s xml:id="echoid-s870" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s871" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s872" xml:space="preserve">E tant’acqua in mole, quant’è la pietra, la quale caccia-<lb/>ta da eſsa dal proprio luogo, fa forza per diſcender ad occu-<lb/>parlo con vn tal momento, il quale ſempre combatte con <lb/>il momento della pietra, ch’è magg@ore d’eſso, pareggian-<lb/>done tanta portione quant’è eſso. </s>
  <s xml:id="echoid-s873" xml:space="preserve">Onde V. </s>
  <s xml:id="echoid-s874" xml:space="preserve">S. </s>
  <s xml:id="echoid-s875" xml:space="preserve">nell’alzar la<unsure/> <lb/>pietra non ſente, ne deue ſuperare che l’ecceſso di queſto <lb/>ſopra quello, con qualche coſa altro.</s>
  <s xml:id="echoid-s876" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s877" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s878" xml:space="preserve">Q@@e<unsure/>ſta dottrina non mi diſpiace. </s>
  <s xml:id="echoid-s879" xml:space="preserve">E parmi che da eſsa ſi<unsure/> <lb/>poſſi@@ferire, che ſe altri voleſse alzar dall’ acqua vn corpo
<pb o="25" file="00031" n="31" rhead="_TRIMO._"/>
d’egual grauità in ſpecie con eſsa, queſtinon faceſse fatica <lb/>alcuna, mentre il momento dell’acqua pareggiando quello <lb/>del graue, non laſciaria à chi alzaſſe nell’acqua, occaſione <lb/>alcuna d’affaticare.</s>
  <s xml:id="echoid-s880" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s881" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s882" xml:space="preserve">V. </s>
  <s xml:id="echoid-s883" xml:space="preserve">S. </s>
  <s xml:id="echoid-s884" xml:space="preserve">inferiſce troppo. </s>
  <s xml:id="echoid-s885" xml:space="preserve">Altra forza vi vuole per tener <lb/>vn peſo, altra per alzarlo. </s>
  <s xml:id="echoid-s886" xml:space="preserve">Per tenerlo non vi vuole che tan-<lb/>ta forza, quanto è il peſo; </s>
  <s xml:id="echoid-s887" xml:space="preserve">mà per alzarlo, forza maggiore, <lb/>e tanto maggiore, quanto più velocemente ſi pretende al-<lb/>zarlo. </s>
  <s xml:id="echoid-s888" xml:space="preserve">Per queſto hò detto di ſopra, che V.</s>
  <s xml:id="echoid-s889" xml:space="preserve">S. </s>
  <s xml:id="echoid-s890" xml:space="preserve">nell’alzar la <lb/>pictra nell’acqua deue ſuperare l’ecceſſo del momento di <lb/>queſta, ſopra quello dell’acqua, e qualche coſa altro.</s>
  <s xml:id="echoid-s891" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s892" xml:space="preserve">Coſi adunque camina il negotio: </s>
  <s xml:id="echoid-s893" xml:space="preserve">nel tener la pietra ſommerſa <lb/>nell’acqua, non vi vuole che tanta forza, quanto è l’ecceſſo <lb/>del momento della pietra, ſopra il momento dell’acqua. <lb/></s>
  <s xml:id="echoid-s894" xml:space="preserve">Nell’alzarla, più forza ſecondo l’incremento della velocità. </s>
  <s xml:id="echoid-s895" xml:space="preserve"><lb/>Nel tener coſa egualmente in ſpecie graue con l’acqua. </s>
  <s xml:id="echoid-s896" xml:space="preserve"><lb/>niuna forza. </s>
  <s xml:id="echoid-s897" xml:space="preserve">Nell’alzarla, pure qualche forza, ſecondo la <lb/>velocità.</s>
  <s xml:id="echoid-s898" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s899" xml:space="preserve">Enoti V.</s>
  <s xml:id="echoid-s900" xml:space="preserve">S. </s>
  <s xml:id="echoid-s901" xml:space="preserve">che ciò è tanto vero, che anco poſta nell’acqua per <lb/>forza coſa, che naturalmente galleggi, la quale anco natu-<lb/>ralmente ſarà ſpinta insù dal momento dell’acqua, chi vor-<lb/>rà eſtrarla con maggior velocità di quella, conla quale è <lb/>ſpinta in sù dal momento dell’acqua, dourà pure adoprar <lb/>forza proportionata alla velocità. </s>
  <s xml:id="echoid-s902" xml:space="preserve">E ritornando al noſtro <lb/>punto principale, diciamo pure, che la pietra nell’acqua nõ <lb/>perde punto la ſua grauità; </s>
  <s xml:id="echoid-s903" xml:space="preserve">benche nell’eſtrarla da eſſa altri <lb/>non la ſente tutta, come ſe l’alzaſſe fuori d’eſſa; </s>
  <s xml:id="echoid-s904" xml:space="preserve">perche il mo <lb/>mento del mezzo eguale alla coſa immerſa, combatte con <lb/>quello di queſta, ò pareggiandolo, ò ſuperandolo ſecondo <lb/>ilſuo ecceſso, ò almeno leuando da eſſo quant’è il ſuo. </s>
  <s xml:id="echoid-s905" xml:space="preserve">Coſi <lb/>nè l’acqua nell’acqua, nè l’aria nell’aria, ò nell’acqua, perde <lb/>la ſua grauità.</s>
  <s xml:id="echoid-s906" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s907" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s908" xml:space="preserve">M’arricordo ch’intorno à queſta materia fù detto qual-<lb/>che coſa nelle _Quarte conſiderationi_, riſpondendo a certe in-<lb/>ſtanze del dottiſſimo Signor Zerilli.</s>
  <s xml:id="echoid-s909" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s910" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s911" xml:space="preserve">V.</s>
  <s xml:id="echoid-s912" xml:space="preserve">S. </s>
  <s xml:id="echoid-s913" xml:space="preserve">ha buona memoria: </s>
  <s xml:id="echoid-s914" xml:space="preserve">è veriſſimo. </s>
  <s xml:id="echoid-s915" xml:space="preserve">In gratia Signor <lb/>Conte ritroui il _noſtro Dialogo ſeſto_ verſo il fine.</s>
  <s xml:id="echoid-s916" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s917" xml:space="preserve">_Conte_. </s>
  <s xml:id="echoid-s918" xml:space="preserve">Ecco, che _à carte_ 40. </s>
  <s xml:id="echoid-s919" xml:space="preserve">ſi recitano le parole del Signor Ze-
<pb o="26" file="00032" n="32" rhead="_DIALOGO_"/>
rilli, che dicono. </s>
  <s xml:id="echoid-s920" xml:space="preserve">_Se io porrò vna palla di legno à galleggiare nell_. <lb/></s>
  <s xml:id="echoid-s921" xml:space="preserve">_acqua certo è, che eſſa quiui per eſſer equilibrata non hauerà alcuna_ <lb/>_grauità_. </s>
  <s xml:id="echoid-s922" xml:space="preserve">Coſi _à carte_ 41. </s>
  <s xml:id="echoid-s923" xml:space="preserve">ſi recitano altre ſue parole, eſono. </s>
  <s xml:id="echoid-s924" xml:space="preserve"><lb/>_Due peſi equilibrati in vna bilancia, e nei termini opposti d’vna_ <lb/>_ruota diſteſa orizontalmente, e conuertibile intorno al ſuo centro_ <lb/>_non ſolamente ſono priui di grauità, &amp;</s>
  <s xml:id="echoid-s925" xml:space="preserve">c_.</s>
  <s xml:id="echoid-s926" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s927" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s928" xml:space="preserve">Riſpondeſſimo anco eſſer falſiſſimo che li due peſi equili-<lb/>brati nella bilancia ſiano priui di grauità, hauendo ambidue <lb/>li loro momenti, con li quali operano, ma per eſſer queſti <lb/>eguali, non vi eſſere cagione dimoto; </s>
  <s xml:id="echoid-s929" xml:space="preserve">che per altro chi al-<lb/>zaſſe la bilancia, ſentiria beniſſimo il loro peſo. </s>
  <s xml:id="echoid-s930" xml:space="preserve">Così il cor-<lb/>po galleggiante non eſſer priuo di peſo, benche priuo di mo-<lb/>to: </s>
  <s xml:id="echoid-s931" xml:space="preserve">onde, chi peſaſſe vn vaſo d’acqua di peſo di libre 10. </s>
  <s xml:id="echoid-s932" xml:space="preserve">e vi <lb/>poneſſe vn galleggiante, che fuori d’eſsa peſaſſe vna libra, e <lb/>peſaſſe tutt’aſſieme, ritrouarebbe vn peſo di libre 11. </s>
  <s xml:id="echoid-s933" xml:space="preserve">Non <lb/>perdono adunque li corpi poſti nell’acqua, ò ſopra l’acqua <lb/>la loro grauità aſſolutamente, mà ſolo quanto al diſcendere <lb/>attualmente. </s>
  <s xml:id="echoid-s934" xml:space="preserve">Così l’acqua, el’aria nelli ſuoi ſimili non per-<lb/>dono la ſua grauità formalmente.</s>
  <s xml:id="echoid-s935" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s936" xml:space="preserve">Caro Sig. </s>
  <s xml:id="echoid-s937" xml:space="preserve">Ofredi mi facia vna gratia: </s>
  <s xml:id="echoid-s938" xml:space="preserve">ſpinga con vna mano in <lb/>giù queſta lance di quella bilancia, ch’io ſpingerò giù l’al-<lb/>tra.</s>
  <s xml:id="echoid-s939" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s940" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s941" xml:space="preserve">Io ſpingo.</s>
  <s xml:id="echoid-s942" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s943" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s944" xml:space="preserve">Pur io ſpingo. </s>
  <s xml:id="echoid-s945" xml:space="preserve">Mà perche ſtà in equilibrio?</s>
  <s xml:id="echoid-s946" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s947" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s948" xml:space="preserve">Biſogna dire che noi ſpingiamo egualmente.</s>
  <s xml:id="echoid-s949" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s950" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s951" xml:space="preserve">Tanto fanno li graui. </s>
  <s xml:id="echoid-s952" xml:space="preserve">Grauitano egualmente, perciò <lb/>non ne ſegue moto. </s>
  <s xml:id="echoid-s953" xml:space="preserve">Ma V.</s>
  <s xml:id="echoid-s954" xml:space="preserve">S. </s>
  <s xml:id="echoid-s955" xml:space="preserve">ſpinga, ma non tanto quanto <lb/>prima. </s>
  <s xml:id="echoid-s956" xml:space="preserve">Vede V.</s>
  <s xml:id="echoid-s957" xml:space="preserve">S. </s>
  <s xml:id="echoid-s958" xml:space="preserve">come la bilancia diſcende dalla mia parte? <lb/></s>
  <s xml:id="echoid-s959" xml:space="preserve">Non già perche lei non ſpinga, ma perche ſpingendo io più <lb/>di lei, ſecondo l’ecceſſo del mio ſpingere ſopra il ſuo, facio <lb/>ſcender la mia lance, alla qual diſceſa, biſogna che di neceſ-<lb/>ſità ne ſegua l’aſceſa della ſua.</s>
  <s xml:id="echoid-s960" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s961" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s962" xml:space="preserve">In tutto queſto diſcorſo hò oſseruato V.</s>
  <s xml:id="echoid-s963" xml:space="preserve">S. </s>
  <s xml:id="echoid-s964" xml:space="preserve">che ſempre <lb/>nell’eſplicare il moto all’insù delle coſe più leggieri, l’hà di-<lb/>chiarato, quaſi che queſte ſijno ſpinte in sù dalla ſceſa delle <lb/>più graui; </s>
  <s xml:id="echoid-s965" xml:space="preserve">ſiche al vedere V.</s>
  <s xml:id="echoid-s966" xml:space="preserve">S. </s>
  <s xml:id="echoid-s967" xml:space="preserve">camina con l’opinione di Pla-<lb/>tone, e di quelli antichi. </s>
  <s xml:id="echoid-s968" xml:space="preserve">Ma queſta non è coſa tanto deciſa, <lb/>che lei l’habbi da prendere come coſa certa.</s>
  <s xml:id="echoid-s969" xml:space="preserve"/>
</p>
<pb o="27" file="00033" n="33" rhead="_TRIMO_."/>
<p>
  <s xml:id="echoid-s970" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s971" xml:space="preserve">Queſta pulſione è ſtata confermata, e con ragioni, e con <lb/>eſperienze tanto manifeſte da tanti grand’huomini, ch’io di <lb/>eſſa nieute dubito. </s>
  <s xml:id="echoid-s972" xml:space="preserve">Ne io per hora mi voglio affaticare a con-<lb/>fermarla. </s>
  <s xml:id="echoid-s973" xml:space="preserve">Ma l’esẽpio ſopra poſto della bilancia mi pare, che <lb/>molto manifeſtamente dichi<unsure/>ari, e dia a vedere come ſegui-<lb/>no queſti moti. </s>
  <s xml:id="echoid-s974" xml:space="preserve">G@à V.</s>
  <s xml:id="echoid-s975" xml:space="preserve">S. </s>
  <s xml:id="echoid-s976" xml:space="preserve">ſpingeua, ma per che io ſpingeuo <lb/>più di lei, dineceſſità facendo inclinar la mia lance, biſo-<lb/>gnaua che la ſua ſaliſse. </s>
  <s xml:id="echoid-s977" xml:space="preserve">Tanto fanno le coſe graui; </s>
  <s xml:id="echoid-s978" xml:space="preserve">poiche <lb/>eſsendo queſte collocate ò in libra artificiale, ò in libra na-<lb/>turale, alla diſceſa della più graue, è neceſsario che il meno <lb/>graue aſcenda, ſpinto in sù dal più graue. </s>
  <s xml:id="echoid-s979" xml:space="preserve">In ſomma ſe ſi da-<lb/>no coſe poſitiuamente leggieri, che queſte aſcendino per la <lb/>leggierezza, non ſi potrebbe certo negare; </s>
  <s xml:id="echoid-s980" xml:space="preserve">ma che coſe po-<lb/>ſitiuamente graui aſcendino da ſe, per il deſiderio, che hab-<lb/>bino di ſtare ſopra le più graui, non sò capirla;</s>
  <s xml:id="echoid-s981" xml:space="preserve">mentre elsen-<lb/>do vero, chele più grauia ppetiſcono di ſtar ſotto le meno <lb/>graui parmi che queſto baſti per far ſalire le meno graui. </s>
  <s xml:id="echoid-s982" xml:space="preserve">Al-<lb/>trimenti non sò come ſi verificaſse l’aſſioma, _Fruſtra fit per_ <lb/>_plura, quod poteſt fieri per pauciora_. </s>
  <s xml:id="echoid-s983" xml:space="preserve">Il dir anco che la medema <lb/>coſa habbia due facolta poſitiue, vna d’aſcendere ſopra le <lb/>più graui, l’altra di diſcendere ſotto le meno graui, parmi <lb/>pur contrariiſſimo alla buona Filoſofia. </s>
  <s xml:id="echoid-s984" xml:space="preserve">E pur biſognareb-<lb/>be confeſsarlo, mentre vediamo, che l’oglio comune, per eſẽ, <lb/>pio, ſaliſce ſopra l’acqua naturale, e diſcende ſotto il ſpirto <lb/>di vino.</s>
  <s xml:id="echoid-s985" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s986" xml:space="preserve">_Conte_. </s>
  <s xml:id="echoid-s987" xml:space="preserve">Se V.</s>
  <s xml:id="echoid-s988" xml:space="preserve">S. </s>
  <s xml:id="echoid-s989" xml:space="preserve">non vuole addurre alcuna dell’eſperienze, che <lb/>prouano la pulſione, ò eſtruſione, io in gratia del Sig. </s>
  <s xml:id="echoid-s990" xml:space="preserve">Ofre-<lb/>di non voglio mancare d’addurne vn paro, che riaſciranno <lb/>forſi nuoue, e a lei, &amp; </s>
  <s xml:id="echoid-s991" xml:space="preserve">al Signor Ofredi, eſsendo ſolo ſtate <lb/>prodotte dal Giornaliere di Venetia, eſono del noſtro Sig-<lb/>Rinaldini.</s>
  <s xml:id="echoid-s992" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s993" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s994" xml:space="preserve">Mò che forſe anco a Venetia hanno principiato a ſcriue-<lb/>re li auiſi Litterarij, all’v ſanza di Francia, Inghilterra, Ro-<lb/>ma, &amp; </s>
  <s xml:id="echoid-s995" xml:space="preserve">altri luoghi?</s>
  <s xml:id="echoid-s996" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s997" xml:space="preserve">_Conte_. </s>
  <s xml:id="echoid-s998" xml:space="preserve">Certo. </s>
  <s xml:id="echoid-s999" xml:space="preserve">Hoia la prima eſperienza in ſimil ſoggetto è re-<lb/>giſtrata ſotto li 15. </s>
  <s xml:id="echoid-s1000" xml:space="preserve">Marzo 1671 Così Preſe il Sig. </s>
  <s xml:id="echoid-s1001" xml:space="preserve">Rinaldi-<lb/>ni vn cannello chiuſo da vna parte, &amp; </s>
  <s xml:id="echoid-s1002" xml:space="preserve">aperto dall’altra, lun-<lb/>go 4. </s>
  <s xml:id="echoid-s1003" xml:space="preserve">braccia, e lo riempì di ſpirto divino, ponendoli anco
<pb o="28" file="00034" n="34" rhead="_DIALOGO_"/>
vna balina, che galleggiaua e ſerò la parte aperta con veſica <lb/>d’animale beniſſimo ligata e volrato il cannello, numerò <lb/>con il pendolo il tempo, che conſumò la balla a ſalire, che <lb/>furno zoo. </s>
  <s xml:id="echoid-s1004" xml:space="preserve">vibrationi. </s>
  <s xml:id="echoid-s1005" xml:space="preserve">Poi riempì il cannello d’acqua comu-<lb/>ne e fatto il medemo come ſopra, numerò pure le vibratio-<lb/>ni ſpeſe a ſalice, che furono ſolo 100</s>
</p>
<p>
  <s xml:id="echoid-s1006" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s1007" xml:space="preserve">Belliſſima eſperienza, che moſtra l’eſtruſione, mentre <lb/>la balla dal maggior momento dell’acqua comune è ſpinta <lb/>in sù più velocemente il doppio, che dal minor momento <lb/>del ſpirto di vino; </s>
  <s xml:id="echoid-s1008" xml:space="preserve">douendo riuſcir l’oppoſto quando ſaliſce <lb/>per leggierezza poſitiua, che più facilmente la condurebbe <lb/>per il mezzo più tenue, che per il più craſſo.</s>
  <s xml:id="echoid-s1009" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1010" xml:space="preserve">Eperò ben vero che chitentara queſta eſperienza, enon ado-<lb/>perarà le medeme coſe à puntino adoperare dal Signor Ri-<lb/>naldini, ritrouarà varietà proueniente da vno, ò più capi. <lb/></s>
  <s xml:id="echoid-s1011" xml:space="preserve">Perche li pendoli variano le vibrationi conforme variano la <lb/>lunghezza. </s>
  <s xml:id="echoid-s1012" xml:space="preserve">Non tutte l’acque comuni, ne tutti li ſpirti <lb/>di vino hanno la medema grauità. </s>
  <s xml:id="echoid-s1013" xml:space="preserve">Ne ogni galleggiante ha <lb/>con eſſe acque la medema proportione. </s>
  <s xml:id="echoid-s1014" xml:space="preserve">Sempre però s’eſ-<lb/>perimentarà che il galleggiante ſa hià in minor rempo per <lb/>l’acqua comune, che per il ſpirito di vino. </s>
  <s xml:id="echoid-s1015" xml:space="preserve">Ma veniamo all’-<lb/>altra eſperienza.</s>
  <s xml:id="echoid-s1016" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1017" xml:space="preserve">_Conte_. </s>
  <s xml:id="echoid-s1018" xml:space="preserve">Queſta è regiſtrata ſotto il primo Maggio paſſato. </s>
  <s xml:id="echoid-s1019" xml:space="preserve">Preſe <lb/>il vaſo divetro A D, con il collo lungo ſufficiente à procu-<lb/>rar il vuoto mediante l’argento viuo; </s>
  <s xml:id="echoid-s1020" xml:space="preserve">la bocca D, era chiu-<lb/>ſa con veſica ligata come ſopra, e l’im merſe nel vaſo EF, <lb/>pieno d’argento viuo; </s>
  <s xml:id="echoid-s1021" xml:space="preserve">poi per l’orificio A, calo nel vaſo vn <lb/>pezzetto di eſca ligata con vn filo di bombace intinto nel <lb/>ſolfo, ligato il tutto con vn fil di ferro, di modo che toccaſ-<lb/>ſe il vaſo in O, come nella figura; </s>
  <s xml:id="echoid-s1022" xml:space="preserve">poi riempì tutro AD d’-<lb/>argento viuo, e con veſica di porco, e ligatura otturò ſtret-<lb/>tamente l’orificio A; </s>
  <s xml:id="echoid-s1023" xml:space="preserve">poi forò la veſica D, ſtante nell’ar-<lb/>gento viuo, di modo che calò l’argento viuo ſino alla con-<lb/>ſneta altezza CI. </s>
  <s xml:id="echoid-s1024" xml:space="preserve">Fatto queſto fece prendere la lucerna da <lb/>lauorare i vetri, e con il ſofietto fece ſofiare di modo che <lb/>la fiamma colpiſce nell’O, cioè eſca, e ſolforini. </s>
  <s xml:id="echoid-s1025" xml:space="preserve">Vide che <lb/>il fumo dell’eſca deſcendeua, e non aſcendeua, e li ſolforini <lb/>ſi conſumauano ſenza leuar ſiãma. </s>
  <s xml:id="echoid-s1026" xml:space="preserve">Aperto ſucceſſiuamente
<pb o="29" file="00035" n="35" rhead="_TRIMO_"/>
<anchor type="figure" xlink:label="fig-00035-01a" xlink:href="fig-00035-01"/>
Porificio A, e vide il fumo, e fiamma ſolleuarſi, &amp; </s>
  <s xml:id="echoid-s1027" xml:space="preserve">aſcende-<lb/>re, certo non per altro, che per la eſpulſione, che fece l’aria <lb/>entrata.</s>
  <s xml:id="echoid-s1028" xml:space="preserve"/>
</p>
<div xml:id="echoid-div6" type="float" level="2" n="1">
  <figure xlink:label="fig-00035-01" xlink:href="fig-00035-01a">
    <image file="00035-01" xlink:href="http://echo.mpiwg-berlin.mpg.de/zogilib?fn=/permanent/library/9EXVCG1R/figures/00035-01"/>
  </figure>
</div>
<p>
  <s xml:id="echoid-s1029" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s1030" xml:space="preserve">Belliſsime eſperienze, nulladimeno io circa queſta eſtru-<lb/>ſione hò vna gran difficoltà, la quale mi par inſolubile, ſe <lb/>vogliamo guardar all’effetto, che ne ſegue; </s>
  <s xml:id="echoid-s1031" xml:space="preserve">e la difficoltà la <lb/>cagiona _la prop. </s>
  <s xml:id="echoid-s1032" xml:space="preserve">6 d’ Archimede de Inſid. </s>
  <s xml:id="echoid-s1033" xml:space="preserve">Hum_ che dice così. </s>
  <s xml:id="echoid-s1034" xml:space="preserve">_Soli_-<lb/>_da leuiora bumido vi preſſa in humidum ſurſum feruntur tanta vi,_ <lb/>_quanta humidum habens molem æqualem cum magnitudine eſt gra-_ <lb/>_n<unsure/>ius ipſa_. </s>
  <s xml:id="echoid-s1035" xml:space="preserve">Adunque vn legno più leggiero dell’acqua poſto in <lb/>cſſa, ſalirà con tanto empito, quant’è l’ecceſſo della grauità <lb/>d’vna mole d’acqua eguale allegno, ſopra la grauità del me-
<pb o="30" file="00036" n="36" rhead="_DIALOGO_"/>
demo legno. </s>
  <s xml:id="echoid-s1036" xml:space="preserve">Quando queſto legno foſse ſpinto in sù da que-<lb/>ſt’ecceſſo, ne ſeguirebbe, che ò più fondo ò meno che foſse <lb/>ſpinto queſto legno, ſempre dourebbe aſcender con la me. <lb/></s>
  <s xml:id="echoid-s1037" xml:space="preserve">dema velocità; </s>
  <s xml:id="echoid-s1038" xml:space="preserve">perche eſsendo ſempre il medemo ecceſso in <lb/>tutti li luoghi, non può che operar nel medemo modo, _iux-_ <lb/>_ta illud, Idem manens idem ſemper facit idem._ </s>
  <s xml:id="echoid-s1039" xml:space="preserve">E pure non è così, <lb/>perche il legno ſpinto poco ſott’acqua, aſcende con viia tal <lb/>velocità: </s>
  <s xml:id="echoid-s1040" xml:space="preserve">più, con maggiore. </s>
  <s xml:id="echoid-s1041" xml:space="preserve">La qual tanto più creſce quan-<lb/>to più ſi profonda. </s>
  <s xml:id="echoid-s1042" xml:space="preserve">Il che manifeſta li sbalzi diuerſi, che fà in <lb/>maggior, o minor quantita fuori della medema acqua arri-<lb/>uato alla ſua eſtremità. </s>
  <s xml:id="echoid-s1043" xml:space="preserve">Biſogna adunque dire, che ſia por-<lb/>tato in sù da vna ſua leggierezza, la quale facia nel ſalire co-<lb/>mela grauità nel diſcendere, cioè cheil ſuo moto ſia aſcen-<lb/>dendo più veloce in fine, che in principio; </s>
  <s xml:id="echoid-s1044" xml:space="preserve">e tanto più velo-<lb/>ce, quanto più la via per la quale aſcende è lunga.</s>
  <s xml:id="echoid-s1045" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1046" xml:space="preserve">_Matem_ E queſta Sig. </s>
  <s xml:id="echoid-s1047" xml:space="preserve">Ofredi vi pare difficoltà tanto inſolubile? <lb/></s>
  <s xml:id="echoid-s1048" xml:space="preserve">Io credo che ſi poſſi ſodisfar ad eſſa molto facilmcnte. </s>
  <s xml:id="echoid-s1049" xml:space="preserve">E pri-<lb/>mieramente io credo, che quell’a ſſioma da V S. </s>
  <s xml:id="echoid-s1050" xml:space="preserve">recitato, <lb/>che _idem &amp;</s>
  <s xml:id="echoid-s1051" xml:space="preserve">c._ </s>
  <s xml:id="echoid-s1052" xml:space="preserve">posſi riceuer molte modificationi. </s>
  <s xml:id="echoid-s1053" xml:space="preserve">Ma al noſtro <lb/>propoſito, vorrei, che V. </s>
  <s xml:id="echoid-s1054" xml:space="preserve">S. </s>
  <s xml:id="echoid-s1055" xml:space="preserve">midiceſſe. </s>
  <s xml:id="echoid-s1056" xml:space="preserve">Hà mai oſſeruato <lb/>quando alcuno ſona vna campana, ò pure quando li fanciul-<lb/>li ſi biſcolano?</s>
  <s xml:id="echoid-s1057" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1058" xml:space="preserve">_Ofred._ </s>
  <s xml:id="echoid-s1059" xml:space="preserve">L’hò oſseruato certo.</s>
  <s xml:id="echoid-s1060" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1061" xml:space="preserve">_Matem_ Mi dica in gratia, come fà?</s>
  <s xml:id="echoid-s1062" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1063" xml:space="preserve">_Ofred_ Che ſiamo diuentati fanciulli di badar à queſte bagat-<lb/>telle?</s>
  <s xml:id="echoid-s1064" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1065" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s1066" xml:space="preserve">Nò, nò, mi dica pure, perche da queſte bagattelle caua-<lb/>remo dottrine forſe molto ſerie.</s>
  <s xml:id="echoid-s1067" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1068" xml:space="preserve">_Ofred._ </s>
  <s xml:id="echoid-s1069" xml:space="preserve">Già che vuol che dichi, dirò del biſcolare, eſſendo il me-<lb/>democon il ſonare la cãpana. </s>
  <s xml:id="echoid-s1070" xml:space="preserve">Vn fanciullo da vna ſpinta all’ <lb/>altro, che ſta ſedendo ſopra la corda pendente, e lo muoue. <lb/></s>
  <s xml:id="echoid-s1071" xml:space="preserve">Poi replica la ſeconda ſpinta, e poi la terza, e coſi ſucceſſiua-<lb/>mente; </s>
  <s xml:id="echoid-s1072" xml:space="preserve">e quello, che ſtà ſedendo cõcepiſce ſempre maggior <lb/>velocità, sìche poi con ogni picciol ſpinta ſegue a muouerſi <lb/>aſſai velocemente. </s>
  <s xml:id="echoid-s1073" xml:space="preserve">Anzi che ben ſpeſſo ne meno ſpingendo, <lb/>il biſcolato ſaliſce molto alto.</s>
  <s xml:id="echoid-s1074" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1075" xml:space="preserve">_Matem_ Mà ſe quello, che ſpinge, ſpingeſse ſempre egualmente, <lb/>coſa ne ſeguirebbe?</s>
  <s xml:id="echoid-s1076" xml:space="preserve"/>
</p>
<pb o="31" file="00037" n="37" rhead="PRIMO"/>
<p>
  <s xml:id="echoid-s1077" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s1078" xml:space="preserve">Corpo di me, andarebbe troppo alto, con pericolo di <lb/>romperfi il collo.</s>
  <s xml:id="echoid-s1079" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1080" xml:space="preserve">_Matem._ </s>
  <s xml:id="echoid-s1081" xml:space="preserve">Ma perche? </s>
  <s xml:id="echoid-s1082" xml:space="preserve">Non ſarebbero ſempre ſpinte eguali? </s>
  <s xml:id="echoid-s1083" xml:space="preserve">Adũ-<lb/>que douerebbero ſempre cagionar il medemo moto.</s>
  <s xml:id="echoid-s1084" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1085" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s1086" xml:space="preserve">Certo che lo cagionano, ma il mobile non è ſempre il <lb/>medemo: </s>
  <s xml:id="echoid-s1087" xml:space="preserve">perche la prima ſpinta lo ritroua in quiete; </s>
  <s xml:id="echoid-s1088" xml:space="preserve">la ſe-<lb/>conda lo ritroua già in moto; </s>
  <s xml:id="echoid-s1089" xml:space="preserve">la terza più; </s>
  <s xml:id="echoid-s1090" xml:space="preserve">e la quarta ſem-<lb/>pre più.</s>
  <s xml:id="echoid-s1091" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1092" xml:space="preserve">_Matem._ </s>
  <s xml:id="echoid-s1093" xml:space="preserve">Tanto che Signor Ofredi altro è muouere con vna tal <lb/>forza vn mobile, che ſia in quiete, altro che già ſia in moto. <lb/></s>
  <s xml:id="echoid-s1094" xml:space="preserve">E quando queſto ſia in moto, la medema forza velocitarà <lb/>più il ſuo moto, che quando l'habb ia da rimuouer dalla. </s>
  <s xml:id="echoid-s1095" xml:space="preserve"><lb/>quiete. </s>
  <s xml:id="echoid-s1096" xml:space="preserve">E quanto più lo ritrouarà muouerſi velocemente, <lb/>tanto accreſcerà maggior velocità. </s>
  <s xml:id="echoid-s1097" xml:space="preserve">Mò s'immagini che tan-<lb/>to operi l'acqua nel cacciar sù il galleggiante in eſſa immer-<lb/>ſo per forza.</s>
  <s xml:id="echoid-s1098" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1099" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s1100" xml:space="preserve">Non sò ancora vederne il modo.</s>
  <s xml:id="echoid-s1101" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1102" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s1103" xml:space="preserve">LMPO, ſia il galeggiante cacciato a forza nell'acqua, <lb/>al quale ſia eguale l'acqua FGML. </s>
  <s xml:id="echoid-s1104" xml:space="preserve">Queſta ritrouandolo iui <lb/>ſenza moto, appetendo la diſceſa a riempir il luogo occupa-<lb/>to da eſſo, principia ſpingerlo in sù con l'ecceſso del ſuo <lb/>momento ſopra quello del galleggiante, il quale pure con <lb/>l'inſita grauità appetiſce l'accoſtamento al centro? </s>
  <s xml:id="echoid-s1105" xml:space="preserve">e ſà for-<lb/>za co'l ſuo momento per non eſſer cacciato, ma biſogna, <lb/>che ceda al maggiore. </s>
  <s xml:id="echoid-s1106" xml:space="preserve">Salendo queſti, ò per meglio dire, eſ-<lb/>ſendo ſpinto in sù, incontra pure in altra acqua, che fà for-<lb/>za per diſcendere; </s>
  <s xml:id="echoid-s1107" xml:space="preserve">come per eſempio ſpinto in H L O N, ri-<lb/>troua l'acqua EFLH, eguale alla prima, e che lo ſpinge con <lb/>momento eguale al primiero; </s>
  <s xml:id="echoid-s1108" xml:space="preserve">ma con queſta differenza, <lb/>che il primo momento lo trouò in quiete, e queſto in mo-<lb/>to, e così introduce maggior velocità. </s>
  <s xml:id="echoid-s1109" xml:space="preserve">E così quanto più <lb/>è ſpinto in sù, ſempre troua eguali momenti d' acque a eſso <lb/>eguali, che lo ſpingono con li loro ecceſſi in sù, ma ſempre <lb/>con maggior velocità, perche anco lo ritrouano in moto <lb/>già con maggior velocità. </s>
  <s xml:id="echoid-s1110" xml:space="preserve">Si che adunque eſſendo per eſ-<lb/>ſempio tutto l'AGMB, che lo ſpinge in sù ſucceſſiuamente, <lb/>e ſempre lo ritroua in moto più veloce, quanto più s'accoſta <lb/>alla ſuperſicie ABD; </s>
  <s xml:id="echoid-s1111" xml:space="preserve">chi non vede, che quanto maggiore
<pb o="32" file="00038" n="38" rhead="_DIALOGO_"/>
<anchor type="figure" xlink:label="fig-00038-01a" xlink:href="fig-00038-01"/>
farà la profondità BM, tãto più nel fine ſarà il moto veloce? <lb/></s>
  <s xml:id="echoid-s1112" xml:space="preserve">E coſi ſi faranno quelli sbalzi maggiori, e maggiori. </s>
  <s xml:id="echoid-s1113" xml:space="preserve">Tutto <lb/>queſto diſcorſo però ſtà fondato ſu’l ſuppoſto chetutta l’ac-<lb/>qua ſia della medema grauità.</s>
  <s xml:id="echoid-s1114" xml:space="preserve"/>
</p>
<div xml:id="echoid-div7" type="float" level="2" n="2">
  <figure xlink:label="fig-00038-01" xlink:href="fig-00038-01a">
    <image file="00038-01" xlink:href="http://echo.mpiwg-berlin.mpg.de/zogilib?fn=/permanent/library/9EXVCG1R/figures/00038-01"/>
  </figure>
</div>
<p>
  <s xml:id="echoid-s1115" xml:space="preserve">_Ofred._ </s>
  <s xml:id="echoid-s1116" xml:space="preserve">Se bene mi pare che V.</s>
  <s xml:id="echoid-s1117" xml:space="preserve">S. </s>
  <s xml:id="echoid-s1118" xml:space="preserve">poteua portar eſempij più pro-<lb/>prij, come di chi tira, e ſpinge la barca nell’acqua, ò ſimili; <lb/></s>
  <s xml:id="echoid-s1119" xml:space="preserve">nulladimeno queſta ragione non mi diſpiace, e la pulſione <lb/>m’è entrata vn poco più in gratia di quello che era. </s>
  <s xml:id="echoid-s1120" xml:space="preserve">Come <lb/>parimente io reſto ſempre più capace, che le coſe graui ſem-<lb/>pre in tutti li luoghi, e mezzi eſercitino la loro grauità for-<lb/>malmente, ſe bene poi impedite, non diſcendono.</s>
  <s xml:id="echoid-s1121" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1122" xml:space="preserve">_Conte._ </s>
  <s xml:id="echoid-s1123" xml:space="preserve">Ma io direicosì. </s>
  <s xml:id="echoid-s1124" xml:space="preserve">Se l’acqua nell’acqua non grauita, ſi che <lb/>vna portione d’eſsa poſta in mezzo all’altra nõ peſi, ò graui-<lb/>ti, il medemo ſi potrà dire dell’altre portioni. </s>
  <s xml:id="echoid-s1125" xml:space="preserve">Adunque cõ-<lb/>ſtando tutta l’acqua di queſte portioni, e niuna d’eſse graui-<lb/>tando, ne anco tutta l’acqua v.</s>
  <s xml:id="echoid-s1126" xml:space="preserve">g. </s>
  <s xml:id="echoid-s1127" xml:space="preserve">del canale, grauitarà ſopra <lb/>il fondo. </s>
  <s xml:id="echoid-s1128" xml:space="preserve">Hora crede Sig. </s>
  <s xml:id="echoid-s1129" xml:space="preserve">Ofredi che queſto ſia vero? </s>
  <s xml:id="echoid-s1130" xml:space="preserve">Io non <lb/>I’hò per così ſemplice.</s>
  <s xml:id="echoid-s1131" xml:space="preserve"/>
</p>
<pb o="33" file="00039" n="39" rhead="_PRIMO_"/>
<p>
  <s xml:id="echoid-s1132" xml:space="preserve">_Matem._ </s>
  <s xml:id="echoid-s1133" xml:space="preserve">Io nonsõ tante coſe. </s>
  <s xml:id="echoid-s1134" xml:space="preserve">Sò bene, che chi dice che le parti <lb/>ſuperiori dell’acqua, anco ſtagnante, non grauitino ſopra <lb/>l’inferiori, contradice manifeſtiſſimamente ad Archimede-<lb/>Et acciò che queſto ſi conoſca, legga Signor Conte la ſua <lb/>dimoſtratione della _citata Prop. </s>
  <s xml:id="echoid-s1135" xml:space="preserve">5. </s>
  <s xml:id="echoid-s1136" xml:space="preserve">del Lib. </s>
  <s xml:id="echoid-s1137" xml:space="preserve">I. </s>
  <s xml:id="echoid-s1138" xml:space="preserve">de Inſidentibus bu_-<lb/>_mido._</s>
  <s xml:id="echoid-s1139" xml:space="preserve"/>
</p>
  <figure>
    <image file="00039-01" xlink:href="http://echo.mpiwg-berlin.mpg.de/zogilib?fn=/permanent/library/9EXVCG1R/figures/00039-01"/>
  </figure>
<p style="it">
  <s xml:id="echoid-s1140" xml:space="preserve">Conte. </s>
  <s xml:id="echoid-s1141" xml:space="preserve">Diſponantur (_dice egli_) eadem prioribus, &amp; </s>
  <s xml:id="echoid-s1142" xml:space="preserve">ſit bumidum non. <lb/></s>
  <s xml:id="echoid-s1143" xml:space="preserve">motum. </s>
  <s xml:id="echoid-s1144" xml:space="preserve">Sit autem magnitudo E I. </s>
  <s xml:id="echoid-s1145" xml:space="preserve">T H, leuior bumido. </s>
  <s xml:id="echoid-s1146" xml:space="preserve">Si igitur bumi-<lb/>dum eſt non motum, ſimiliter prementur partes ipſius ex xquo poſitæs <lb/>ſimiliter ergo premetur bumidum quod ſuperſiciebus, quæ ſecundùm <lb/>peripberias XO, P O. </s>
  <s xml:id="echoid-s1147" xml:space="preserve">Quare æqualis est grauitas qua premitur.</s>
  <s xml:id="echoid-s1148" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1149" xml:space="preserve">_Matem._ </s>
  <s xml:id="echoid-s1150" xml:space="preserve">Lo può dir più chiaro? </s>
  <s xml:id="echoid-s1151" xml:space="preserve">Quando adunque l’humido è <lb/>quieto, le Piramidi XKO, OKP ſono premute egualmente <lb/>dalli fruſti LXOM, MOPN. </s>
  <s xml:id="echoid-s1152" xml:space="preserve">ſeguiti Sig. </s>
  <s xml:id="echoid-s1153" xml:space="preserve">Conte.</s>
  <s xml:id="echoid-s1154" xml:space="preserve"/>
</p>
<p style="it">
  <s xml:id="echoid-s1155" xml:space="preserve">Conte. </s>
  <s xml:id="echoid-s1156" xml:space="preserve">Est autem &amp; </s>
  <s xml:id="echoid-s1157" xml:space="preserve">bumidi grauitas, quod in prima piramide ſine, <lb/>BHTG, ſolido æqualis grauitati bumidi quod in altera piramiáe ſine <lb/>RSCr, bumido: </s>
  <s xml:id="echoid-s1158" xml:space="preserve">palàm igitur, quod grauitas magnitudinis EZTH, eſt <lb/>æqualis grauitati bumidi RSCr.</s>
  <s xml:id="echoid-s1159" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1160" xml:space="preserve">_Matem._ </s>
  <s xml:id="echoid-s1161" xml:space="preserve">Ma l’acqua RSCY, non è poſta entro I’acqua? </s>
  <s xml:id="echoid-s1162" xml:space="preserve">E pure ſe-<lb/>condo Archimede peſa.</s>
  <s xml:id="echoid-s1163" xml:space="preserve"/>
</p>
<p style="it">
  <s xml:id="echoid-s1164" xml:space="preserve">ſont. </s>
  <s xml:id="echoid-s1165" xml:space="preserve">Manife ſtum igitur, quod tanta moles bumidi, quanta est demerſa
<pb o="34" file="00040" n="40" rhead="_DIALOGO_"/>
pars ſolidę magnitudinis, babet grauitatem æqualem toti magnitu-<lb/>dini.</s>
  <s xml:id="echoid-s1166" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1167" xml:space="preserve">_Matem._ </s>
  <s xml:id="echoid-s1168" xml:space="preserve">Ecco adunque; </s>
  <s xml:id="echoid-s1169" xml:space="preserve">che il galleggiante ET, poſto nell’acqua <lb/>equilibrato, e quieto, non perde, ſecondo Archimede, la <lb/>ſua grauità. </s>
  <s xml:id="echoid-s1170" xml:space="preserve">Di più notino, che queſto peſare egualmente <lb/>le grandezze, non viene conſiderato d’ Archimede fuori <lb/>del luogo, oue ſono, cioè ò in aria, ò altroue; </s>
  <s xml:id="echoid-s1171" xml:space="preserve">ma ſolamen-<lb/>te in quel preciſo luogo, che ſono, &amp; </s>
  <s xml:id="echoid-s1172" xml:space="preserve">in quanto ſono parti <lb/>delle piramidi LKM, MKN. </s>
  <s xml:id="echoid-s1173" xml:space="preserve">Di più notino, che non nomi-<lb/>na ne grauità aſſoluta, ne altro.</s>
  <s xml:id="echoid-s1174" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1175" xml:space="preserve">_Conte._ </s>
  <s xml:id="echoid-s1176" xml:space="preserve">Se le parti ſuperiori dell’ acqua non grauitaſſero ſopra <lb/>l’inferiori, parmi che molto meno douerebbe grauitare ſo-<lb/>pra la medem’acqua vna coſa più leggiera d’eſſa. </s>
  <s xml:id="echoid-s1177" xml:space="preserve">Ma queſta <lb/>grauita; </s>
  <s xml:id="echoid-s1178" xml:space="preserve">adunque anco la medem’acqua. </s>
  <s xml:id="echoid-s1179" xml:space="preserve">Mi dichiarò me-<lb/>glio. </s>
  <s xml:id="echoid-s1180" xml:space="preserve">Sia il ſettore FCL d’acqua, ſopra il quale ſia l’oglio <lb/>EFLH; </s>
  <s xml:id="echoid-s1181" xml:space="preserve">queſto certo grauitarà ſopra l’acqua. </s>
  <s xml:id="echoid-s1182" xml:space="preserve">Hora chi ſarà <lb/>quelio, che credà, che ſe in vece d’oglio ſi poneſſe acqua, <lb/>che queſta non grauitaſſe?</s>
  <s xml:id="echoid-s1183" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1184" xml:space="preserve">_Ofred._ </s>
  <s xml:id="echoid-s1185" xml:space="preserve">Il punto ſtà a dimoſtrare, che l’oglio EFLH, grauiti ſopra <lb/>l’acqua.</s>
  <s xml:id="echoid-s1186" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1187" xml:space="preserve">_Conte._ </s>
  <s xml:id="echoid-s1188" xml:space="preserve">Io credo che venga ciò dimoſtrato da vn’effetto natu-<lb/>rale, ch è queſto. </s>
  <s xml:id="echoid-s1189" xml:space="preserve">Nell’acqua ſia poſto il galleggiãte HMPN; <lb/></s>
  <s xml:id="echoid-s1190" xml:space="preserve">queſto s’immergerà in eſſa con la ſua parte LMPO, e nell’al-<lb/>tro ſettore s’alzerà l’acqua FGML. </s>
  <s xml:id="echoid-s1191" xml:space="preserve">Ma ſe ſopra infõderemo <lb/>oglio, di modo che AFLB, e BHND, ſiano ripieni d’oglio, <lb/>all’hora il galleggiante non ſtarà così, ma aſcenderà, di mo-<lb/>do che la parte immerſa nell acqua ſia minore della prima. </s>
  <s xml:id="echoid-s1192" xml:space="preserve"><lb/>LMPO el’HLON, maggiore. </s>
  <s xml:id="echoid-s1193" xml:space="preserve">E ſe in vece d’oglio infondeſ-<lb/>ſimo coſa più graue dell’oglio, ma più leggiera dell’ acqua, <lb/>ancora il ſolido HMPN, più galleggiarebbe nell’acqua; </s>
  <s xml:id="echoid-s1194" xml:space="preserve">e ſe <lb/>meno graue più s’immergerebbe, In ſomma ſe ſopra il gal-<lb/>leggiante, e l’acqua vi foſſe vacuo, la parte immerſa LMPO, <lb/>ſarebbe la maſſima. </s>
  <s xml:id="echoid-s1195" xml:space="preserve">Se aria, vn poco meno. </s>
  <s xml:id="echoid-s1196" xml:space="preserve">Se ſpirto di vi-<lb/>no aſſai meno. </s>
  <s xml:id="echoid-s1197" xml:space="preserve">Se oglio, ancora meno. </s>
  <s xml:id="echoid-s1198" xml:space="preserve">E così a proportio-<lb/>ne, ſecondo che più creſcono in grauità le materie ſopra po-<lb/>ſte. </s>
  <s xml:id="echoid-s1199" xml:space="preserve">Sino però che non foſſero, ò egualmente graui, ò più <lb/>graui in ſpecie del galleggiante; </s>
  <s xml:id="echoid-s1200" xml:space="preserve">perche nel primo caſo, que-<lb/>ſto vſcirebbe totalmente dall’ acqua, e nel confine d’eſſa, e
<pb o="35" file="00041" n="41" rhead="_PRIMO_."/>
del corpo ſoprapoſto ſi fermarebbe con la ſua inferior ſu-<lb/>perficie, e tutto immerſo ſtarebbe nel corpo ſoprapoſto; </s>
  <s xml:id="echoid-s1201" xml:space="preserve">e <lb/>nel ſecondo caſo ſallirebbe anco a galleggiar in eſſo.</s>
  <s xml:id="echoid-s1202" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1203" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s1204" xml:space="preserve">Queſt’è vn conſiderabile Fenomeno di natura; </s>
  <s xml:id="echoid-s1205" xml:space="preserve">ma come <lb/>V.</s>
  <s xml:id="echoid-s1206" xml:space="preserve">S. </s>
  <s xml:id="echoid-s1207" xml:space="preserve">vuole inferire che l’oglio, ò coſa più leggiera dell’acqua <lb/>grauiti ſopra eſſa?</s>
  <s xml:id="echoid-s1208" xml:space="preserve"/>
</p>
  <figure>
    <image file="00041-01" xlink:href="http://echo.mpiwg-berlin.mpg.de/zogilib?fn=/permanent/library/9EXVCG1R/figures/00041-01"/>
  </figure>
<p>
  <s xml:id="echoid-s1209" xml:space="preserve">_Conte_. </s>
  <s xml:id="echoid-s1210" xml:space="preserve">Io di queſt’ effetto non ſaprei aſſegnar altra cagione, ſe <lb/>non che quando ſopra il gallegiante, e l’acqua vi foſse va-<lb/>cuo, tanto grauitaſſe il galleggiante HMPN, quanto l’acqua <lb/>FGML eguale alla parte immerſa. </s>
  <s xml:id="echoid-s1211" xml:space="preserve">Ma quando ſopra vi foſ-<lb/>ſe, ò oglio, ò altro fluido, tanto doueſſe grauitare il galleg-<lb/>giante, quanto l’acqua FGML, eguale alla parte immerſa, <lb/>inſieme con il fluido EFLH, eguale alla parte fuori dell’ac-<lb/>qua: </s>
  <s xml:id="echoid-s1212" xml:space="preserve">onde ſecondo la grauità dell’oglio, ò d’altro fluido ſo-<lb/>prapoſto, doueſse ſcemarſi, ò creſcer l’FGML. </s>
  <s xml:id="echoid-s1213" xml:space="preserve">Ilche non ſi <lb/>fa, che ſcendendo l’acqua, e ſalendo il galleggiante. </s>
  <s xml:id="echoid-s1214" xml:space="preserve">E parmi <lb/>che la natura inſegni, che così, e non altrimenti poſſi eſse-<lb/>re. </s>
  <s xml:id="echoid-s1215" xml:space="preserve">Sia ſopra l’acqua, &amp; </s>
  <s xml:id="echoid-s1216" xml:space="preserve">il galleggiante vacuo; </s>
  <s xml:id="echoid-s1217" xml:space="preserve">tanto grauita-<lb/>rà l’acqua FGML, quanto il galleggiante HMPN. </s>
  <s xml:id="echoid-s1218" xml:space="preserve">Sopra l’-
<pb o="36" file="00042" n="42" rhead="_DIALOGO_"/>
acqua s’infondi l’oglio EFLH; </s>
  <s xml:id="echoid-s1219" xml:space="preserve">pare ragioneuole, che que <lb/>ſtocon l’acqua FGML, debba più grauitare, che la ſola ac-<lb/>qua FGML; </s>
  <s xml:id="echoid-s1220" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s1221" xml:space="preserve">in conſeguenza, più che il galleggiante HM-<lb/>PN. </s>
  <s xml:id="echoid-s1222" xml:space="preserve">Onde lo farà ſalire fino che li momenti s’equilibrino. </s>
  <s xml:id="echoid-s1223" xml:space="preserve">In <lb/>ſomma l’effetto è certiſſimo. </s>
  <s xml:id="echoid-s1224" xml:space="preserve">Ne io d’eſso ſaprei aſsegnar <lb/>altra cauſa; </s>
  <s xml:id="echoid-s1225" xml:space="preserve">che queſta.</s>
  <s xml:id="echoid-s1226" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1227" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s1228" xml:space="preserve">Se così è, V. </s>
  <s xml:id="echoid-s1229" xml:space="preserve">S. </s>
  <s xml:id="echoid-s1230" xml:space="preserve">ſarà dell’opinione del dottiſſimo Sig. </s>
  <s xml:id="echoid-s1231" xml:space="preserve">Dona-<lb/>to Roſsetti, il quale _nelle ſue dimoſtrationi Fiſicomat. </s>
  <s xml:id="echoid-s1232" xml:space="preserve">cart. </s>
  <s xml:id="echoid-s1233" xml:space="preserve">3_. <lb/></s>
  <s xml:id="echoid-s1234" xml:space="preserve">dice. </s>
  <s xml:id="echoid-s1235" xml:space="preserve">_Il concetto d’ Archimede, che il galleggiante ſi ſommerga ſot_-<lb/>_to il liuello dell’ acqua, fin tanto che vna mole d’acqua eguale alla_ <lb/>_parte ſommerſa, peſi aſſolutamente quanto tutto il galleggiante, è_ <lb/>_falſiſſimo_. </s>
  <s xml:id="echoid-s1236" xml:space="preserve">E ſegue a dire, che la ſua propoſitione è vera, quan-<lb/>do ſopra l’a cqua, e galleggiante vi è vacuo, ma non quando <lb/>viè aria; </s>
  <s xml:id="echoid-s1237" xml:space="preserve">perche all’hora quanto peſa il galleggiante, tanto <lb/>peſa vna mole d’acqua eguale alla parte immerſa, inſieme <lb/>con vna mole d’aria eguale alla parte eſtante.</s>
  <s xml:id="echoid-s1238" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1239" xml:space="preserve">_Conte_. </s>
  <s xml:id="echoid-s1240" xml:space="preserve">Io non voglio ricercare, che coſa intendeſſe Archime-<lb/>de. </s>
  <s xml:id="echoid-s1241" xml:space="preserve">Sò bene che quanto dice il Signor Roſſetti, mi par vero; <lb/></s>
  <s xml:id="echoid-s1242" xml:space="preserve">e facilmente m’induco a credere, che Archimede alla groſ-<lb/>ſa caminaſſe con I’opinione di quelli, che ſtimauano la no-<lb/>ſtra aria poſitinamente leggiera. </s>
  <s xml:id="echoid-s1243" xml:space="preserve">Che per altro io ſtimo, che <lb/>la grauita aſſoluta d’vn graue non ſia quella, che ſentiamo <lb/>nell’aria, ò in altro mezzo pieno, ma quella che ſentireſſi-<lb/>mo nel vuoto.</s>
  <s xml:id="echoid-s1244" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1245" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s1246" xml:space="preserve">In gratia Sig. </s>
  <s xml:id="echoid-s1247" xml:space="preserve">Conte non corra così precipitoſo in con-<lb/>dannar Archimede. </s>
  <s xml:id="echoid-s1248" xml:space="preserve">Chisà, che di quel Fenomeno di natu-<lb/>ra non ſia più toſto cauſa vna certa, per coſi dire, leggie-<lb/>rezza, ò grauità minore eſsercitata nell’ acqua? </s>
  <s xml:id="echoid-s1249" xml:space="preserve">Primiera-<lb/>mente vorrei, che conſideraſſimo, che Archimede non no-<lb/>mina mai grauità aſſoluta, ò altro, ma ſolo, come ſi vede <lb/>manifeſtamente dalla ſua propoſitione ſoprapoſta, conſide-<lb/>ra la grauità, ch’eſsercita il galleggiante, come immerſo nel-<lb/>l’acqua, e nel modo che ſta. </s>
  <s xml:id="echoid-s1250" xml:space="preserve">Secondariamente vorrei Signot <lb/>Ofredi, che eſſa mi diceſse, ſe eſsẽdo il galleggiante HMPN, <lb/>immerſo con la parte LMPO, e ſopra eſſo vi foſſe vacuo, ſe <lb/>alcuno l’alzaſſe dall’acqua, ma non totalmente, ſi che la <lb/>parte immerſa foſse minore del LMPO, ſe queſti ſentiſſe la <lb/>grauità aſsoluta del galleggiante, ò parte?</s>
  <s xml:id="echoid-s1251" xml:space="preserve"/>
</p>
<pb o="37" file="00043" n="43" rhead="_PRIMO_."/>
<p>
  <s xml:id="echoid-s1252" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s1253" xml:space="preserve">Io credo che ne ſentiſse parte, e che l’altra ſoſse con-<lb/>trapeſata dalla parte dell’ acqua FGML, eguale alla parte <lb/>ſommerſa.</s>
  <s xml:id="echoid-s1254" xml:space="preserve"/>
</p>
  <figure>
    <image file="00043-01" xlink:href="http://echo.mpiwg-berlin.mpg.de/zogilib?fn=/permanent/library/9EXVCG1R/figures/00043-01"/>
  </figure>
<p>
  <s xml:id="echoid-s1255" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s1256" xml:space="preserve">In queſto caſo non potreſſimo dire, che tanto grauitaſ-<lb/>ſe quella parte dell’acqua FGML, quanto nell’ acqua il gal-<lb/>leggiante HMPN?</s>
  <s xml:id="echoid-s1257" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1258" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s1259" xml:space="preserve">Non voglio dire che ciò non ſia.</s>
  <s xml:id="echoid-s1260" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1261" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s1262" xml:space="preserve">Mò s’imagini V. </s>
  <s xml:id="echoid-s1263" xml:space="preserve">S. </s>
  <s xml:id="echoid-s1264" xml:space="preserve">che il medemo, in certo modo, in-<lb/>trauenga al galleggiante, quando ſopra eſso ſi pone, ò aria, <lb/>ò oglio, ò altro fluido più leggiero d’eſſo, e dell’acqua. </s>
  <s xml:id="echoid-s1265" xml:space="preserve">E per <lb/>intelligenza di queſto, ſupponga V. </s>
  <s xml:id="echoid-s1266" xml:space="preserve">S. </s>
  <s xml:id="echoid-s1267" xml:space="preserve">che il galleggiante ſia <lb/>di materia egualmente graue in ſpecie con l’oglio, che ſup-<lb/>poniamo ſoprapoſto. </s>
  <s xml:id="echoid-s1268" xml:space="preserve">Queſto grauitarà ſopra l’acqua, mà in <lb/>niun conto s’immergerà in eſſa, benche ſia di materla ſoda <lb/>(come s’immergerebbe altro galleggiante anco aſsai più <lb/>leggiero in ſpecie di quello, quando ſopra eſſo non vi foſſe <lb/>oglio.) </s>
  <s xml:id="echoid-s1269" xml:space="preserve">Hora io vorrei che V. </s>
  <s xml:id="echoid-s1270" xml:space="preserve">S. </s>
  <s xml:id="echoid-s1271" xml:space="preserve">mi diceſſe, perche non s’ini-<lb/>merge il galleggiante punto nell’ acqua? </s>
  <s xml:id="echoid-s1272" xml:space="preserve">Forſe non gra-<lb/>uita?</s>
  <s xml:id="echoid-s1273" xml:space="preserve"/>
</p>
<pb o="38" file="00044" n="44" rhead="_DIALOGO_"/>
<p>
  <s xml:id="echoid-s1274" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s1275" xml:space="preserve">Grauita; </s>
  <s xml:id="echoid-s1276" xml:space="preserve">ma eſſendo della medema grauità con I’oglio, <lb/>queſto l’equilibra, &amp; </s>
  <s xml:id="echoid-s1277" xml:space="preserve">in vn certo modo, quaſi direi li leua la <lb/>grauità: </s>
  <s xml:id="echoid-s1278" xml:space="preserve">onde e ſsendo li loro momenti eguali, ne l’vno, ne <lb/>I’altro può ſcendere, &amp; </s>
  <s xml:id="echoid-s1279" xml:space="preserve">eſsercitare l’effetto della grauità.</s>
  <s xml:id="echoid-s1280" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1281" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s1282" xml:space="preserve">Bene, bene. </s>
  <s xml:id="echoid-s1283" xml:space="preserve">Non ſi può adunque dire con giuſta verità, <lb/>che il galleggiante è trattenuto dall’oglio, acciò non diſcen-<lb/>da in conto alcuno nell’acqua? </s>
  <s xml:id="echoid-s1284" xml:space="preserve">Non ſi può dire veridicamẽ-<lb/>te, che il galleggiante nulla grauiti entro l’acqua, quantun-<lb/>que grauiti ſopra eſsa?</s>
  <s xml:id="echoid-s1285" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1286" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s1287" xml:space="preserve">E bene coſa vuole inferire?</s>
  <s xml:id="echoid-s1288" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1289" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s1290" xml:space="preserve">Hor hora lo ſentirà. </s>
  <s xml:id="echoid-s1291" xml:space="preserve">Conſideriamo il galleggiante di-<lb/>uenuto vn poco più graue in ſpecie dell’oglio, e meno dell’-<lb/>acqua, ma che vno lo teneſse, che grauità ſentiria egli?</s>
  <s xml:id="echoid-s1292" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1293" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s1294" xml:space="preserve">Queſti ſecondo la più volte citata _propoſit. </s>
  <s xml:id="echoid-s1295" xml:space="preserve">7. </s>
  <s xml:id="echoid-s1296" xml:space="preserve">d’ Archime-_ <lb/>_de_ ſentirà il ſolo ecceſſo della grauità ſua, ſopra quella della <lb/>mole dell’oglio EGMH, ad eſso eguale, mentre nell’oglio è <lb/>più leggiero di quanto peſa queſta mole d’oglio.</s>
  <s xml:id="echoid-s1297" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1298" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s1299" xml:space="preserve">E ſe lo laſciarà, che ſarà?</s>
  <s xml:id="echoid-s1300" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1301" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s1302" xml:space="preserve">S’immergerà v. </s>
  <s xml:id="echoid-s1303" xml:space="preserve">g. </s>
  <s xml:id="echoid-s1304" xml:space="preserve">con la parte LMPO.</s>
  <s xml:id="echoid-s1305" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1306" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s1307" xml:space="preserve">Mà la parte HLON, non è immerſa nell’oglio, &amp; </s>
  <s xml:id="echoid-s1308" xml:space="preserve">in con-<lb/>ſeguenza non è reſa più leggiera?</s>
  <s xml:id="echoid-s1309" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1310" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s1311" xml:space="preserve">Non sò dire di nò,</s>
</p>
<p>
  <s xml:id="echoid-s1312" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s1313" xml:space="preserve">Tanto adunque che in parte il galleggiante, accioche <lb/>non diſcenda, e trattenuto dall’oglio, che lo fa più leggiero. <lb/></s>
  <s xml:id="echoid-s1314" xml:space="preserve">Mà che altro lo trattiene?</s>
  <s xml:id="echoid-s1315" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1316" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s1317" xml:space="preserve">Direi che foſse l’acqua FGML.</s>
  <s xml:id="echoid-s1318" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1319" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s1320" xml:space="preserve">Ecco adunque Sig. </s>
  <s xml:id="echoid-s1321" xml:space="preserve">Ofredi, che il momento del galleg-<lb/>giante è pareggiato da due cauſe; </s>
  <s xml:id="echoid-s1322" xml:space="preserve">dall’oglio che lo fa in par-<lb/>te più leggiero, e dall’acqua FGML, che eſsendo eguale alla <lb/>parte immerſa, pareggia il momento, che eſercita il galleg-<lb/>giante nell’acqua. </s>
  <s xml:id="echoid-s1323" xml:space="preserve">Si che ſempre è vero il concetto d’Archi-<lb/>mede, che la mole d’acqua eguale alla parte immerſa, pa-<lb/>reggia il momento, che eſercita il gallegiante entro l’acqua. <lb/></s>
  <s xml:id="echoid-s1324" xml:space="preserve">E perche quanto è più graue il fluido ſoprapoſto, tanto più <lb/>queſto rende leggiera la parte eſtante; </s>
  <s xml:id="echoid-s1325" xml:space="preserve">quindi è, che il gal-<lb/>leggiante ſempre meno s’immerge, quanto più quel fluido <lb/>è graue.</s>
  <s xml:id="echoid-s1326" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1327" xml:space="preserve">_Conte_. </s>
  <s xml:id="echoid-s1328" xml:space="preserve">Non però la parte d’acqua eguale alla parte immerſa
<pb o="39" file="00045" n="45" rhead="_PRIMO_."/>
grauita aſſolutamente ſempre quanto tutto il galleggiante; <lb/></s>
  <s xml:id="echoid-s1329" xml:space="preserve">mà ben queſta con vna mole di fluido ſoprapoſta eguale <lb/>alla parte eſtante.</s>
  <s xml:id="echoid-s1330" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1331" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s1332" xml:space="preserve">Q@eſt’è ben vero: </s>
  <s xml:id="echoid-s1333" xml:space="preserve">ma non dobbiamo precipitoſamente <lb/>dire, che Archimede habbia inteſo così, mentre come hab-<lb/>biamo veduto, mai nomina grauità aſsoluta, ò altro. </s>
  <s xml:id="echoid-s1334" xml:space="preserve">Si vol-<lb/>tino queſte ragioni contro chi diceſse que llo, che non dice <lb/>Archimede, cioè che peſaſſero egualmente anco aſſoluta-<lb/>mente.</s>
  <s xml:id="echoid-s1335" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1336" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s1337" xml:space="preserve">Orsù ſia come eſſer ſi voglia, io tengo certiſſimamente, <lb/>che le parti ſuperiori dell’acqua premino ſopra l’inferiori, è <lb/>che tutte le coſe graui ſempre grauitino in tutti li luoghi, è <lb/>mezzi. </s>
  <s xml:id="echoid-s1338" xml:space="preserve">Onde credo che infiniti equilibrij, che vediamo non <lb/>na ſchino, che da queſte preſſioni, è che di molti effetti, que-<lb/>ſte ſiano le vere cagioni. </s>
  <s xml:id="echoid-s1339" xml:space="preserve">Mà Sig. </s>
  <s xml:id="echoid-s1340" xml:space="preserve">Profeſſore fa tardi; </s>
  <s xml:id="echoid-s1341" xml:space="preserve">e l’aria <lb/>della notte in Padoua non è troppo buona per queſti male-<lb/>detti chi và lì.</s>
  <s xml:id="echoid-s1342" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1343" xml:space="preserve">_Conte_. </s>
  <s xml:id="echoid-s1344" xml:space="preserve">Non dubiti Sig. </s>
  <s xml:id="echoid-s1345" xml:space="preserve">Ofredi, ch’è ancora à buon’hora. </s>
  <s xml:id="echoid-s1346" xml:space="preserve">E poi <lb/>non biſognaua principiare queſti diſcorſi, chi non voleua <lb/>finirli. </s>
  <s xml:id="echoid-s1347" xml:space="preserve">Io certa mente non intendo che partino da me, ſe <lb/>prima non ſi sbrighiamo dal Dottiſſimo P. </s>
  <s xml:id="echoid-s1348" xml:space="preserve">Paolo Caſati <lb/>Geſuita.</s>
  <s xml:id="echoid-s1349" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1350" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s1351" xml:space="preserve">In verità che V. </s>
  <s xml:id="echoid-s1352" xml:space="preserve">S. </s>
  <s xml:id="echoid-s1353" xml:space="preserve">Hà ragione. </s>
  <s xml:id="echoid-s1354" xml:space="preserve">Io me l’ero ſcordato. </s>
  <s xml:id="echoid-s1355" xml:space="preserve">Toc-<lb/>ca a lei Sig. </s>
  <s xml:id="echoid-s1356" xml:space="preserve">Profeſſore che n’è informata, parteciparne le <lb/>ſue dottrine.</s>
  <s xml:id="echoid-s1357" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1358" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s1359" xml:space="preserve">Ne è bene informato anco il Sig. </s>
  <s xml:id="echoid-s1360" xml:space="preserve">Conte che vedo hauer <lb/>il ſuo libro, che farà gratia di porgermelo. </s>
  <s xml:id="echoid-s1361" xml:space="preserve">Deue adunque ſa-<lb/>pere Sig. </s>
  <s xml:id="echoid-s1362" xml:space="preserve">Ofredi, che il P. </s>
  <s xml:id="echoid-s1363" xml:space="preserve">Caſati in queſto ſuo ammirabile li-<lb/>bro intitolato _Terra Machinis mota, nel principio della 5. </s>
  <s xml:id="echoid-s1364" xml:space="preserve">Diſſer_-<lb/>_tatione_ intro duce l interl ocutore Guldino a narrare tutta la <lb/>ſerie dell’eſperienza del recipiente del Sig. </s>
  <s xml:id="echoid-s1365" xml:space="preserve">Gerickio appun-<lb/>to come è deſcritta dal P. </s>
  <s xml:id="echoid-s1366" xml:space="preserve">Scotti; </s>
  <s xml:id="echoid-s1367" xml:space="preserve">qual recitata, fà che l’altro <lb/>interlocutore Merſenno interroghi il Guldino così. </s>
  <s xml:id="echoid-s1368" xml:space="preserve">_Et du_-<lb/>_bitabis adhuc, an aeri vas implenti tribuendũ eſſet pondus, quod aere_ <lb/>_extracto defuit? </s>
  <s xml:id="echoid-s1369" xml:space="preserve">Tibi certe non idſtipularentur quicunque liquorem_, <lb/>_puta oleum, aut mel, ad libram vendunt; </s>
  <s xml:id="echoid-s1370" xml:space="preserve">quæ enim inter vas plenum_, <lb/>_ac vacuum differentia ponderum intercedit, eam liquori tribuendam_ <lb/>_nemo negat_.</s>
  <s xml:id="echoid-s1371" xml:space="preserve"/>
</p>
<pb o="40" file="00046" n="46" rhead="DIALOGO"/>
<p>
  <s xml:id="echoid-s1372" xml:space="preserve">Dopòle quali parole fà che il Guldino interroghi pure il Mer-<lb/>ſenno. </s>
  <s xml:id="echoid-s1373" xml:space="preserve">_Sed quid ſi vas in aquam expenderent nunc quidem melle_ <lb/>_nunc vero aere plenum? </s>
  <s xml:id="echoid-s1374" xml:space="preserve">an grauitatum differentiam ita melli tri-_ <lb/>_bueres, vt velles pro ea pretium ſoluere?_ </s>
  <s xml:id="echoid-s1375" xml:space="preserve">Alla quale interogatio-<lb/>ne troppodubioſo d’eſſer gabbato, convn _Minimè omnium_, <lb/>riſponde il Merſenno poco bene, per mio credere. </s>
  <s xml:id="echoid-s1376" xml:space="preserve">Poiche <lb/>facendoſi queſti peſi, e nell’aria, e nell’acqua, ſempre ſi tro-<lb/>uarà la medema differenza; </s>
  <s xml:id="echoid-s1377" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s1378" xml:space="preserve">in conſeguenza che l’oglio <lb/>peſi il medemo. </s>
  <s xml:id="echoid-s1379" xml:space="preserve">E per conoſcer queſto, ricorriamo al no-<lb/>ſtro eſempio del vaſo d’oro poſto a carte 23.</s>
  <s xml:id="echoid-s1380" xml:space="preserve">, il quale peſa-<lb/>to in aria in pezzo, ò formato in vaſo peſaua libre 100. </s>
  <s xml:id="echoid-s1381" xml:space="preserve">In. <lb/></s>
  <s xml:id="echoid-s1382" xml:space="preserve">acqua peſaua libre 95. </s>
  <s xml:id="echoid-s1383" xml:space="preserve">e pieno d’aria, &amp; </s>
  <s xml:id="echoid-s1384" xml:space="preserve">otturato, libre 93. </s>
  <s xml:id="echoid-s1385" xml:space="preserve"><lb/>Supponiamo che queſto riempito di mielle in aria peſi libre <lb/>101. </s>
  <s xml:id="echoid-s1386" xml:space="preserve">ſi che il mielle ſia in grauità ſubdupla dell’acqua. </s>
  <s xml:id="echoid-s1387" xml:space="preserve">Già il <lb/>Merſenno non hauerà ſcrupolo, che peſato in aria il vaſo <lb/>pieno di mielle, e vuoto, e ritrouata la differenza d’vna li-<lb/>bra, che ſia il peſo del mielle; </s>
  <s xml:id="echoid-s1388" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s1389" xml:space="preserve">in queſto modo ſi conten-<lb/>tarà di pagaril prezzo. </s>
  <s xml:id="echoid-s1390" xml:space="preserve">Ma ſe queſta medema differenza d’v-<lb/>na libra ſe ritrouarà peſando nell’acqua, perche non la vorrà <lb/>pagare?</s>
  <s xml:id="echoid-s1391" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1392" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s1393" xml:space="preserve">Sì ſe ſarà la medema. </s>
  <s xml:id="echoid-s1394" xml:space="preserve">Ma dubito che non ſia molto <lb/>maggiore.</s>
  <s xml:id="echoid-s1395" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1396" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s1397" xml:space="preserve">Non certo. </s>
  <s xml:id="echoid-s1398" xml:space="preserve">Perche il vaſo pieno d’aria nell’acqua peſa-<lb/>ua libre 93. </s>
  <s xml:id="echoid-s1399" xml:space="preserve">mentre la mole dell’ acqua eguale all’aggregato <lb/>peſaua libre 7. </s>
  <s xml:id="echoid-s1400" xml:space="preserve">Ma pur queſte 7. </s>
  <s xml:id="echoid-s1401" xml:space="preserve">libre leuarà dall’aggregato <lb/>del vaſo, e del mielle; </s>
  <s xml:id="echoid-s1402" xml:space="preserve">ſi che eſſendo queſte libre 101. </s>
  <s xml:id="echoid-s1403" xml:space="preserve">reſta. <lb/></s>
  <s xml:id="echoid-s1404" xml:space="preserve">ranno libre 94. </s>
  <s xml:id="echoid-s1405" xml:space="preserve">onde vna libra pure ſara il mielle; </s>
  <s xml:id="echoid-s1406" xml:space="preserve">e la diffe-<lb/>renza trouata nell’aria, e nell’acqua ſarà la medema.</s>
  <s xml:id="echoid-s1407" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1408" xml:space="preserve">_Conte_. </s>
  <s xml:id="echoid-s1409" xml:space="preserve">Ma V. </s>
  <s xml:id="echoid-s1410" xml:space="preserve">S. </s>
  <s xml:id="echoid-s1411" xml:space="preserve">legga la ragione, che aſſegna del _minimè ominum_.</s>
  <s xml:id="echoid-s1412" xml:space="preserve"/>
</p>
<p style="it">
  <s xml:id="echoid-s1413" xml:space="preserve">Matem. </s>
  <s xml:id="echoid-s1414" xml:space="preserve">_Eccola_. </s>
  <s xml:id="echoid-s1415" xml:space="preserve">Quia prater mellis pondus ſublatum, etiam de vaſis <lb/>grauitate non parum demeret incluſi aeris leuitas.</s>
  <s xml:id="echoid-s1416" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1417" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s1418" xml:space="preserve">Da queſte parole ſi vede manifeſtamente, che egli pen-<lb/>ſa, che l aria aggiunga leggierezza al vaſo; </s>
  <s xml:id="echoid-s1419" xml:space="preserve">che perciò mag-<lb/>gior differenza ſi douerebbe ritrouare peſando in acqua, <lb/>che peſando in aria; </s>
  <s xml:id="echoid-s1420" xml:space="preserve">il che ſopra è ſtato prouato eſſer falſo.</s>
  <s xml:id="echoid-s1421" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1422" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s1423" xml:space="preserve">Mò ſentino quello anco, che loggiunge il Guldino. <lb/></s>
  <s xml:id="echoid-s1424" xml:space="preserve">_Quid ni igitur vaſis grauitati detractum pariter aſſeras ab incluſo_ <lb/>_aere maximè raro, ac proindè longè leuiore, quam aer iſte commu-_
<pb o="41" file="00047" n="47" rhead="PRIMO."/>
_nis?_ </s>
  <s xml:id="echoid-s1425" xml:space="preserve">Ecco adunque che il Guldino dubita, ò per meglio dire <lb/>penſa, che la maggior leggierezza nel recipiente euacuato, <lb/>che pieno, naſca, non dall’aſſenza dell’aria eſtratta, ma dalla <lb/>maggior leggierezza poſitiua dell’aria rachiuſa nel vaſo, aſ-<lb/>ſai più leggiera della comune.</s>
  <s xml:id="echoid-s1426" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1427" xml:space="preserve">Non sò poi vedere come con verità inferiſca quanto ſoggiun-<lb/>ge. </s>
  <s xml:id="echoid-s1428" xml:space="preserve">_Ex quo illud vnum conficitur, quod vltro dò, aerem ſcilicet no-_ <lb/>_ſtrum futurum grauem, ſi phialæ incluſus trasfereretur in aerem ra-_ <lb/>_riſſimum &amp; </s>
  <s xml:id="echoid-s1429" xml:space="preserve">in eodem medio eſſet æquipodium, quo aeris communis_ <lb/>_grauitas exploraretur_.</s>
  <s xml:id="echoid-s1430" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1431" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s1432" xml:space="preserve">Tutta queſta dottrina mi par veriſſima, ma non già ſola; <lb/></s>
  <s xml:id="echoid-s1433" xml:space="preserve">poiche anco è vero, che la noſtra aria grauita, ein vna ſimi-<lb/>le ad eſſa, e in vna più graue. </s>
  <s xml:id="echoid-s1434" xml:space="preserve">Nella più leggiera, qual foſſe <lb/>quella del recipiente, ſarebbe anco tanto graue, che diſcen-<lb/>derebbe.</s>
  <s xml:id="echoid-s1435" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1436" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s1437" xml:space="preserve">Non credo adunque che habbia ragione di dire con tan-<lb/>ta certezza, &amp; </s>
  <s xml:id="echoid-s1438" xml:space="preserve">aſſeueranza a carte 171. </s>
  <s xml:id="echoid-s1439" xml:space="preserve">_Hoc itaque experimento_ <lb/>_non ſatis probari noſtri aeris grauitatem abſolutè, mibi certiſſimũ eſt_.</s>
  <s xml:id="echoid-s1440" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1441" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s1442" xml:space="preserve">Hà fatto bene a poner quel _mihi_, perche a noi certo non <lb/>è così.</s>
  <s xml:id="echoid-s1443" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1444" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s1445" xml:space="preserve">Ne meno parmi, che habbia ragione di replicare. </s>
  <s xml:id="echoid-s1446" xml:space="preserve">_Sed_ <lb/>_illud vnum ex inæquali Recipientis pondere ante, ac poſt aeris extra-_ <lb/>_ctionem vi anthliæ, confici poteſt, quod non inficior, ſcilicet cõmunem_ <lb/>_hunc nostrum aerem in aere alio magis raro grauitare poſſe_. </s>
  <s xml:id="echoid-s1447" xml:space="preserve">Perche <lb/>grauita, e nel più raro, e nel raro egualmente, e nel più den-<lb/>ſo; </s>
  <s xml:id="echoid-s1448" xml:space="preserve">ſe bene poi non pregrauita, e diſcende che nel primo. </s>
  <s xml:id="echoid-s1449" xml:space="preserve">Ma <lb/>fà tardi da douero. </s>
  <s xml:id="echoid-s1450" xml:space="preserve">Andiamo adunque, con laſciar la buona <lb/>notte al Sig. </s>
  <s xml:id="echoid-s1451" xml:space="preserve">Conte, a ca ſa. </s>
  <s xml:id="echoid-s1452" xml:space="preserve">Dimani voglio che ritorniamo <lb/>quà, ſe però così li piace, perche non hò fornito di dire <lb/>quanto haueuo in animo ſopra le preſſioni de liquidi.</s>
  <s xml:id="echoid-s1453" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1454" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s1455" xml:space="preserve">Non parta di caſa ſenza me, che ſarò a leuarla.</s>
  <s xml:id="echoid-s1456" xml:space="preserve"/>
</p>
</div>
<div xml:id="echoid-div9" type="section" level="1" n="7">
<head xml:id="echoid-head6" xml:space="preserve">Fine del Primo Dialogo.</head>
<pb o="42" file="00048" n="48"/>
</div>
<div xml:id="echoid-div10" type="section" level="1" n="8">
<head xml:id="echoid-head7" xml:space="preserve">DIALOGO <lb/>SECONDO.</head>
  <figure>
    <image file="00048-01" xlink:href="http://echo.mpiwg-berlin.mpg.de/zogilib?fn=/permanent/library/9EXVCG1R/figures/00048-01"/>
  </figure>
<p>
  <s xml:id="echoid-s1457" xml:space="preserve">M _Atem_. </s>
  <s xml:id="echoid-s1458" xml:space="preserve">Che bel Libro Sig. </s>
  <s xml:id="echoid-s1459" xml:space="preserve">Ofredi è quello, <lb/>che tiene ſotto il braccio? </s>
  <s xml:id="echoid-s1460" xml:space="preserve">Biſogna certo <lb/>che contenga dottrine molto da lei ſti-<lb/>mate, mentre vedo che lo cuſtodiſſe con <lb/>tanta diligenza. </s>
  <s xml:id="echoid-s1461" xml:space="preserve">La curioſità de diman-<lb/>darle del Libro, mi hà fatto ſcordare del-<lb/>la ciuiltà de riuerirla.</s>
  <s xml:id="echoid-s1462" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1463" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s1464" xml:space="preserve">Io pure riueriſco V. </s>
  <s xml:id="echoid-s1465" xml:space="preserve">S. </s>
  <s xml:id="echoid-s1466" xml:space="preserve">e la prego <lb/>che andiamo quanto prima a ritrouare il <lb/>Sig. </s>
  <s xml:id="echoid-s1467" xml:space="preserve">Conte, perche il deſiderio, che hò d’auertire V. </s>
  <s xml:id="echoid-s1468" xml:space="preserve">S. </s>
  <s xml:id="echoid-s1469" xml:space="preserve">di <lb/>certo ſuo errore, che mi ha fatto conoſcere queſto Libro, <lb/>mi fa parere ogni momento di tempo, vn ſecolo. </s>
  <s xml:id="echoid-s1470" xml:space="preserve">Il Libro è <lb/>del Sig. </s>
  <s xml:id="echoid-s1471" xml:space="preserve">_Andrea Van Berlicom;_ </s>
  <s xml:id="echoid-s1472" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s1473" xml:space="preserve">è diſtinto in 12. </s>
  <s xml:id="echoid-s1474" xml:space="preserve">Libretti, &amp; </s>
  <s xml:id="echoid-s1475" xml:space="preserve">il <lb/>ſuo titolo è _Elementorum de rerum natur alium granitate, &amp;</s>
  <s xml:id="echoid-s1476" xml:space="preserve">c_.</s>
  <s xml:id="echoid-s1477" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1478" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s1479" xml:space="preserve">Il Sig. </s>
  <s xml:id="echoid-s1480" xml:space="preserve">Conte mi ha fatto ſapere per vn ſuo ſeruitore. <lb/></s>
  <s xml:id="echoid-s1481" xml:space="preserve">che ſarà quà a caſa mia. </s>
  <s xml:id="echoid-s1482" xml:space="preserve">Eccolo appunto che viene molto <lb/>in freta. </s>
  <s xml:id="echoid-s1483" xml:space="preserve">Sig. </s>
  <s xml:id="echoid-s1484" xml:space="preserve">Conte la riueriamo; </s>
  <s xml:id="echoid-s1485" xml:space="preserve">e ſi contenti di queſti bre-<lb/>ui complimenti, perche io viuo molto ſollecito d’eſſer leua-<lb/>to dal Sig. </s>
  <s xml:id="echoid-s1486" xml:space="preserve">Ofredi, mediante il Libro, che tiene in mano, che <lb/>è del Sig. </s>
  <s xml:id="echoid-s1487" xml:space="preserve">Van Berlicom, d’vn mio errore. </s>
  <s xml:id="echoid-s1488" xml:space="preserve">Preſto in gratia <lb/>Sig. </s>
  <s xml:id="echoid-s1489" xml:space="preserve">Ofredi me lo facia vedere.</s>
  <s xml:id="echoid-s1490" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1491" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s1492" xml:space="preserve">Accomodia moci prima. </s>
  <s xml:id="echoid-s1493" xml:space="preserve">Hieri V. </s>
  <s xml:id="echoid-s1494" xml:space="preserve">S. </s>
  <s xml:id="echoid-s1495" xml:space="preserve">in materia di peſa-<lb/>reha eſemplificato e _à carte 23. </s>
  <s xml:id="echoid-s1496" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s1497" xml:space="preserve">à car ts_ 40. </s>
  <s xml:id="echoid-s1498" xml:space="preserve">ſopra d’vn pezzo <lb/>d’oro prima raccolto in sfera, ò altro corpo, che non haueſſe <lb/>cauità, e poi formato in vn vaſo, qual’oro peſaſſe fuori d’ac-<lb/>qua Libre 100. </s>
  <s xml:id="echoid-s1499" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s1500" xml:space="preserve">in eſſa 95. </s>
  <s xml:id="echoid-s1501" xml:space="preserve">e tanto ha ſuppoſto peſare in <lb/>ambidue le forme. </s>
  <s xml:id="echoid-s1502" xml:space="preserve">Hora V. </s>
  <s xml:id="echoid-s1503" xml:space="preserve">S. </s>
  <s xml:id="echoid-s1504" xml:space="preserve">non hà oſſeruato, che ſe l’oro <lb/>ridotto in sfera peſarà in aria Libre 100. </s>
  <s xml:id="echoid-s1505" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s1506" xml:space="preserve">in acqua 95. </s>
  <s xml:id="echoid-s1507" xml:space="preserve">ri.</s>
  <s xml:id="echoid-s1508" xml:space="preserve">
<pb o="43" file="00049" n="49" rhead="SECONDO."/>
dotto in qual ſi ſia altra figura, mentre che di neceffità que-<lb/>ſta ſarà maggiore, peſarà ſempre meno? </s>
  <s xml:id="echoid-s1509" xml:space="preserve">Di queſto ſuo in-<lb/>auertimento m’ha fatto accorgere queſto autore, il quale. <lb/></s>
  <s xml:id="echoid-s1510" xml:space="preserve">_nel Lib._ </s>
  <s xml:id="echoid-s1511" xml:space="preserve">1. </s>
  <s xml:id="echoid-s1512" xml:space="preserve">camina con queſti auertimenti. </s>
  <s xml:id="echoid-s1513" xml:space="preserve">_Nel 5. </s>
  <s xml:id="echoid-s1514" xml:space="preserve">Theorema_ <lb/>auertiſce che, _Omni corpori natur ali eſt aliquod pondus ſui pro-_ <lb/>_prium &amp; </s>
  <s xml:id="echoid-s1515" xml:space="preserve">iuſtum ſine reſpectu alterius_.</s>
  <s xml:id="echoid-s1516" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1517" xml:space="preserve">Per peſo giuſto del graue intende quello, che queſto peſareb. <lb/></s>
  <s xml:id="echoid-s1518" xml:space="preserve">be nel vacuo, che però ſoggiunge _il 6. </s>
  <s xml:id="echoid-s1519" xml:space="preserve">Theorema: </s>
  <s xml:id="echoid-s1520" xml:space="preserve">Reſpectu li_ <lb/>_quidi in quo corpus libratur pondus eius non eſt proprium, nec iu-_ <lb/>_stum. </s>
  <s xml:id="echoid-s1521" xml:space="preserve">E nel Theorema 10. </s>
  <s xml:id="echoid-s1522" xml:space="preserve">Cuiuscunque corporis pondus, quocumque_ <lb/>_medio libretur propter medium illud à iuſto ſuo pondere deficit. </s>
  <s xml:id="echoid-s1523" xml:space="preserve">E nel_ <lb/>_Theorema 13. </s>
  <s xml:id="echoid-s1524" xml:space="preserve">Medium tenuius, &amp; </s>
  <s xml:id="echoid-s1525" xml:space="preserve">liquidius minus imminuit corporis_ <lb/>_pondus iuſtuns, &amp; </s>
  <s xml:id="echoid-s1526" xml:space="preserve">proprium, &amp; </s>
  <s xml:id="echoid-s1527" xml:space="preserve">medium denſius, &amp; </s>
  <s xml:id="echoid-s1528" xml:space="preserve">compactius_ <lb/>_magis imminuit_.</s>
  <s xml:id="echoid-s1529" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1530" xml:space="preserve">Mà queſta mancanza di peſo proptio nel graue non ſolo di-<lb/>pende dal mezzo, che lo diminuiſce, come ha detto, ma anco <lb/>dalla figura. </s>
  <s xml:id="echoid-s1531" xml:space="preserve">Che perciò hauendo detto _nel 7. </s>
  <s xml:id="echoid-s1532" xml:space="preserve">Theorema_, che <lb/>_Reſpectu figuræ, qua corporis cuiuſcunq; </s>
  <s xml:id="echoid-s1533" xml:space="preserve">moles circunſcribitur pon-_ <lb/>_dus eius eſt aut iustum, aut iniuſtum_, ſoggiunge nell’s. </s>
  <s xml:id="echoid-s1534" xml:space="preserve">_Iustum pon-_ <lb/>_dus nullis corpori eſſe poteſt extra figuram exactè sfericam_. </s>
  <s xml:id="echoid-s1535" xml:space="preserve">E chia-<lb/>riſſimamente _nel 13. </s>
  <s xml:id="echoid-s1536" xml:space="preserve">Omne corpus in figuram sfericam conforma-_ <lb/>_tum, eſt ſeipſo in quamcunque aliam figuram conformato ponde-_ <lb/>_roſius. </s>
  <s xml:id="echoid-s1537" xml:space="preserve">E nel 17. </s>
  <s xml:id="echoid-s1538" xml:space="preserve">Corpus quod eſt figura latiore, &amp; </s>
  <s xml:id="echoid-s1539" xml:space="preserve">ſecundum partem_ <lb/>_laxiorem applicatum, plus à grauitate medij ſuppoſiti, vel obiecti_ <lb/>_ſuſtinetur, quam ſi ſit figura contractiore, &amp; </s>
  <s xml:id="echoid-s1540" xml:space="preserve">ſecundum partem ar-_ <lb/>_ctiorem applicetur_.</s>
  <s xml:id="echoid-s1541" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1542" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s1543" xml:space="preserve">Da tutti queſti ſuoi nudi Theoremi, ne veſtiti con al-<lb/>cuna ragione, non mi ſento punto moſſo a ſcoſtarmi da <lb/>quanto hieri hò detto; </s>
  <s xml:id="echoid-s1544" xml:space="preserve">mentre certo tutte le ragioni, &amp; </s>
  <s xml:id="echoid-s1545" xml:space="preserve">eſ-<lb/>perienze ſono in contrario; </s>
  <s xml:id="echoid-s1546" xml:space="preserve">ne quanto al peſo del corpo ha <lb/>punto che fare la figura. </s>
  <s xml:id="echoid-s1547" xml:space="preserve">Onde ſe la sfera ſolida d’oro peſa-<lb/>rà in aria Libre 100. </s>
  <s xml:id="echoid-s1548" xml:space="preserve">e in acqua 95. </s>
  <s xml:id="echoid-s1549" xml:space="preserve">ridotto queſto in qual ſi <lb/>ſia figura (pure che le parti ſue non ſi conſtipaſſero, o rarefa-<lb/>ceſſero, &amp; </s>
  <s xml:id="echoid-s1550" xml:space="preserve">in conſeguenza non ſe reduceſſero a maggior, ò <lb/>minor mole) ſempre ſi ritrouarà il medemo peſo. </s>
  <s xml:id="echoid-s1551" xml:space="preserve">E ſe ſi ri-<lb/>trouarà varietà, come quando ſi poneua nell’acqua il vaſo <lb/>d’oro pieno d’aria, che peſaua Libre 93. </s>
  <s xml:id="echoid-s1552" xml:space="preserve">la varietà nõ naſcerà <lb/>dall’oro ridotto in figura più grande, ma dall’aria, mentre
<pb o="44" file="00050" n="50" rhead="DIALOGO"/>
che il locato entro l’acqua è vn compoſto d’oro, e d’aria; </s>
  <s xml:id="echoid-s1553" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s1554" xml:space="preserve"><lb/>in conſeguenza maggiore del puro oro, il quale in tutte le <lb/>forme è ſempre il medemo ſolido à puntino.</s>
  <s xml:id="echoid-s1555" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1556" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s1557" xml:space="preserve">Come è il medemo ſolido à puntino? </s>
  <s xml:id="echoid-s1558" xml:space="preserve">Non prouano co. <lb/></s>
  <s xml:id="echoid-s1559" xml:space="preserve">munemente li Geometri, che la figura sferica è la più capa-<lb/>ce di tutte l’iſo perimetre, ò eguali? </s>
  <s xml:id="echoid-s1560" xml:space="preserve">Onde mentre che ridot-<lb/>to queſto oro in qual ſi ſia altra figura, queſta deue circon-<lb/>ſcriuere il medemo oro; </s>
  <s xml:id="echoid-s1561" xml:space="preserve">biſogna che queſta ſia maggio-<lb/>re.</s>
  <s xml:id="echoid-s1562" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1563" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s1564" xml:space="preserve">Certo che lo dicono. </s>
  <s xml:id="echoid-s1565" xml:space="preserve">E così queſt’ oro ridotto in sfera <lb/>è circonſcritto dalla minima delle figure, la quale certo ſem-<lb/>pre è fatta maggiore, ogni qual volta diuerſificata dalla sfe-<lb/>rica, debba terminare la medema materia. </s>
  <s xml:id="echoid-s1566" xml:space="preserve">Ma non eſſendo <lb/>la ſu perficie, ma il ſolido quello, che peſa; </s>
  <s xml:id="echoid-s1567" xml:space="preserve">mentre queſto è <lb/>ſempre il medemo, benche hora ambito da maggiore, ho-<lb/>ra da minor ſuperficie, peſarà anco ſempre, ambito da <lb/>qual ſi ſia ſuperficie, il medemo peſo in tutti li mezzi.</s>
  <s xml:id="echoid-s1568" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1569" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s1570" xml:space="preserve">Ma chi non vede che le 100. </s>
  <s xml:id="echoid-s1571" xml:space="preserve">Libre d’oro ridotte in figu-<lb/>ra sferica, ò cubica deſcenderanno per l’acqua per molto <lb/>ſpacio in tempo molto breue, nel quale ridotte in priſma, ò <lb/>parallelepipedo molto largo, con queſta parte larga collo-<lb/>cate entro all’acqua, non deſcenderanno che per pochiſſi-<lb/>mo ſpacio? </s>
  <s xml:id="echoid-s1572" xml:space="preserve">Ecco adunque che la figura larga, &amp; </s>
  <s xml:id="echoid-s1573" xml:space="preserve">ampla leua <lb/>molto dalla grauità delli ſolidi, cioè li rende aſſai meno va-<lb/>lidi, e pronti a penetrar il mezzo.</s>
  <s xml:id="echoid-s1574" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1575" xml:space="preserve">_Mat._ </s>
  <s xml:id="echoid-s1576" xml:space="preserve">Io non voglio determinare aſſolutamente ſe l’ampiezza <lb/>della figura a mbiente arrechi qualche impedimento a ſupe <lb/>rar il mezzo nelli graui, che ſi muouono ni turalmente all’ <lb/>ingiù, o nò; </s>
  <s xml:id="echoid-s1577" xml:space="preserve">ma dico bene, che queſto, ſe vi è, non è quanto <lb/>forſe alcuno penſa; </s>
  <s xml:id="echoid-s1578" xml:space="preserve">e che il ſpacio paſſato da due graui egua-<lb/>li, vno di figura raccolta, l’altro di quanto ſi vuole dilatata, <lb/>non è tanto differente, quanto forſe alcuno penſa (quando <lb/>però per ſpacio s’intenda quello, che veramente biſogna in <lb/>tendere, cioè non vna ſemplice lunghezza, ma vna trina di-<lb/>menſione, o corpo.) </s>
  <s xml:id="echoid-s1579" xml:space="preserve">E per dichiararmi dico, che poſto il cu-<lb/>bo, il cui profilo A D, più graue in ſpecie dell’acqua, in <lb/>eſſa, queſto diſcende ſino al fondo, come in E H, con vna tal <lb/>velocità, che corriſponde all’ecceſſo della ſua grauità ſpeci-
<pb o="45" file="00051" n="51" rhead="SECONDO."/>
ſica ſopra quella dell’acqua; </s>
  <s xml:id="echoid-s1580" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s1581" xml:space="preserve">in queſto tempo ha paſſato <lb/>tutto lò ſpacio CH, che è il profilo d’vn corpo, &amp; </s>
  <s xml:id="echoid-s1582" xml:space="preserve">hà alzato <lb/>ſucceſſiuamente vna mole d’acqua eguale all’ AF. </s>
  <s xml:id="echoid-s1583" xml:space="preserve">Intendia-<lb/>mo hora il Parallelepipedo IM, eguale al cubo AD, del qua-<lb/>le la baſe rappreſentata per LM, ſarà tanto maggiore della <lb/>baſe del cubo, quanto l’altezza AC, di queſto ſarà maggio-<lb/>te dell’LI, altezza di quello. </s>
  <s xml:id="echoid-s1584" xml:space="preserve">Queſtinel medemo tempo ſi <lb/>
<anchor type="figure" xlink:label="fig-00051-01a" xlink:href="fig-00051-01"/>
ſarà moſso più lentamente, e ſarà arriuato in N Q. </s>
  <s xml:id="echoid-s1585" xml:space="preserve">per lo <lb/>ſpacio L Q lq@ale quanto alla lunghezza LO, ſarà aſsai mi-<lb/>nore della lunghezza C G, ma però quanto alla ſolidità <lb/>L Q, che è la vera e ſsenza del ſpacio, hauerà fatto vn ſpacio <lb/>ſe non eguale, non tanto minore dello ſpacio CH; </s>
  <s xml:id="echoid-s1586" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s1587" xml:space="preserve">hauerà <lb/>alzato vna mole d’acqua IB, ò eguale, ò poco minore della <lb/>molc AF; </s>
  <s xml:id="echoid-s1588" xml:space="preserve">perche, come dice il prouerbio, quello che non và <lb/>nel buſto, và nelle maniche; </s>
  <s xml:id="echoid-s1589" xml:space="preserve">poiche il ſuo ſpacio paſſato è <lb/>molto largo, in comparatione di quello paſſato dal cubo, ſe
<pb o="46" file="00052" n="52" rhead="DIALOGO"/>
il paſſato da queſto, è di quello più lungo.</s>
  <s xml:id="echoid-s1590" xml:space="preserve"/>
</p>
<div xml:id="echoid-div10" type="float" level="2" n="1">
  <figure xlink:label="fig-00051-01" xlink:href="fig-00051-01a">
    <image file="00051-01" xlink:href="http://echo.mpiwg-berlin.mpg.de/zogilib?fn=/permanent/library/9EXVCG1R/figures/00051-01"/>
  </figure>
</div>
<p>
  <s xml:id="echoid-s1591" xml:space="preserve">_Conte._ </s>
  <s xml:id="echoid-s1592" xml:space="preserve">Queſta dottrina non mi diſpiace; </s>
  <s xml:id="echoid-s1593" xml:space="preserve">e parmi che aſſai ragio-<lb/>neuolmente ſe facia ponderatione ſopra la differenza dello <lb/>ſpatio paſſato dal graue più raccolto, e più dilatato; </s>
  <s xml:id="echoid-s1594" xml:space="preserve">cioè che <lb/>quello ſia ben più lungo di queſto, ma non forſe maggiore; <lb/></s>
  <s xml:id="echoid-s1595" xml:space="preserve">e ſe maggiore, non tanto quanto altri penſa. </s>
  <s xml:id="echoid-s1596" xml:space="preserve">E da quanto <lb/>V. </s>
  <s xml:id="echoid-s1597" xml:space="preserve">S. </s>
  <s xml:id="echoid-s1598" xml:space="preserve">ha detto, parmi che ſe poſſa aſſegnare, ſe non la totale, <lb/>almeno vna delle vere cagioni, perla quale il medemo cor-<lb/>po ridotto in figura più ampla, debba deſcender più lenta-<lb/>mente, che in figura raccolta. </s>
  <s xml:id="echoid-s1599" xml:space="preserve">In gratia me dica Sig. </s>
  <s xml:id="echoid-s1600" xml:space="preserve">Ofredi. </s>
  <s xml:id="echoid-s1601" xml:space="preserve"><lb/>Se V.</s>
  <s xml:id="echoid-s1602" xml:space="preserve">S. </s>
  <s xml:id="echoid-s1603" xml:space="preserve">cõ vna determinata forza alzaſſe in vn determinato <lb/>tempo vn graue ad eſsa adequato, potrebbe con la medema <lb/>forza nel medemo tempo, alzarne vn maggiore?</s>
  <s xml:id="echoid-s1604" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1605" xml:space="preserve">_Ofred._ </s>
  <s xml:id="echoid-s1606" xml:space="preserve">Supponga pure che io riſponda di nò.</s>
  <s xml:id="echoid-s1607" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1608" xml:space="preserve">_Conte._ </s>
  <s xml:id="echoid-s1609" xml:space="preserve">E queſta è almeno vna delle cauſe perche il medemo gra. <lb/></s>
  <s xml:id="echoid-s1610" xml:space="preserve">ue ridotto in figura ampla, diſcende più lentamente, che <lb/>quando era in figura raccolta. </s>
  <s xml:id="echoid-s1611" xml:space="preserve">La ſua grauità è ſempre la <lb/>medema e queſta, è quella, che cagiona, che deſcendendo <lb/>alzi il mezzo, per il quale diſcende, e lo cacci dal proprio luo-<lb/>go. </s>
  <s xml:id="echoid-s1612" xml:space="preserve">Onde operando ſempre con la medema forza, non può <lb/>nel medemo tempo alzare, che la medema quãtità del mez-<lb/>zo. </s>
  <s xml:id="echoid-s1613" xml:space="preserve">Ma quando ſi moueſſe con la medema velocità, con la <lb/>quale ſi muoue ridotto in figura raccolta, alzarebbe vna par. </s>
  <s xml:id="echoid-s1614" xml:space="preserve"><lb/>te del mezzo molto maggiore, come ſarebbe per eſempio <lb/>l’acqua IP, ſe la ſua altezza IN, foſse eguale all’ altezza A E. </s>
  <s xml:id="echoid-s1615" xml:space="preserve"><lb/>Adunque biſogna di neceſſità, che deſcenda tanto più lenta-<lb/>mente, quanto più è ridotto in figura ampla.</s>
  <s xml:id="echoid-s1616" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1617" xml:space="preserve">_Mat._ </s>
  <s xml:id="echoid-s1618" xml:space="preserve">Sia quello che eſser ſi voglia di queſta dottrina, io torno <lb/>a replicare quanto hò detto hieri; </s>
  <s xml:id="echoid-s1619" xml:space="preserve">cioè che il medemo gra-<lb/>ue collocato entro all’acqua, ò aria, ambito da qual ſi ſia fi-<lb/>gura, ſempre ſe ritrouarà del medemo peſo.</s>
  <s xml:id="echoid-s1620" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1621" xml:space="preserve">_Ofre._ </s>
  <s xml:id="echoid-s1622" xml:space="preserve">Se così è, tutte le concluſioni, che il Sig. </s>
  <s xml:id="echoid-s1623" xml:space="preserve">V an Berlicom de-<lb/>duce da queſti principij, ſaranno poco bene dedotte.</s>
  <s xml:id="echoid-s1624" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1625" xml:space="preserve">_Matem._ </s>
  <s xml:id="echoid-s1626" xml:space="preserve">Così l’eſperienza, e la ragione m’inſegna. </s>
  <s xml:id="echoid-s1627" xml:space="preserve">Ne io dubito <lb/>punto di ciò.</s>
  <s xml:id="echoid-s1628" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1629" xml:space="preserve">_Ofred._ </s>
  <s xml:id="echoid-s1630" xml:space="preserve">Ne meno io ne dubito più. </s>
  <s xml:id="echoid-s1631" xml:space="preserve">Si che parmi bene, per hora, <lb/>chiuder il Libro del Sig. </s>
  <s xml:id="echoid-s1632" xml:space="preserve">Van Berlicom; </s>
  <s xml:id="echoid-s1633" xml:space="preserve">contentandomi d’-<lb/>hauer imparato delli graui quanto ſia bene fuggir la fatica.</s>
  <s xml:id="echoid-s1634" xml:space="preserve"/>
</p>
<pb o="47" file="00053" n="53" rhead="SECONDO."/>
<p>
  <s xml:id="echoid-s1635" xml:space="preserve">_Conte._ </s>
  <s xml:id="echoid-s1636" xml:space="preserve">Io che ſono poltrone per natura, pagarei non poco, im-<lb/>parare queſta dottrina, &amp; </s>
  <s xml:id="echoid-s1637" xml:space="preserve">hauer occaſione de ſcuſarmi con <lb/>I’eſempio di queſti.</s>
  <s xml:id="echoid-s1638" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1639" xml:space="preserve">_Ofred._ </s>
  <s xml:id="echoid-s1640" xml:space="preserve">Io gle l’inſegnarò ſenza premio Hò oſſeruato, che quan-<lb/>do ſe colloca nell’acqua, o altro fluido vn corpo più largo, <lb/>che poſto, con la ſua larghezza, per il più egli non ſeguita a <lb/>muouerſi parallelo a ſe ſteſso ſino al fine, cioè con la parte <lb/>larga auanti, ma ſe riuolta con la parte più ſottile. </s>
  <s xml:id="echoid-s1641" xml:space="preserve">V. </s>
  <s xml:id="echoid-s1642" xml:space="preserve">G. <lb/></s>
  <s xml:id="echoid-s1643" xml:space="preserve">vna tauola poſta nell’acqua con la ſua parte larga, non ſegui-<lb/>ta a muouerſi così, ma ſe riuolta in taglio, e coſi ſegue a mo-<lb/>uerſi ſino al fine. </s>
  <s xml:id="echoid-s1644" xml:space="preserve">Hora dalle precedente dottrine io raccol-<lb/>go, che queſto ſia per fuggir la fatica d’alzare vna maggior <lb/>mole, che de neceſſità biſognarebbe, che alzaſse, ſeguitan-<lb/>do a muouerſi ſino al fine con la parte larga, alzandone mo-<lb/>le molto minore mouendoſi in taglio.</s>
  <s xml:id="echoid-s1645" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1646" xml:space="preserve">_Matem._ </s>
  <s xml:id="echoid-s1647" xml:space="preserve">Quando queſto folse, vi ſarebbe l’aſſioma Filoſofico, <lb/>che _Fruſtra fit per plura, quod poteſt fieri per pauciora_; </s>
  <s xml:id="echoid-s1648" xml:space="preserve">e ſi potreb-<lb/>be dire, che appetẽdo il graue accoſtarſi al centro, ſcieglieſ-<lb/>ſe la via d’arriuarui nel tempo più breue. </s>
  <s xml:id="echoid-s1649" xml:space="preserve">Ma io penſo, che <lb/>ciò non habbia punto che fare in ſimil accidente, quando <lb/>intrauenga, e che d’eſso ne ſia altra ragione proueniente pe-<lb/>rò dal mezzo, che s’alza; </s>
  <s xml:id="echoid-s1650" xml:space="preserve">e che non meno ſe poſſi tramutare <lb/>la diſceſa del graue dalla parte più larga, nella più ſottile, <lb/>ma anco da queſta in quella.</s>
  <s xml:id="echoid-s1651" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1652" xml:space="preserve">_Ofred._ </s>
  <s xml:id="echoid-s1653" xml:space="preserve">Sentirò volontieri il ſuo penſiero.</s>
  <s xml:id="echoid-s1654" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1655" xml:space="preserve">_Matem._ </s>
  <s xml:id="echoid-s1656" xml:space="preserve">Tengo di certo che V. </s>
  <s xml:id="echoid-s1657" xml:space="preserve">S. </s>
  <s xml:id="echoid-s1658" xml:space="preserve">ſapia, che ogni corpo ha il ſuo <lb/>centro di grauità, mediante il quale ſe regola la diſceſa di <lb/>eſſo corpo, di modo che chi imaginaſse vna linea retta, che <lb/>congiongeſse queſto centro con quello della terra, il det-<lb/>to centro nel diſcendere ſempre ſi trouarebbe in detta li-<lb/>nea.</s>
  <s xml:id="echoid-s1659" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1660" xml:space="preserve">Credo anco che ſa pia, che queſto centro ſia in tal modo col-<lb/>locato nel graue, che diuiſo queſto con vn piano, che paſſi <lb/>per detto centro, lo diuida in due parti, che hauerebbero <lb/>momenti eguali. </s>
  <s xml:id="echoid-s1661" xml:space="preserve">Queſte però ſono anco eguali in mole, <lb/>quando il centro di grauità è il medemo che il centro della <lb/>figura, ma quando queſti centri ſono diuerſi, all’hora ſono <lb/>ineguali.</s>
  <s xml:id="echoid-s1662" xml:space="preserve"/>
</p>
<pb o="48" file="00054" n="54" rhead="DIALOGO"/>
<p>
  <s xml:id="echoid-s1663" xml:space="preserve">_Ofred._ </s>
  <s xml:id="echoid-s1664" xml:space="preserve">In gratia eſemplifi chi queſta dottrina.</s>
  <s xml:id="echoid-s1665" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1666" xml:space="preserve">_Matem._ </s>
  <s xml:id="echoid-s1667" xml:space="preserve">L’eſemplificarò in vna pezza di formaggio Piacenti-<lb/>no,</s>
</p>
<p>
  <s xml:id="echoid-s1668" xml:space="preserve">_Ofred._ </s>
  <s xml:id="echoid-s1669" xml:space="preserve">Eſempio non ſpiaceuole,</s>
</p>
<p>
  <s xml:id="echoid-s1670" xml:space="preserve">_Matem._ </s>
  <s xml:id="echoid-s1671" xml:space="preserve">La quale è terminata da due piani paralleli, che ſono <lb/>due circoli, quali ſupponga che ſiano perſetti. </s>
  <s xml:id="echoid-s1672" xml:space="preserve">Chi s’imagi-<lb/>narà vna linea, che congiunga li centri di queſti piani, il ſuo <lb/>punto di mezzo ſarà il cẽtro della figura del corpo; </s>
  <s xml:id="echoid-s1673" xml:space="preserve">e queſto <lb/>farà anco il centro di grauità, ogni qual volta il corpo del <lb/>formaggio ſia eguale da per tutto, &amp; </s>
  <s xml:id="echoid-s1674" xml:space="preserve">vniforme. </s>
  <s xml:id="echoid-s1675" xml:space="preserve">Ma ſe foſ-<lb/>ſe, ò ineguale, ò diforme; </s>
  <s xml:id="echoid-s1676" xml:space="preserve">cioè v. </s>
  <s xml:id="echoid-s1677" xml:space="preserve">g. </s>
  <s xml:id="echoid-s1678" xml:space="preserve">in vna parte più denſo, <lb/>che nell’altra, all’hora non ſarebbe il centro della grauità; <lb/></s>
  <s xml:id="echoid-s1679" xml:space="preserve">perche chi lo conſideraſſe diuiſo con vn piano perpendico-<lb/>lare alli due circoli oppoſti, che paſſaſſe per li loro centri, c <lb/>per quello dellafigura, lo diuiderebbe bene in due parti egua-<lb/>li, ma non di momenti eguali, ma ineguali; </s>
  <s xml:id="echoid-s1680" xml:space="preserve">perche hauereb-<lb/>be maggior momento Ia parte più denſa. </s>
  <s xml:id="echoid-s1681" xml:space="preserve">Il centro adunque <lb/>di grauità ſarebbe collocato in tal ſito, che diuiſo queſto <lb/>corpo con il piano perpendicolare alle baſi oppoſte, che paſ-<lb/>ſaſse per eſſo, lo diuideſse in due parti ineguali di mole, &amp; </s>
  <s xml:id="echoid-s1682" xml:space="preserve"><lb/>eguali in momento.</s>
  <s xml:id="echoid-s1683" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1684" xml:space="preserve">_Ofred._ </s>
  <s xml:id="echoid-s1685" xml:space="preserve">Ho inteſo à ſufficienza.</s>
  <s xml:id="echoid-s1686" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1687" xml:space="preserve">_Matem._ </s>
  <s xml:id="echoid-s1688" xml:space="preserve">Supponiamo queſto formaggio collocato nell’acqua <lb/>con vno delli ſuoi circoli orizontalmente, e ſupponiamo <lb/>che l’acqua ſia corpo homogeneiſſimo, e reſiſtente egual-<lb/>mente, ſecondo tutte le ſue parti. </s>
  <s xml:id="echoid-s1689" xml:space="preserve">Già V. </s>
  <s xml:id="echoid-s1690" xml:space="preserve">S. </s>
  <s xml:id="echoid-s1691" xml:space="preserve">sà, che deſcen-<lb/>dendo il formaggio preme ſopra l’acqua, e la fà ſalire, al <lb/>qual ſalimento contraſta queſta con la ſua grauità. </s>
  <s xml:id="echoid-s1692" xml:space="preserve">E perche <lb/>la ſupponiamo corpo homogeneo, à parti di formaggio di <lb/>mole eguali, corriſpondono eguali contraſtamenti di moli <lb/>d’acqua pur eguali.</s>
  <s xml:id="echoid-s1693" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1694" xml:space="preserve">_Ofred._ </s>
  <s xml:id="echoid-s1695" xml:space="preserve">Così certo biſogna che ſia.</s>
  <s xml:id="echoid-s1696" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1697" xml:space="preserve">_Matem._ </s>
  <s xml:id="echoid-s1698" xml:space="preserve">Hora ſupponiamo che il formaggio ſia anch’ eſso cor-<lb/>po homogeneo, ſiche il centro della figura ſia il medemo <lb/>con quello della grauità; </s>
  <s xml:id="echoid-s1699" xml:space="preserve">all’hora ſe mantenirà parallelo a <lb/>ſe ſteſso ſino al fine della diſceſa; </s>
  <s xml:id="echoid-s1700" xml:space="preserve">perche regolando la diſce-<lb/>ſa il centro della grauità, &amp; </s>
  <s xml:id="echoid-s1701" xml:space="preserve">in tal caſo, della figura inſieme; <lb/></s>
  <s xml:id="echoid-s1702" xml:space="preserve">con parti eguali di mole, e di momenti eguali di eſso, con-
<pb o="49" file="00055" n="55" rhead="SECONDO."/>
traſtano parti pure eguali dell’acqua: </s>
  <s xml:id="echoid-s1703" xml:space="preserve">Onde eſſendo tutte <lb/>le coſe eguali, non vi è cagione di variatione. </s>
  <s xml:id="echoid-s1704" xml:space="preserve">Ma ſe diuerſo <lb/>è il centro di grauità da quello della figura, di modo che le <lb/>ſue parti ſiino bene di momenti eguali, ma ineguali in gran-<lb/>dezza, all’hora premendo parti eguali di momento, &amp; </s>
  <s xml:id="echoid-s1705" xml:space="preserve">ine-<lb/>guali di mole, parti ineguali del mezzo, cioè la maggiore, <lb/>maggiore, e la minore, minore; </s>
  <s xml:id="echoid-s1706" xml:space="preserve">incontrano anco ineguali <lb/>reſiſtenze, perche più reſiſte ad eſser alzata la parte maggio-<lb/>re, che la minore, mentre ſono premute con forze eguali; </s>
  <s xml:id="echoid-s1707" xml:space="preserve">e <lb/>così ſono non vinte egualmente le loro reſiſtenze, ma prima <lb/>la minore, che la maggiore. </s>
  <s xml:id="echoid-s1708" xml:space="preserve">E da quì ne naſce il deturba men-<lb/>to del ſito parallelo, ò orizontale; </s>
  <s xml:id="echoid-s1709" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s1710" xml:space="preserve">il riuoltarſi del formag-<lb/>gio in taglio.</s>
  <s xml:id="echoid-s1711" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1712" xml:space="preserve">_Ofred._ </s>
  <s xml:id="echoid-s1713" xml:space="preserve">Se io hò capito bene, non ſolo queſta variatione potreb-<lb/>be naſcere quando il formaggio foſse diforme, &amp; </s>
  <s xml:id="echoid-s1714" xml:space="preserve">il mezzo <lb/>vniforme, ma anco quando il formaggio foſſe vniforme, e <lb/>il mezzo diforme.</s>
  <s xml:id="echoid-s1715" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1716" xml:space="preserve">_Matem._ </s>
  <s xml:id="echoid-s1717" xml:space="preserve">Certiſſimo che così è; </s>
  <s xml:id="echoid-s1718" xml:space="preserve">e V. </s>
  <s xml:id="echoid-s1719" xml:space="preserve">S. </s>
  <s xml:id="echoid-s1720" xml:space="preserve">intende molto bene Et <lb/>inteſo queſto non hauerà difficoltà d’intendere, che ſe ridot-<lb/>to il formaggio in taglio, e diuiſo pure in due parti da vn <lb/>piano parallelo alla baſi, che lò diuida pure per il centro di <lb/>grauità, che parimente può eſsere, che queſte parti non ſii-<lb/>no eguali di mole, benche di momento, e che perciò, per la <lb/>medema ragione, ſia turbato da quel ſito, e di nuouo ridot-<lb/>to al ſito parallelo, ò orizontale. </s>
  <s xml:id="echoid-s1721" xml:space="preserve">Benche però queſto ſia <lb/>per ſuccedere più difficilmente, &amp; </s>
  <s xml:id="echoid-s1722" xml:space="preserve">in diſceſa più lunga, men-<lb/>tre minore è l’acqua, che viene alzata, nè n’alza vna mole <lb/>ad eſſo eguale, ſe non quando è diſceſo per il diametro della <lb/>baſe, cioè per tutta la ſua lunghazza, ò larghezza; </s>
  <s xml:id="echoid-s1723" xml:space="preserve">hauendo <lb/>alzato vna mole eguale, quando diſcende con la parte larga, <lb/>e orizontalmente, quando è ſolamente diſceſo per tutta la <lb/>ſua altezza, ò groſſezza, che nella forma dell’ordina@io for-<lb/>maggio piacentino è molto minore di quella.</s>
  <s xml:id="echoid-s1724" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1725" xml:space="preserve">_Ofred._ </s>
  <s xml:id="echoid-s1726" xml:space="preserve">Hò io inteſo tanto, che parmi anco di poter dimoſtrare <lb/>douer ſucceder queſtoeffetto anco quando il ſolido. </s>
  <s xml:id="echoid-s1727" xml:space="preserve">che di-<lb/>ſcende foſſe vniformiſſimo, per ſola cagione della figura. <lb/></s>
  <s xml:id="echoid-s1728" xml:space="preserve">E benche poteſſi io dimoſtrar ciò in infiniti ſolidi, ſcieglierò <lb/>il Priſma retto, del quale le baſi oppoſte ſiino li triangoli
<pb o="50" file="00056" n="56" rhead="DIALOGO"/>
DFE, ABC. </s>
  <s xml:id="echoid-s1729" xml:space="preserve">Dico adunque, che collocato nell’ acqua per-<lb/>pendicolarmente, cioè la baſe ABC, orizontale, queſto non <lb/>ſeguirà a muouerſi così, ma de neceſſità ſi voltarà nel taglio <lb/>DA. </s>
  <s xml:id="echoid-s1730" xml:space="preserve">Perche ſe intenderemo’la LM, che congiunga li centri <lb/>di grauità delli due triangoli oppoſti, nel mezzo di eſſa ſarà <lb/>il centro di grauità del Priſma. </s>
  <s xml:id="echoid-s1731" xml:space="preserve">Il quale ſe s’intenderà diuiſo <lb/>con il piano HI, parallelo all’ EB, lo diuiderà in due par-<lb/>ti di momenti eguali, ma non eguali di mole; </s>
  <s xml:id="echoid-s1732" xml:space="preserve">perche il Priſ-<lb/>ma del quale è baſe il Trapezio BIKC, al priſma del quale è <lb/>baſe il triangolo A K I, ha la medema proportione, che hà <lb/>
<anchor type="figure" xlink:label="fig-00056-01a" xlink:href="fig-00056-01"/>
il trapezio al triangolo. </s>
  <s xml:id="echoid-s1733" xml:space="preserve">Ma quello a queſto ha la proportio-<lb/>ne, che ha 5. </s>
  <s xml:id="echoid-s1734" xml:space="preserve">à 4. </s>
  <s xml:id="echoid-s1735" xml:space="preserve">perche M, centro de grauità del triangolo <lb/>ABC, diuide l’aſſe PA, di modo, che PA, ſia ſeſquialtera di <lb/>AM; </s>
  <s xml:id="echoid-s1736" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s1737" xml:space="preserve">il trapezio al triangolo hà la proportione, che ha <lb/>l’ecceſſo del quadrato P A, ſopra il quadrato AM, al mede-<lb/>mo; </s>
  <s xml:id="echoid-s1738" xml:space="preserve">che è poi quella, che ha 5. </s>
  <s xml:id="echoid-s1739" xml:space="preserve">a 4.</s>
  <s xml:id="echoid-s1740" xml:space="preserve"/>
</p>
<div xml:id="echoid-div11" type="float" level="2" n="2">
  <figure xlink:label="fig-00056-01" xlink:href="fig-00056-01a">
    <image file="00056-01" xlink:href="http://echo.mpiwg-berlin.mpg.de/zogilib?fn=/permanent/library/9EXVCG1R/figures/00056-01"/>
  </figure>
</div>
<pb o="51" file="00057" n="57" rhead="SECONDO."/>
<p>
  <s xml:id="echoid-s1741" xml:space="preserve">_Conte_. </s>
  <s xml:id="echoid-s1742" xml:space="preserve">Cancaro Signor Ofredi, V. </s>
  <s xml:id="echoid-s1743" xml:space="preserve">S. </s>
  <s xml:id="echoid-s1744" xml:space="preserve">è vn Geometra del trenta <lb/>para.</s>
  <s xml:id="echoid-s1745" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1746" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s1747" xml:space="preserve">Mò che crede V. </s>
  <s xml:id="echoid-s1748" xml:space="preserve">S?</s>
  <s xml:id="echoid-s1749" xml:space="preserve">Se me ce metto, le dirò altre coſe, che <lb/>queſte. </s>
  <s xml:id="echoid-s1750" xml:space="preserve">Poiche non ſolo è vero quanto s’è detto del Priſma <lb/>ſopra il triangolo, ma anco ſopra qual ſi ſia dell’ inſinite Pa-<lb/>rabole; </s>
  <s xml:id="echoid-s1751" xml:space="preserve">Trilinei; </s>
  <s xml:id="echoid-s1752" xml:space="preserve">e per dirla in poche parole, ſopra qual ſi ſia <lb/>di quelle figure, che noi altri Geometri chiamiamo _in alte-_ <lb/>_ram partem deficientes_. </s>
  <s xml:id="echoid-s1753" xml:space="preserve">Poiche tutti queſti Priſmi collocati <lb/>perpendicolari nell’acqua con vna delle ſue baſi, ſe riuolta-<lb/>ranno, a lungo andare, in taglio.</s>
  <s xml:id="echoid-s1754" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1755" xml:space="preserve">_Conte_. </s>
  <s xml:id="echoid-s1756" xml:space="preserve">Non più, non più Sig Ofredi, che ſe và troppo dietro, <lb/>mi fara vſcir di me, per il ſtupore cagionatomi dalla ſua grã <lb/>peritia. </s>
  <s xml:id="echoid-s1757" xml:space="preserve">Io andauo ruminando vn’altra coſa, che non sò s’ha-<lb/>uerà che fare con le ſue ſottigliezze.</s>
  <s xml:id="echoid-s1758" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1759" xml:space="preserve">Se non ſi è ſtabilito di ſopra aſſolutamente, che ſolidi eguali, <lb/>nel medemo tempo alzino moli del mezzo eguali, poco me. <lb/></s>
  <s xml:id="echoid-s1760" xml:space="preserve">no; </s>
  <s xml:id="echoid-s1761" xml:space="preserve">poiche ſi è quaſi ſtabilito, che l’acque v. </s>
  <s xml:id="echoid-s1762" xml:space="preserve">g. </s>
  <s xml:id="echoid-s1763" xml:space="preserve">alzate nel <lb/>medemo tempo dal cubo, e dal parallelepido largo ad eſſo <lb/>eguale, ſiano, ſe non eguali, poco meno; </s>
  <s xml:id="echoid-s1764" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s1765" xml:space="preserve">in conſeguenza <lb/>ſi è quaſi ſtabilito, che l’ampiezza della figura non cagioni il <lb/>tranſito di minor ſpacio, inteſo per ſpacio il ſolido, e non la <lb/>ſua lunghezza. </s>
  <s xml:id="echoid-s1766" xml:space="preserve">Hora io andauo penſando, che ſe poſſi di-<lb/>moſtrare in pratica, che l’ampiezza della figura cagioni mol-<lb/>to minor alzamento del mezzo; </s>
  <s xml:id="echoid-s1767" xml:space="preserve">poiche il medeſimo ſolido <lb/>moſso per vn verſo, e për l’altro, in tempi molto differen-<lb/>ti alzerà moli eguali del mezzo.</s>
  <s xml:id="echoid-s1768" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1769" xml:space="preserve">Prendaſi vn Cono, ò qual ſi ſia Piramide, e ſe poſi nell’ acqua <lb/>con la baíe all’ingiù, poi con la punta; </s>
  <s xml:id="echoid-s1770" xml:space="preserve">in tutti doi li modi <lb/>quando farà diſceſo per tutta la ſua lunghezza, hauerà alza-<lb/>to vna mole d’acqua ad eſſo eguale. </s>
  <s xml:id="echoid-s1771" xml:space="preserve">Hora chi non vede, che <lb/>diſcenderà la ſua altezza in tempo aſſai minore mouendoſi <lb/>con la punta all’ingiù, che con la baſe? </s>
  <s xml:id="echoid-s1772" xml:space="preserve">Adunque la larghez-<lb/>za della baſe è cagione d’alzamento di minor mole del mez <lb/>zo in tempo eguale.</s>
  <s xml:id="echoid-s1773" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1774" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s1775" xml:space="preserve">V. </s>
  <s xml:id="echoid-s1776" xml:space="preserve">S. </s>
  <s xml:id="echoid-s1777" xml:space="preserve">ſe bene parla con il quaſi nulladimeno troppo s’ac-<lb/>coſta al preciſo. </s>
  <s xml:id="echoid-s1778" xml:space="preserve">Auerta adunque bene, che in niun modo <lb/>s è ſtabilito, che il mede no ſolido ridotto in mole piu larga, <lb/>alzi nel medemo tempo, tanta mole del mezzo, quanto
<pb o="52" file="00058" n="58" rhead="DIALOGO"/>
nella più riſtretta; </s>
  <s xml:id="echoid-s1779" xml:space="preserve">ma ſolo ſi è detto, che non è tanta la dif-<lb/>ferenza, quanto vno ſi penſa. </s>
  <s xml:id="echoid-s1780" xml:space="preserve">Non hò poi mai eſperimen-<lb/>tato ſe il medemo cono di materia, che deſcenda nell’acqua, <lb/>paſſi il medemo ſpacio più velocemente, e quanto, mouen-<lb/>doſi con la punta all’ingiù, che con la baſe. </s>
  <s xml:id="echoid-s1781" xml:space="preserve">Parmi però bene <lb/>(ſe vi è queſta differenza, che hora dirò non ſapere ſe vi ſia, <lb/>ne quanta) andar inueſtigando doue poteſſe naſcere; </s>
  <s xml:id="echoid-s1782" xml:space="preserve">il che <lb/>ne ſuccederà, ſe conſideraremo quanto occora nell’ vna, e <lb/>nell’altra maniera.</s>
  <s xml:id="echoid-s1783" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1784" xml:space="preserve">Imaginiamoſi adunque il vaſo A D, ripieno d’acqua, ò d’altro <lb/>liquido, &amp; </s>
  <s xml:id="echoid-s1785" xml:space="preserve">in eſſo il cono EFG, immerſo che ſia diſceſo ſino <lb/>in HKI. </s>
  <s xml:id="echoid-s1786" xml:space="preserve">Queſto hauerà alzato l’acqua OHKIPF, che ſarà ſa-<lb/>lita a riẽpire lò ſpacio del fruſto conico EOPG, la quale HI, <lb/>ſe ſarà viciniſſima all’EG, di modo che paſſi per il punto fi-<lb/>ſico immediato, ne diſti da eſſa, che per vn ſol punto fiſico, <lb/>all’hora l’acqua cacciata OHKIPF, ſe bene ſarà geometrica-<lb/>mente vn corpo, ſe potrà pigliare come vna ſuperficie fiſica, <lb/>eguale alla ſuperficie conica EFG; </s>
  <s xml:id="echoid-s1787" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s1788" xml:space="preserve">il fruſto conico EOPG, <lb/>che hauerà riẽpito, ſarà eguale fiſicamẽte al circolo EG, baſe <lb/>del cono. </s>
  <s xml:id="echoid-s1789" xml:space="preserve">Queſt’acqua poi viene alzata dalla preſſione, che fà <lb/>
<anchor type="figure" xlink:label="fig-00058-01a" xlink:href="fig-00058-01"/>
il cono con tutta la ſua ſuperficie EFG, ſopra l’acqua, ſi che <lb/>ogni portione min ma della ſuperſicie preme vna minima <lb/>portione dell’acqua; </s>
  <s xml:id="echoid-s1790" xml:space="preserve">e tutta queſta ſaliſse a formare vn cir-<lb/>colo eguale alla baſe. </s>
  <s xml:id="echoid-s1791" xml:space="preserve">E perche la diſceſa ſi fà ſucceſſiua-
<pb o="53" file="00059" n="59" rhead="SECONDO."/>
mente, ſe intenderemo l’aſſe del cono diuiſo in punti fiſici, <lb/>per li quali diſcenda il cono, potremo dire, che queſta alza-<lb/>ta dell’acqua ſi facia di modo, che vna continua ſalita d’ac-<lb/>qua ſucceſſiua, eguale fiſicamente alla ſuperficie, ſi riduca <lb/>in vna continua ſerie de circoli eguali alla baſe. </s>
  <s xml:id="echoid-s1792" xml:space="preserve">E perche la <lb/>ſuperficie è maggiore della baſe, come appare, demoſtrando <lb/>li Geometri che habbia la proportione alla baſe, che ha l’FE, <lb/>lato del cono (parlando nelli coni retti) alla metà dell’ EG, <lb/>diametro dalla baſe, potremo dire, che in queſta alzata, con-<lb/>tinue portioni d’acqua eguali fiſica mente alla ſuperficie co-<lb/>nica, ſe reſtringano nelli circoli eguali alla baſe. </s>
  <s xml:id="echoid-s1793" xml:space="preserve">In queſta <lb/>diſceſa adunque di cono, e ſalita d’acqua ſi fa come vna cõ-<lb/>tinua condenſatione, mentre coſa eguale alla ſuperficie co-<lb/>nica, ſe reſtringe in circolo, che è minore d’eſſa.</s>
  <s xml:id="echoid-s1794" xml:space="preserve"/>
</p>
<div xml:id="echoid-div12" type="float" level="2" n="3">
  <figure xlink:label="fig-00058-01" xlink:href="fig-00058-01a">
    <image file="00058-01" xlink:href="http://echo.mpiwg-berlin.mpg.de/zogilib?fn=/permanent/library/9EXVCG1R/figures/00058-01"/>
  </figure>
</div>
<p>
  <s xml:id="echoid-s1795" xml:space="preserve">Conſideriamo hora quello che ſucceda quando diſcende il co-<lb/>no con la baſe. </s>
  <s xml:id="echoid-s1796" xml:space="preserve">In queſto caſo, diſceſo che ſarà in HI, haue-<lb/>rà ſpinto insù l’acqua HOPI, che hauerà riempito lo ſpacio <lb/>OEFGPK. </s>
  <s xml:id="echoid-s1797" xml:space="preserve">Se adunque conſideraremo come ſopra, che HI, <lb/>diſti dall’ EG, per vn ſolo punto fiſico, potremo dire, che vna <lb/>mole d’acqua eguale alla baſe, ſia ſalita a riempire vno ſpa-<lb/>cio eguale alla ſuperſicie; </s>
  <s xml:id="echoid-s1798" xml:space="preserve">e che in tutta la diſceſa moli d’ac-<lb/>qua eguali alla baſe, ſaliſchino a riempire ſpacii eguali alla <lb/>ſuperſicie; </s>
  <s xml:id="echoid-s1799" xml:space="preserve">e che in conſeguenza ſe facia vna certa rarefat-<lb/>tione; </s>
  <s xml:id="echoid-s1800" xml:space="preserve">mentre moli eguali al minore, cioè alla baſe, ſe dila-<lb/>tano in moli maggiori, cioè in ſuperficie. </s>
  <s xml:id="echoid-s1801" xml:space="preserve">Se noti anco che la <lb/>preſſione ſi fà dal cono con la ſola baſe.</s>
  <s xml:id="echoid-s1802" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1803" xml:space="preserve">Adunque ſe conſideraremo le differenze, che interuengono in <lb/>queſti due modi, trouaremo che nel primo preme il cono <lb/>con tutta la ſuperſicie conica, che è maggiore della baſe, e <lb/>nel ſecondo preme con queſta ſola. </s>
  <s xml:id="echoid-s1804" xml:space="preserve">Parimente nel primo <lb/>ſi fà come vna certa condenſatione, e nel ſecondo come vna <lb/>rarefattione. </s>
  <s xml:id="echoid-s1805" xml:space="preserve">Se adunque vi è differenza nella diſceſa, e di-<lb/>ſcende più velocemente il cono con la punta all’ ingiù, che <lb/>con la baſe, biſogna dire che ſia più facile alla natura far al-<lb/>zar l’acqua premendola con la ſuperficie conica, e facendo-<lb/>la quaſi condenſare, che premendola con la ſola baſe, efa-<lb/>cendola come rarefare. </s>
  <s xml:id="echoid-s1806" xml:space="preserve">Quanto habbiamo detto ſeguir nel-<lb/>li coni, ſeguirà anco in tutti li conoidi, conici, &amp; </s>
  <s xml:id="echoid-s1807" xml:space="preserve">in tutti li
<pb o="54" file="00060" n="60" rhead="DIALOGO"/>
ſolidi rotondi _in alter am partem deficientibus_.</s>
  <s xml:id="echoid-s1808" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1809" xml:space="preserve">_Ofred_ Così d’improuiſo mi paſſano per la mente molticaſi, nel-<lb/>li quali parmi che più facilmente ſe facia la condenſatione, <lb/>che la rarefattione, mentre in molti di queſt la rarefattione <lb/>non ſi fa, che con certa forza eſtrinſeca, e la condenſazione <lb/>per reduttion delle parti al loro connatural ſtato primiero. <lb/></s>
  <s xml:id="echoid-s1810" xml:space="preserve">In altri però parmi all’oppoſto, ne per hora voglio penſar a <lb/>queſto. </s>
  <s xml:id="echoid-s1811" xml:space="preserve">Già però che ſtiamo trattando delle preſſioni, ſarà <lb/>bene ſeguitare la noſtra materia doue hieri laſciaſſimo, e <lb/>per la quale hoggi ſe ſiamo congregati. </s>
  <s xml:id="echoid-s1812" xml:space="preserve">Queſta appunto è <lb/>la preſſione, che fanno li liquidi ſuperiori ſopra li inferiori <lb/>ſottopoſtoli, tanto della medema ſorte, come di diuerſa.</s>
  <s xml:id="echoid-s1813" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1814" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s1815" xml:space="preserve">Che li fluidi, e la medema aria grauitino ſopra li corpi <lb/>ſottopoſtoli, è coſa tanto trita hora nelle ſcuole, e confer-<lb/>mata da tante eſperienze, ch’è vna marciſſima vergogna a <lb/>dubitarne. </s>
  <s xml:id="echoid-s1816" xml:space="preserve">Nè altro che queſta certamente cagiona l’equili-<lb/>brio dell’argento viuo nel tubo Torricelliano, ò dall’acqua, <lb/>&amp; </s>
  <s xml:id="echoid-s1817" xml:space="preserve">infiniti altri Fenomeni in natura, li quali per eſſer abbon-<lb/>dantemente ſpiegati da tanti grand’huomeni, io ſtimo bene <lb/>tralaſciarli a bella poſta.</s>
  <s xml:id="echoid-s1818" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1819" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s1820" xml:space="preserve">Io però deſidero, che me n’accenni alcuno così breue-<lb/>mente.</s>
  <s xml:id="echoid-s1821" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1822" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s1823" xml:space="preserve">Cauarò queſta narratiua dal dottiſſimo Signor Giorgio <lb/>Si<unsure/>nclaro Scozzeſe, che è quello, che hà compoſto poco fa <lb/>certi curioſiſſimi dialogi, intitola ti _Ars magna grauitatis, &amp;_</s>
  <s xml:id="echoid-s1824" xml:space="preserve"> <lb/>_leuitatis_. </s>
  <s xml:id="echoid-s1825" xml:space="preserve">Tanto più, che hauendo egli ſdegnato render ra-<lb/>gione di certo Fenomeno, ſtimandolo forſe coſa troppo lie-<lb/>ue, e perciò indegna della ſua fatica, non recuſarò io eſerci-<lb/>tarmi in queſta minutia.</s>
  <s xml:id="echoid-s1826" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1827" xml:space="preserve">Queſti adunque _nel Lib. </s>
  <s xml:id="echoid-s1828" xml:space="preserve">1. </s>
  <s xml:id="echoid-s1829" xml:space="preserve">Dial. </s>
  <s xml:id="echoid-s1830" xml:space="preserve">5. </s>
  <s xml:id="echoid-s1831" xml:space="preserve">ſett_. </s>
  <s xml:id="echoid-s1832" xml:space="preserve">7. </s>
  <s xml:id="echoid-s1833" xml:space="preserve">ſuppone che G A ſia vn <lb/>vaſo, nel fondo del quale ſia l’argento viuo F A, nel quale ſia <lb/>poſta la canna di vetro PV, aperta da tutte doi le parti, di <lb/>modo che il forame V, ſia vn poco ſolleuato dal fondo del <lb/>vaſo, poi ſuppone, che il vaſo G A, ſia riempito d’acqua. </s>
  <s xml:id="echoid-s1834" xml:space="preserve">Di-<lb/>ce che queſta premendo ſopra l’argento viuo F A, lo farà ſa. <lb/></s>
  <s xml:id="echoid-s1835" xml:space="preserve">lire per la canna P V, ſino in L, di modo che L K, ſia quaſi la <lb/>quartadecima parte di tutta l’altezza dell’acqua PK, ſi come <lb/>l’argento viuo è più graue dell’ acqua quaſi ſecondo la pro-
<pb o="55" file="00061" n="61" rhead="SECONDO"/>
portione de 14. </s>
  <s xml:id="echoid-s1836" xml:space="preserve">ad 1. </s>
  <s xml:id="echoid-s1837" xml:space="preserve">Da queſta ſenſibiliſſima eſperienza ne <lb/>caua quello, ch’è tenuto quaſi comunemente, cioè che ſe <lb/>PV, ſarà il tubo Torricelliano, ò Baroſcopio, come dice e-<lb/>gli, otturato di ſopra, nel quale l’argento viuo s’equilibri ſi-<lb/>no all’altezza L, che queſto naſca dalla preſſione, che fà vn <lb/>cilindro d’aria la di cui baſe ſia FC, &amp; </s>
  <s xml:id="echoid-s1838" xml:space="preserve">altezza quella dell’ato-<lb/>mosſera, dimodo che qual proportione ha la grauità in ſpe-<lb/>cie dell’argento viuo alla grauità in ſpecie dell’aria, tal l’hab-<lb/>bia l’altezza dell’atomosfera, all’altezza del Mercurio, <lb/>LK,</s>
</p>
  <figure>
    <image file="00061-01" xlink:href="http://echo.mpiwg-berlin.mpg.de/zogilib?fn=/permanent/library/9EXVCG1R/figures/00061-01"/>
  </figure>
<p>
  <s xml:id="echoid-s1839" xml:space="preserve">_Ofred._ </s>
  <s xml:id="echoid-s1840" xml:space="preserve">In queſte coſe non vi ſono affatto nouitio, che perciò hò <lb/>inteſo a ſufficienza. </s>
  <s xml:id="echoid-s1841" xml:space="preserve">Vorrei hora intender il reſto, cioè la <lb/>cauſa di quel Fenomeno, che ſopra fù detto hauer egli tra-<lb/>laſciata.</s>
  <s xml:id="echoid-s1842" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1843" xml:space="preserve">_Matem._ </s>
  <s xml:id="echoid-s1844" xml:space="preserve">V. </s>
  <s xml:id="echoid-s1845" xml:space="preserve">S. </s>
  <s xml:id="echoid-s1846" xml:space="preserve">habbi vn poco di patienza. </s>
  <s xml:id="echoid-s1847" xml:space="preserve">Già ſiè viſto che l’ac-<lb/>qua G C, fa ſalire l’argento viuo KL. </s>
  <s xml:id="echoid-s1848" xml:space="preserve">Hora queſt’ acqua non
<pb o="56" file="00062" n="62" rhead="DIALOGO"/>
richiede alcuna determinatione di mole per far ſalire nella ſi <lb/>ſtola PV, il Mercurio ſino all’altezza KL, ma bene richiede <lb/>determinatione d’altezza. </s>
  <s xml:id="echoid-s1849" xml:space="preserve">Onde ſe il vaſo, ò ſarà più largo, <lb/>che conteneſſe maggior, e maggior quantità d’acqua, ò più <lb/>ftretto, che ne conteneſſe minore, e tanto più ſtretto, che <lb/>eccedeſſe di poco poco la fiſtola, ſiche ne conteneſſe pochiſ-<lb/>ſima, mentre però ſia la medema altezza PK, ſempre farà <lb/>ſalire l’argento viuo alla medema altezza KL.</s>
  <s xml:id="echoid-s1850" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1851" xml:space="preserve">_Ofred._ </s>
  <s xml:id="echoid-s1852" xml:space="preserve">Corpo di me, che queſta coſa mi pare incredibile.</s>
  <s xml:id="echoid-s1853" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1854" xml:space="preserve">_Matem._ </s>
  <s xml:id="echoid-s1855" xml:space="preserve">E pure Sig Ofredi il negotio è certiſſimo, ne rimetto <lb/>V. </s>
  <s xml:id="echoid-s1856" xml:space="preserve">S. </s>
  <s xml:id="echoid-s1857" xml:space="preserve">ad altro, che all’eſperienza. </s>
  <s xml:id="echoid-s1858" xml:space="preserve">Hora diſcorrendo in con-<lb/>formità di quanto s’è detto, ſarà anco verò nel Baroſcopio <lb/>PV, ch’eſſendo queſto, ò più groſſo, ò più ſottile, &amp; </s>
  <s xml:id="echoid-s1859" xml:space="preserve">il cilin-<lb/>dro d’aria dell’altezza dell’atomosſera di qual ſi ſia groſsez-<lb/>za F C, anco piccioliſſima, nulladimeno ſempre alzarà l’ar-<lb/>gento viuo alla medema altezza KL. </s>
  <s xml:id="echoid-s1860" xml:space="preserve">Chi richiede la cagio-<lb/>ne di queſto Fenomeno al Sig. </s>
  <s xml:id="echoid-s1861" xml:space="preserve">Sinclaro, riſponde diſpoſtica-<lb/>mente con la ſua _Prop. </s>
  <s xml:id="echoid-s1862" xml:space="preserve">4. </s>
  <s xml:id="echoid-s1863" xml:space="preserve">dial. </s>
  <s xml:id="echoid-s1864" xml:space="preserve">1. </s>
  <s xml:id="echoid-s1865" xml:space="preserve">Lib. </s>
  <s xml:id="echoid-s1866" xml:space="preserve">1. </s>
  <s xml:id="echoid-s1867" xml:space="preserve">Corpora fluida in Libra na-_ <lb/>_turali ſibi mutuò æquiponderant ſecundum altitudinem ſolum._ </s>
  <s xml:id="echoid-s1868" xml:space="preserve">La <lb/>qual propoſitione cosi nuda ſempre porta, quando ha biſo-<lb/>gno di confermare coſe ſimili.</s>
  <s xml:id="echoid-s1869" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1870" xml:space="preserve">_Ofred._ </s>
  <s xml:id="echoid-s1871" xml:space="preserve">Forſe li deuono mancare le ragioni, perche eſſendo la <lb/>coſa in ſe ſteſſa falſiſſima, non ſi potranno per confermarla <lb/>arrecare che ſoli ſofismi. </s>
  <s xml:id="echoid-s1872" xml:space="preserve">E chi ſarà quello, che ſi laſci per-<lb/>ſuadere, che tanto la poca quantità d’acqua, che riempie il <lb/>ſtrettiſſimo vaſo G C, quanto la maggiore, e maggiore, che <lb/>riempiſse vn vaſo maggiore habbia con la ſua preſſione ad <lb/>alzar ſempre la medema grauità di Mercurio KL?</s>
  <s xml:id="echoid-s1873" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1874" xml:space="preserve">_Matem._ </s>
  <s xml:id="echoid-s1875" xml:space="preserve">E pure Sig. </s>
  <s xml:id="echoid-s1876" xml:space="preserve">Ofredi l’effetto è certiſſimo, e di eſſo il Sig. <lb/></s>
  <s xml:id="echoid-s1877" xml:space="preserve">Sinclaro n’hauerebbe potuto aſſegnare vna ragione, per mio <lb/>credere, aſſai euidente, e congrua, quando haueſſe conſide-<lb/>rata la cagione perche nel tubo ritorto, il liquido s’equili-<lb/>bra alla medema altezza, non oſtante che la gamba più groſ-<lb/>ſa ne contenga maggior quantità, che la più ſottile.</s>
  <s xml:id="echoid-s1878" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1879" xml:space="preserve">_Ofred._ </s>
  <s xml:id="echoid-s1880" xml:space="preserve">La cagione di queſto effetto la sò molto bene, perche <lb/>viene aſſegnata dal famoſiſſimo noſtro Galileo nelli galleg-<lb/>gianti _alla pagina_ 15. </s>
  <s xml:id="echoid-s1881" xml:space="preserve">oue potrà vederſi da chi hauerà cu-<lb/>rioſità.</s>
  <s xml:id="echoid-s1882" xml:space="preserve"/>
</p>
<pb o="57" file="00063" n="63" rhead="SECONDO"/>
<p>
  <s xml:id="echoid-s1883" xml:space="preserve">_Conte._ </s>
  <s xml:id="echoid-s1884" xml:space="preserve">Caro Sig. </s>
  <s xml:id="echoid-s1885" xml:space="preserve">Ofredi l’aſſegni V. </s>
  <s xml:id="echoid-s1886" xml:space="preserve">S. </s>
  <s xml:id="echoid-s1887" xml:space="preserve">perche per hora io non <lb/>hò volontà d’andar à vedere, coſa dica il Galileo.</s>
  <s xml:id="echoid-s1888" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1889" xml:space="preserve">_Ofred._ </s>
  <s xml:id="echoid-s1890" xml:space="preserve">V. </s>
  <s xml:id="echoid-s1891" xml:space="preserve">S. </s>
  <s xml:id="echoid-s1892" xml:space="preserve">ha piacere ch’io ricucini li Cauoli: </s>
  <s xml:id="echoid-s1893" xml:space="preserve">biſogna ſeruirla. <lb/></s>
  <s xml:id="echoid-s1894" xml:space="preserve">Io credo che V. </s>
  <s xml:id="echoid-s1895" xml:space="preserve">S. </s>
  <s xml:id="echoid-s1896" xml:space="preserve">s’arricordi beniſſimo di quella propoſitio-<lb/>ne fondamentale della mecanica, viſta anco dalli ciechi nati, <lb/>cioè che nella leua A B, nella quale ſia il ſoſtentacolo C, vna <lb/>pochiſſima forza, ò peſo poſto in A, è ſufficiente à ſoſtenere <lb/>vn grandiſſimo peſo poſto in B, ogni qual volta che la pro-<lb/>portione, che hà il peſo poſto in B, à quello poſto in A, l’hab-<lb/>bia reciprocamente la diſtanza A C, alla diſtanza C B.</s>
  <s xml:id="echoid-s1897" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1898" xml:space="preserve">_Conte._ </s>
  <s xml:id="echoid-s1899" xml:space="preserve">Non vuole ch’io la vedi, mentre per gratia di Dio, ſono <lb/>nato con tutti due li occhi, che fanno anco beniſſimo il lo-<lb/>ro vfficio? </s>
  <s xml:id="echoid-s1900" xml:space="preserve">Me l’arricordo adunque, e sò ch’è il fondamento <lb/>della no tra ſtadera, nella quale il picciol Marco, ò Romano <lb/>poſto in A, equilibra il gran peſo poſto in B.</s>
  <s xml:id="echoid-s1901" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1902" xml:space="preserve">_Ofred._ </s>
  <s xml:id="echoid-s1903" xml:space="preserve">Il punto ſtà in ſapere la cagione di queſto equilibrio. </s>
  <s xml:id="echoid-s1904" xml:space="preserve">Vna <lb/>aſſai probabile, e congrua n’aſſegna il medemo Galileo nel-<lb/>la ſua mecanica, cioè che hauendo momẽti eguali, la natura <lb/>non intraprẽde à far le coſe irragioneuoli; </s>
  <s xml:id="echoid-s1905" xml:space="preserve">quale ſarebbe ſe ſi <lb/>moueſſero; </s>
  <s xml:id="echoid-s1906" xml:space="preserve">poiche ſe il graue B, maggiore diſcẽdeſſe in E, &amp; </s>
  <s xml:id="echoid-s1907" xml:space="preserve"><lb/>alzaſſe il minor peſo A, in D, il B, ſi ſarebbe moſſo per l’arco <lb/>BE, e l’A, ſi ſarebbe moſſo per l’arco D A, maggiore di BE, nel <lb/>medemo tẽpo, &amp; </s>
  <s xml:id="echoid-s1908" xml:space="preserve">in cõſeguẽza cõ maggior velocità. </s>
  <s xml:id="echoid-s1909" xml:space="preserve">E pche <lb/>
<anchor type="figure" xlink:label="fig-00063-01a" xlink:href="fig-00063-01"/>
il graue B, al graue A, hà la proportione, che ha la’diſtanza <lb/>A C, alla diſtanza C B; </s>
  <s xml:id="echoid-s1910" xml:space="preserve">e queſta è la medema che quella dell’-<lb/>arco D A, all’ arco BE; </s>
  <s xml:id="echoid-s1911" xml:space="preserve">cioè che quella della velocità, con la
<pb o="58" file="00064" n="64" rhead="DIALOGO"/>
quale è ſalito il graue A, in D, à quella, con la quale è diſceſo <lb/>il graue B, in E. </s>
  <s xml:id="echoid-s1912" xml:space="preserve">Adunque come il graue B, al graue A, coſi <lb/>reciprocamente la velocità della ſalita dell’A, alla ſceſa del <lb/>graue B. </s>
  <s xml:id="echoid-s1913" xml:space="preserve">Adunque il compoſto del B, è della velocità della <lb/>ſua diſceſa, ſaria eguale al compoſto del graue A, e della ve-<lb/>locità della ſua aſceſa. </s>
  <s xml:id="echoid-s1914" xml:space="preserve">Ma queſti compoſti ſariano li mo-<lb/>menti, che eſercitariano li predetti graui A, B: </s>
  <s xml:id="echoid-s1915" xml:space="preserve">adunque que-<lb/>ſti con momenti eguali, ſi moueriano. </s>
  <s xml:id="echoid-s1916" xml:space="preserve">Il che non è ragio-<lb/>neuole.</s>
  <s xml:id="echoid-s1917" xml:space="preserve"/>
</p>
<div xml:id="echoid-div13" type="float" level="2" n="4">
  <figure xlink:label="fig-00063-01" xlink:href="fig-00063-01a">
    <image file="00063-01" xlink:href="http://echo.mpiwg-berlin.mpg.de/zogilib?fn=/permanent/library/9EXVCG1R/figures/00063-01"/>
  </figure>
</div>
<p>
  <s xml:id="echoid-s1918" xml:space="preserve">_Conte._ </s>
  <s xml:id="echoid-s1919" xml:space="preserve">Anco queſta cagione mi è nottiſſima; </s>
  <s xml:id="echoid-s1920" xml:space="preserve">ſe bene V. </s>
  <s xml:id="echoid-s1921" xml:space="preserve">S. </s>
  <s xml:id="echoid-s1922" xml:space="preserve">l’hà di-<lb/>moſtrata molto ſoſſeguatamente, quaſi parlando dal Tripie <lb/>de. </s>
  <s xml:id="echoid-s1923" xml:space="preserve">Parmi però che queſta cagione ſia diffettoſa, mentre di <lb/>vn effetto poſitiuo, che è il ſtar quieta la leua, ſi adduce per <lb/>cauſa le velocità, con le quali li peſi ſi mouerrebbero; </s>
  <s xml:id="echoid-s1924" xml:space="preserve">le qua-<lb/>li mai ſono ſtate in natura. </s>
  <s xml:id="echoid-s1925" xml:space="preserve">Parmi che d’effetto poſitiuo, po-<lb/>ſitiua anco debba eſſer la cauſa.</s>
  <s xml:id="echoid-s1926" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1927" xml:space="preserve">_Ofred._ </s>
  <s xml:id="echoid-s1928" xml:space="preserve">Non mi pare nuouo nelle coſe, che ſe dimoſtrano, <lb/>il procedere _per deductionem ad impoſſibile,_ demoſtran-<lb/>do che quando foſſe vero il contrario, ne ſeguiſſe vn’aſſur. <lb/></s>
  <s xml:id="echoid-s1929" xml:space="preserve">dità in natura, e coſa irragioneuole. </s>
  <s xml:id="echoid-s1930" xml:space="preserve">Onde eſſendo vero <lb/>che la natura nõ intraprende à fare la coſe irragioneuoli, ſa-<lb/>rà anco vero, che quella coſa non potrà eſſere. </s>
  <s xml:id="echoid-s1931" xml:space="preserve">Congrua-<lb/>mente adunque ſi dimoſtra, che nella leua non ſegua moto <lb/>alcuno, perche il peſo minore ſi mouerebbe con tanta mag-<lb/>gior velocità del peſo maggiore, quanto più queſto foſſe <lb/>maggiore di quello. </s>
  <s xml:id="echoid-s1932" xml:space="preserve">E già è notiſſimo al ſenſo, che la veloci. </s>
  <s xml:id="echoid-s1933" xml:space="preserve"><lb/>tà compenſarà molto bene la forza, &amp; </s>
  <s xml:id="echoid-s1934" xml:space="preserve">il peſo. </s>
  <s xml:id="echoid-s1935" xml:space="preserve">Di modo che <lb/>picciol forza, e picciol peſo moſſi con velocità grande, poſ-<lb/>ſono fare il medemo effetto, che gran forza, e gran peſo <lb/>mo ſſi con pochiſſima velocità.</s>
  <s xml:id="echoid-s1936" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1937" xml:space="preserve">_Conte._ </s>
  <s xml:id="echoid-s1938" xml:space="preserve">Horsù ſupponga V. </s>
  <s xml:id="echoid-s1939" xml:space="preserve">S. </s>
  <s xml:id="echoid-s1940" xml:space="preserve">che io habbia inteſo, e m’arricor-<lb/>di ogni coſa.</s>
  <s xml:id="echoid-s1941" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1942" xml:space="preserve">_Ofred_ Quando V. </s>
  <s xml:id="echoid-s1943" xml:space="preserve">S. </s>
  <s xml:id="echoid-s1944" xml:space="preserve">hà inteſo, e s’arricorda tutte queſte coſe, in-<lb/>tenderà anco ſubito come paſſi il negotio nel tubo ritorto. <lb/></s>
  <s xml:id="echoid-s1945" xml:space="preserve">Nel quale è veriſſimo, che l’acqua della gamba G D, eſsendo <lb/>molto maggiore di quella della gamba L I, è anco d’eſsa <lb/>molto più graue; </s>
  <s xml:id="echoid-s1946" xml:space="preserve">nulladimeno s’equilibrano, e non ne ſegue <lb/>moto, perche alla piccioliſſima, e tarda diſceſa della mag-
<pb o="59" file="00065" n="65" rhead="SECONDO"/>
giore v. </s>
  <s xml:id="echoid-s1947" xml:space="preserve">g. </s>
  <s xml:id="echoid-s1948" xml:space="preserve">per G Q, nel medemo tempo s’accompagnarebbe <lb/>la velociſſima ſalita per A L; </s>
  <s xml:id="echoid-s1949" xml:space="preserve">la quale è tanto maggiore del-<lb/>la G Q, di quanto l’ampiezza del vaſo G D, è maggiore della <lb/>
<anchor type="figure" xlink:label="fig-00065-01a" xlink:href="fig-00065-01"/>
larghezza della canna LI. </s>
  <s xml:id="echoid-s1950" xml:space="preserve">La velocità adunque L A, com-<lb/>penſaria la tardità L I. </s>
  <s xml:id="echoid-s1951" xml:space="preserve">Io hò detto quanto doueuo; </s>
  <s xml:id="echoid-s1952" xml:space="preserve">ma non <lb/>sò già vedere come queſte dottrine militino anco nelli Fe-<lb/>nomeni del Sig. </s>
  <s xml:id="echoid-s1953" xml:space="preserve">Sinclaro.</s>
  <s xml:id="echoid-s1954" xml:space="preserve"/>
</p>
<div xml:id="echoid-div14" type="float" level="2" n="5">
  <figure xlink:label="fig-00065-01" xlink:href="fig-00065-01a">
    <image file="00065-01" xlink:href="http://echo.mpiwg-berlin.mpg.de/zogilib?fn=/permanent/library/9EXVCG1R/figures/00065-01"/>
  </figure>
</div>
<p>
  <s xml:id="echoid-s1955" xml:space="preserve">_Matem._ </s>
  <s xml:id="echoid-s1956" xml:space="preserve">Ho paura che V. </s>
  <s xml:id="echoid-s1957" xml:space="preserve">S. </s>
  <s xml:id="echoid-s1958" xml:space="preserve">dica ciò per burlarmi. </s>
  <s xml:id="echoid-s1959" xml:space="preserve">Che, che pe-<lb/>rò ſia, ſupponga ch’il vaſo G C, ſia il doppio della fiſtola PV. <lb/></s>
  <s xml:id="echoid-s1960" xml:space="preserve">All’hora chi peſaſse in vna bilancia, e l’acqua del vaſo G C, e <lb/>il Mercurio L K, peſarebbero egualmente, perche la propor-<lb/>tione, che hà la grauità ſpecifica del Mercurio, alla grauità <lb/>ſpecifica dell’acqua, l’ha l’altezza dell’acqua, a quella del <lb/>Mercurio reciprocamente. </s>
  <s xml:id="echoid-s1961" xml:space="preserve">Onde peſando egualmente, ſi fa-<lb/>rà l’equilibrio. </s>
  <s xml:id="echoid-s1962" xml:space="preserve">Queſto è dimoſtrato comunemente da tutti <lb/>li Mecanici.</s>
  <s xml:id="echoid-s1963" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1964" xml:space="preserve">_Oſred._ </s>
  <s xml:id="echoid-s1965" xml:space="preserve">Biſogna certo che ſe V. </s>
  <s xml:id="echoid-s1966" xml:space="preserve">S. </s>
  <s xml:id="echoid-s1967" xml:space="preserve">vuol eſser inteſo, dimoſtri que-
<pb o="60" file="00066" n="66" rhead="DIALOGO"/>
ſto ſuo aſſerto, altrimente può far di meno di dir altro.</s>
  <s xml:id="echoid-s1968" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1969" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s1970" xml:space="preserve">Hò inteſo. </s>
  <s xml:id="echoid-s1971" xml:space="preserve">V. </s>
  <s xml:id="echoid-s1972" xml:space="preserve">S. </s>
  <s xml:id="echoid-s1973" xml:space="preserve">non vuol eſser ſolo a ricucinare Cauoli. <lb/></s>
  <s xml:id="echoid-s1974" xml:space="preserve">E qual coſa è dimoſtrata da più Mecanici della ſeguente</s>
</p>
</div>
<div xml:id="echoid-div16" type="section" level="1" n="9">
<head xml:id="echoid-head8" xml:space="preserve">PROPOSITIONE?</head>
  <figure>
    <image file="00066-01" xlink:href="http://echo.mpiwg-berlin.mpg.de/zogilib?fn=/permanent/library/9EXVCG1R/figures/00066-01"/>
  </figure>
<p style="it">
  <s xml:id="echoid-s1975" xml:space="preserve">Se la proportione, che hà la granità ſpecifica del graue A, alla gr auità <lb/>ſpecifica del graue B, l’hauerà reciprocamente la magnitudine B, al-<lb/>la magnitudine A: </s>
  <s xml:id="echoid-s1976" xml:space="preserve">li peſi aſſoluti di A, e B, ſaranno eguali.</s>
  <s xml:id="echoid-s1977" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1978" xml:space="preserve">Intendaſi la magnitudine C, eguale alla B, e della medema gra-<lb/>uità in ſpecie dell’A. </s>
  <s xml:id="echoid-s1979" xml:space="preserve">La grauità aſſoluta di A, alla grauità <lb/>aſſoluta di B, hauerà la proportione compoſta della grauità <lb/>aſſoluta di A, alla grauità aſſoluta di C, e di quella di que-<lb/>ſta, alla grauità aſſoluta di B. </s>
  <s xml:id="echoid-s1980" xml:space="preserve">Ma la grauità aſſoluta di A, all’ <lb/>aſſoluta di C, è come la mole A, alla C, (perche ſono della <lb/>medema ſpecie;) </s>
  <s xml:id="echoid-s1981" xml:space="preserve">e ia grauità aſſoluta di C, all’aſsoluta di B, e <lb/>come la ſpecifica di C, alla ſpecifica di B; </s>
  <s xml:id="echoid-s1982" xml:space="preserve">cioè come la ſpe-<lb/>cifica di A, alla ſpecifica di B; </s>
  <s xml:id="echoid-s1983" xml:space="preserve">cioè (per il ſuppoſto) come <lb/>la magnitudine B, alla magnitudine A. </s>
  <s xml:id="echoid-s1984" xml:space="preserve">Adunque la grauità <lb/>aſsoluta di A, all’aſsoluta di B, hauerà la proportione com-<lb/>poſta della magnitudine A, alla C; </s>
  <s xml:id="echoid-s1985" xml:space="preserve">cioè alla B; </s>
  <s xml:id="echoid-s1986" xml:space="preserve">e di quella del-<lb/>la magnitudine B, all’A. </s>
  <s xml:id="echoid-s1987" xml:space="preserve">Ma queſte due ragioni fanno quel-<lb/>la d’egualità. </s>
  <s xml:id="echoid-s1988" xml:space="preserve">Adunque A, e B, peſaranno egualmente.</s>
  <s xml:id="echoid-s1989" xml:space="preserve"/>
</p>
<pb o="61" file="00067" n="67" rhead="SECONDO."/>
</div>
<div xml:id="echoid-div17" type="section" level="1" n="10">
<head xml:id="echoid-head9" xml:space="preserve">COROLLARIO.</head>
<p>
  <s xml:id="echoid-s1990" xml:space="preserve">Da ciò è manifeſto, che ſe A, e B, ſaranno cilindri di baſi egua-<lb/>li, e che la proportione, che ha la grauità ſpecifica di A, alla <lb/>ſpecifica di B, l’habbia l’altezza di B, all’ altezza di A, che <lb/>queſti cilindri peſaranno egualmente. </s>
  <s xml:id="echoid-s1991" xml:space="preserve">Perche all’hora la ma-<lb/>gnitudine B, alla A, hauerà la medema proportione, che ha <lb/>l’atezza del B, all’altezza dell’A. </s>
  <s xml:id="echoid-s1992" xml:space="preserve">Adũque è vero quanto hab-<lb/>biamo detto, cioè che ſi farà l’equilibrio del Mercurio, e del-<lb/>l’Acqua.</s>
  <s xml:id="echoid-s1993" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s1994" xml:space="preserve">E da queſta digreſſione ritornando al noſtro propoſito, dicia-<lb/>mo che in virtù delle dottrine del Signor Ofredi ſopra aſſe-<lb/>gnate, ne ſegue, che s’ha uerà il medemo equilibrio ſe il vaſo <lb/>GC, ſarà maggiore quanto ſi voglia della Fiſtola PV; </s>
  <s xml:id="echoid-s1995" xml:space="preserve">perche <lb/>ſe bene peſarà l’ acqua molto più, non può però l’ acqua di-<lb/>ſcendere ſe non fa aſcendere il Mercurio;</s>
  <s xml:id="echoid-s1996" xml:space="preserve">ma la ſalita di que-<lb/>ſto per la canna ſarebbe tanto più veloce della diſceſa dell’-<lb/>acqua, quanto queſta peſaſſe più di quello; </s>
  <s xml:id="echoid-s1997" xml:space="preserve">onde di queſta <lb/>grauità, e velocità ne reſultarebbero momenti eguali. </s>
  <s xml:id="echoid-s1998" xml:space="preserve">Per-<lb/>ciò adunque non vi è ragione perche ne habbia da ſeguir <lb/>moto, bensì equilibrio, mentre la natura non intra prende a <lb/>fare coſe irragioneuoli. </s>
  <s xml:id="echoid-s1999" xml:space="preserve">Nel medemo modo ſe il vaſo con-<lb/>tenente l’acqua ſi reſtringeſſe in guiſa, che foſſe meno largo <lb/>della canna, all’hora l’acqua deſcenderebbe con tanta mag-<lb/>gior velocità ſopra quella, che ſaliſce il Mercurio LK, quã-<lb/>to queſto foſſe più graue dell’acqua. </s>
  <s xml:id="echoid-s2000" xml:space="preserve">Onde per la medema <lb/>cagione ne ſeguirebbe l’equilibrio. </s>
  <s xml:id="echoid-s2001" xml:space="preserve">Le medeme ragioni mi-<lb/>litano per il Baroſcopio, e Cilindri dell’aria, ch’equilibrano <lb/>il Mercurio.</s>
  <s xml:id="echoid-s2002" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2003" xml:space="preserve">_Conte_. </s>
  <s xml:id="echoid-s2004" xml:space="preserve">V. </s>
  <s xml:id="echoid-s2005" xml:space="preserve">S. </s>
  <s xml:id="echoid-s2006" xml:space="preserve">ha ſuppoſto, che nel tubo ritorto ACDF, il liqui-<lb/>do s’equilibri alle medeme altezze L, G, il che repugna all’-<lb/>eſperienza; </s>
  <s xml:id="echoid-s2007" xml:space="preserve">perche il Dottiſſimo Sig. </s>
  <s xml:id="echoid-s2008" xml:space="preserve">Geminiano Montanari <lb/>noſtro grand’amico, auertiſce _nelli ſuoi penſieri Fiſico-Matema-_ <lb/>_tici all’Eſperienza_ 13. </s>
  <s xml:id="echoid-s2009" xml:space="preserve">e parimente il Dottiſſimo P. </s>
  <s xml:id="echoid-s2010" xml:space="preserve">Fabri _nel_ <lb/>_Dial._ </s>
  <s xml:id="echoid-s2011" xml:space="preserve">4. </s>
  <s xml:id="echoid-s2012" xml:space="preserve">che riempito il Tubo d’acqua, queſta s’alza più nella <lb/>gãba più ſtretta, quanto più queſta è ſottile. </s>
  <s xml:id="echoid-s2013" xml:space="preserve">Il medemo dice <lb/>il Montanari ſuccedere dell’argento viuo _nell’ Eſperienza_ 23.</s>
  <s xml:id="echoid-s2014" xml:space="preserve">
<pb o="62" file="00068" n="68" rhead="DIALOGO"/>
poiche ſe il cannellino ſottile ſarà d’oro, e che s’infonda nel <lb/>tubo argento viuo, queſto ſalirà più nel cannellino, che nel-<lb/>la gamba più larga.</s>
  <s xml:id="echoid-s2015" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2016" xml:space="preserve">_Matem_, Credo, che queſt’eſperienze ſiino ben vere, ma però la <lb/>differenza è molto poca, ne hà che fare con la differenza <lb/>grande del peſo, che ſi ritrouatrà le parti del fluido cõtenuto <lb/>entro le doi gãbe; </s>
  <s xml:id="echoid-s2017" xml:space="preserve">quale naſce da cauſa molto diuerſa, che da <lb/>queſto peſo; </s>
  <s xml:id="echoid-s2018" xml:space="preserve">la quale biſogna, che ſia la medema, che quella <lb/>che fa ſalire l’acqua nelli cannellini di vetro aperti d’ ambe <lb/>le parti, li quali auuicinati all’acqua così leggermẽte, che ap-<lb/>pena la tocchino, ſubito queſta ſaliſce ſopra il liuello dell’al-<lb/>tra ad vna tal altezza, conforme che li cannelli ſono più, e <lb/>meno ſottili.</s>
  <s xml:id="echoid-s2019" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2020" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s2021" xml:space="preserve">Queſt’ effetto viene attribuito dalli Inſigni Filoſoſi Boile, <lb/>Sinclaro, e Fabri alla diuerſa preſſione dell’ aria, che <lb/>premendo più ſopra l’acqua circonſtante al cannellino, che <lb/>ſopra quella ſottopoſta alla ſua cauità, facia ſalire queſta, <lb/>come meno premuta. </s>
  <s xml:id="echoid-s2022" xml:space="preserve">Pure alla preſſione dell’aria viene at-<lb/>tribuito, dal Sig. </s>
  <s xml:id="echoid-s2023" xml:space="preserve">Montanari, ma in modo differente dalli ſo-<lb/>pradetti.</s>
  <s xml:id="echoid-s2024" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2025" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s2026" xml:space="preserve">Pure alla diuerſa preſſione l’attribuirei io, fondandolo <lb/>in ragioni, parmi vn poco plauſibili, e nõ toccate dalli ſopra <lb/>citati Auttori; </s>
  <s xml:id="echoid-s2027" xml:space="preserve">quando non vi foſſero eſperienze, vien detto, <lb/>in contrario.</s>
  <s xml:id="echoid-s2028" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2029" xml:space="preserve">_Conte_. </s>
  <s xml:id="echoid-s2030" xml:space="preserve">Io ſentirei però volontieri queſte ſue ragioni.</s>
  <s xml:id="echoid-s2031" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2032" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s2033" xml:space="preserve">Et io vorrei vedere l’eſperienze in contrario.</s>
  <s xml:id="echoid-s2034" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2035" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s2036" xml:space="preserve">Io diſcorrerò in queſta guiſa. </s>
  <s xml:id="echoid-s2037" xml:space="preserve">Non vi è forſe trà tutti li <lb/>corpi il più Eterogeneo dell’aria, contenendo in ſe ſteſſa vn <lb/>infinita varietà d’effluuii, che eſcono da tutta la diuerſità del-<lb/>li corpi, li quali ſono quelli, che la conſtituiſcono principal-<lb/>mente, e forſe totalmẽte, nel genere de graui. </s>
  <s xml:id="echoid-s2038" xml:space="preserve">Queſti effluuii <lb/>poi ſono di differentiſſime figure, e perciò in eſſa differentiſ-<lb/>ſimamente collocati; </s>
  <s xml:id="echoid-s2039" xml:space="preserve">lunghi, ſtorti, à ſpira, e diuerſamente <lb/>trà ſe intrigati; </s>
  <s xml:id="echoid-s2040" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s2041" xml:space="preserve">hauendo diuerſi ſiti, molti di eſſi ſono ori-<lb/>zontalmente conſtituiti. </s>
  <s xml:id="echoid-s2042" xml:space="preserve">Queſta loro conſtitutione, ſe non <lb/>la totale, almeno vna delle principali cagioni ſaria da me <lb/>ſtimata di queſto Fenomeno. </s>
  <s xml:id="echoid-s2043" xml:space="preserve">E per intender il come, pigli-<lb/>no vn cannone competentemente groſſo, e lo collochino
<pb o="63" file="00069" n="69" rhead="SECONDO."/>
perpendicolare ſopra il pauimento, poi li ſparghino ſopra, <lb/>&amp; </s>
  <s xml:id="echoid-s2044" xml:space="preserve">all’intorno quàntità cõſiderabile di Paglia, Fieno, Lana, ò <lb/>ſimil materia. </s>
  <s xml:id="echoid-s2045" xml:space="preserve">Vedranno che il cannone non ſarà rie mpito <lb/>di quella materia, con quella conſtipatione, con la quale è <lb/>conſtipata la parte di fuori; </s>
  <s xml:id="echoid-s2046" xml:space="preserve">perche molti di quelli fili, <lb/>maſſime quelli, che benche ſtorti, ſono però diſteſiaſſai ori-<lb/>zontalmente, incontrando li orli del vaſo, non li poſſono en. <lb/></s>
  <s xml:id="echoid-s2047" xml:space="preserve">trare, ma cadono di fuori. </s>
  <s xml:id="echoid-s2048" xml:space="preserve">Di più molti di quelli, che entrano, <lb/>e che ſe non foſſe il cannone, ſarebbono collocati orizon-<lb/>talmente nel modo detto, ſtriſciādo per li lati di eſſo, appog-<lb/>giano ad eſſo, ò cõ vna, ò con ambedue l’eſtremità. </s>
  <s xml:id="echoid-s2049" xml:space="preserve">Di quelli <lb/>poi, che fuori del cannone ſopraſtano ad eſſo, s’appoggiano <lb/>ſopra li lati, ne aggrauano ſopra quelli contenuti nel canno-<lb/>ne, non ſarà premuto proportionalmente, come il pauimẽ-<lb/>to all’intorno. </s>
  <s xml:id="echoid-s2050" xml:space="preserve">Vn ſimil accidente mi parerebbe che doueſse <lb/>accadere alli effluuii, che compongono l’aria, ò atomosfera. </s>
  <s xml:id="echoid-s2051" xml:space="preserve"><lb/>Molti di queſti, che con vna delle ſue parti occuparebbero il <lb/>ſpacio vuoto del cannoncino, non lo poſſono occupare, per-<lb/>che vrtando nelli orli d’eſso, ſtanno di fuori. </s>
  <s xml:id="echoid-s2052" xml:space="preserve">A ltri, che ben-<lb/>che ſtorti, ſono però diſteſi aſſai orizontalmente, entrando <lb/>nel cannoncino, s’appoggiano con vna, ò tuttel’ eſtremità <lb/>alla ſuperficie interiore, ſi vanno ſtriſciando ſopra eſsa. </s>
  <s xml:id="echoid-s2053" xml:space="preserve">Vna <lb/>differenza però viè trà il cannone, e il cannellino, che que-<lb/>lo viene riempito di Fieno, &amp;</s>
  <s xml:id="echoid-s2054" xml:space="preserve">c. </s>
  <s xml:id="echoid-s2055" xml:space="preserve">da vna bocca ſola, e non <lb/>vi è difficoltà, che ſe ſi poteſse far queſto ſpargimento di ſo-<lb/>pra, e di ſotto, che maggior quantità n’entrarebbe, e dentro <lb/>ſarebbe più conſtipato. </s>
  <s xml:id="echoid-s2056" xml:space="preserve">Ma il cannellino è riempito dall’a-<lb/>ria, che li entra da tutte due le parti, premendo queſta, e ſo-<lb/>pra, e ſotto con la medema energia. </s>
  <s xml:id="echoid-s2057" xml:space="preserve">E però ben vero, che <lb/>non ſi può leuare l’impedimento, che arrecca l’interior ſu-<lb/>perficie del cannellino, mentre molte eſtremità delli com-<lb/>ponenti l’aria s’appoggiano ad’eſſa, e dal contatto ſono im-<lb/>pediti dall’eſercitar tutto il loro momento ſopra l’acqua ſo@ <lb/>topoſtoli; </s>
  <s xml:id="echoid-s2058" xml:space="preserve">il quale eſercitarebbero, quando liberi non foſſe-<lb/>ro rachiuſi nel cannellino. </s>
  <s xml:id="echoid-s2059" xml:space="preserve">Il quale impedimento è tanto <lb/>maggiore, quanto più ſottile è il cannellino, poiche la ſu-<lb/>perficie decreſce meno, di quello decreſca il corpo.</s>
  <s xml:id="echoid-s2060" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2061" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s2062" xml:space="preserve">Hor quà sì, che biſogna romper il ſilentio, poiche così
<pb o="64" file="00070" n="70" rhead="DIALOGO"/>
alla prima non capiſco queſta dottrina.</s>
  <s xml:id="echoid-s2063" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2064" xml:space="preserve">_Conte_. </s>
  <s xml:id="echoid-s2065" xml:space="preserve">V. </s>
  <s xml:id="echoid-s2066" xml:space="preserve">S. </s>
  <s xml:id="echoid-s2067" xml:space="preserve">pur di ſopra mi ha ſpauentato con la ſua gran Geo-<lb/>metria, &amp; </s>
  <s xml:id="echoid-s2068" xml:space="preserve">hora non intende queſta coſciutia? </s>
  <s xml:id="echoid-s2069" xml:space="preserve">Io gle la di-<lb/>chiarerò ſuccintamente anco ſenza ſchema. </s>
  <s xml:id="echoid-s2070" xml:space="preserve">S’imagini due <lb/>cannellini della medema altezza, di modo che il diametro <lb/>della baſe del vano dell’vno, ſia doppia del diametro del va-<lb/>no della baſe dell’altro. </s>
  <s xml:id="echoid-s2071" xml:space="preserve">Il corpo del vano del maggiore, ſarà <lb/>quadruplo del vano del minore; </s>
  <s xml:id="echoid-s2072" xml:space="preserve">perche li cilindri della me-<lb/>dema altezza hanno la proportione delle baſi; </s>
  <s xml:id="echoid-s2073" xml:space="preserve">e di queſte la <lb/>maggiore è quadrupla della minore, eſſendo il diametro <lb/>doppio del diametro. </s>
  <s xml:id="echoid-s2074" xml:space="preserve">Mà la ſuperficie del maggiore è ſolo <lb/>doppia di quella del minore, perche queſte hanno la pro-<lb/>portione, che hanno le baſi, che ſono le circonferenze; </s>
  <s xml:id="echoid-s2075" xml:space="preserve">che <lb/>hanno poi la medema proportione delli diametri. </s>
  <s xml:id="echoid-s2076" xml:space="preserve">Ecco <lb/>adunque che la ſuperficie del minore meno decreſce da <lb/>quella del maggiore, di quello decreſca la corpulenza.</s>
  <s xml:id="echoid-s2077" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2078" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s2079" xml:space="preserve">Hò inteſo. </s>
  <s xml:id="echoid-s2080" xml:space="preserve">Ritorno al mio ſilentio. </s>
  <s xml:id="echoid-s2081" xml:space="preserve">Non ſi ſtupiſchi ſe <lb/>ſono ſtato così pigro nell’intendere, perche <lb/>_Quandoque bonus dormitat Homerus_.</s>
  <s xml:id="echoid-s2082" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2083" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s2084" xml:space="preserve">Io per mc la compatiſco. </s>
  <s xml:id="echoid-s2085" xml:space="preserve">Hauendo adunque inteſo, in-<lb/>tenderà anco come l’impedimento arreccato dal contatto <lb/>con la ſuperficie, non decreſca a proportione con il decre-<lb/>ſcimento del corpo.</s>
  <s xml:id="echoid-s2086" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2087" xml:space="preserve">Queſte cauſe però non poſsono baſtare. </s>
  <s xml:id="echoid-s2088" xml:space="preserve">Perche ſe ciò proce-<lb/>deſſe dalla ſola aria contenuta entro il cannellino, come pa-<lb/>re, che dica principalmente il Sig. </s>
  <s xml:id="echoid-s2089" xml:space="preserve">Sinclaro _Lib. </s>
  <s xml:id="echoid-s2090" xml:space="preserve">2. </s>
  <s xml:id="echoid-s2091" xml:space="preserve">Dial. </s>
  <s xml:id="echoid-s2092" xml:space="preserve">2. </s>
  <s xml:id="echoid-s2093" xml:space="preserve">n. </s>
  <s xml:id="echoid-s2094" xml:space="preserve">7_. <lb/></s>
  <s xml:id="echoid-s2095" xml:space="preserve">ne ſeguirebbe, che quanto più lungo foſse il cannellino, più <lb/>l’acqua doueſse ſalire, il che non s’eſperimenta, poiche ò il <lb/>cannellino ſia lunghiſſimo, ò curtiſſimo, purche ſia ſempre <lb/>della medema ſottigliezza, ſempre l’acqua ſalirà al mede-<lb/>mo ſegno, come dice hauer eſperimentato il Signor Mon-<lb/>tanari _all’eſperienza_ 10. </s>
  <s xml:id="echoid-s2096" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s2097" xml:space="preserve">io pure hò eſperimentato più vol-<lb/>te aſſieme con il Signor Rinaldini, &amp; </s>
  <s xml:id="echoid-s2098" xml:space="preserve">il Sig. </s>
  <s xml:id="echoid-s2099" xml:space="preserve">D. </s>
  <s xml:id="echoid-s2100" xml:space="preserve">Gio. </s>
  <s xml:id="echoid-s2101" xml:space="preserve">Antonio <lb/>Baglioni, Canonico del Saluatore. </s>
  <s xml:id="echoid-s2102" xml:space="preserve">Biſogna adunque anco <lb/>conſiderare altra aria eſteriore ſino al fine dell’ atomosfera, <lb/>la quale preme a perpendicolo ſopra l’inferiore. </s>
  <s xml:id="echoid-s2103" xml:space="preserve">Hora infi-<lb/>niti di quelli eftluuii, che ſono diſteſi orizontalmente, pre-<lb/>mono ſopra li orli del cannellino, &amp; </s>
  <s xml:id="echoid-s2104" xml:space="preserve">in conſeguenza ſono
<pb o="65" file="00071" n="71" rhead="SECONDO."/>
impediti dal premere ſopra l’aria, cheriempieil cannellino; <lb/></s>
  <s xml:id="echoid-s2105" xml:space="preserve">almeno noncon tutto quel momento, con cui premerebbe, <lb/>ro, ſe non s’appoggiaſſero ſopra eſſo. </s>
  <s xml:id="echoid-s2106" xml:space="preserve">E perciò l’acqua ſot-<lb/>topoſta al vacuo del cannellino premuta meno di quello, <lb/>che ſia premuta l’eſteriore,è neceſſitata a ſalire. </s>
  <s xml:id="echoid-s2107" xml:space="preserve">E perche <lb/>queſti impedimenti ſono tanto maggiori, quanto il cannel-<lb/>lino è più ſtretto, perciò l’acqua aſcende più per queſto, che <lb/>peril più largo. </s>
  <s xml:id="echoid-s2108" xml:space="preserve">Ne ſe midica, che ſaliſca anco l’acqua (ben-<lb/>che non tanto quanto dentro) aldifuori del cannellino, per-<lb/>che milita la medema ragione; </s>
  <s xml:id="echoid-s2109" xml:space="preserve">appoggiando molti delli <lb/>componenti l’aria alla ſuperficie eſteriore con vno delli ſuoi <lb/>capi, &amp;</s>
  <s xml:id="echoid-s2110" xml:space="preserve">impediti di premere totalmente dall’appoggiarſi <lb/>ſopra l’orlo del cannellino; </s>
  <s xml:id="echoid-s2111" xml:space="preserve">il che non auuiene in poca di-<lb/>ſtanza da eſſo. </s>
  <s xml:id="echoid-s2112" xml:space="preserve">Corre adunque l’impedimento medemo, ben-<lb/>che non tanto, che dalla parte caua; </s>
  <s xml:id="echoid-s2113" xml:space="preserve">e perciò aſcende anco <lb/>qualche poco dalla parte eſteriore. </s>
  <s xml:id="echoid-s2114" xml:space="preserve">Queſti ſariano li miei <lb/>diſcorſi, li quali però reſtariano atterrati dalle eſperienze in <lb/>contrario.</s>
  <s xml:id="echoid-s2115" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2116" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s2117" xml:space="preserve">Non tardi adunque più a narrarcele.</s>
  <s xml:id="echoid-s2118" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2119" xml:space="preserve">_Mate_. </s>
  <s xml:id="echoid-s2120" xml:space="preserve">Le veda pure V. </s>
  <s xml:id="echoid-s2121" xml:space="preserve">S. </s>
  <s xml:id="echoid-s2122" xml:space="preserve">_nelli Saggi di nuoue eſperienze_ fatte dalli <lb/>famoſiſſimi Accademici del cimento, alla preſenza del Sere-<lb/>niſſimo Prencipe Cardinale Leopoldo, Mecenate de lette-<lb/>rati, in Firenze. </s>
  <s xml:id="echoid-s2123" xml:space="preserve">Ritroui _la pagina_ 100. </s>
  <s xml:id="echoid-s2124" xml:space="preserve">e vedrà con quanta. <lb/></s>
  <s xml:id="echoid-s2125" xml:space="preserve">induſtria habbino tentato il predetto Fenomeno, ò nel vuo. </s>
  <s xml:id="echoid-s2126" xml:space="preserve"><lb/>to, ò in aria eſtenuata;</s>
  <s xml:id="echoid-s2127" xml:space="preserve">e perciò deboliſſima a premere; </s>
  <s xml:id="echoid-s2128" xml:space="preserve">e co-<lb/>me ſempre ſia ſalita l’acqua nel cannellino ſino al medemo <lb/>ſegno, oue aſcendeua nell’aria libera.</s>
  <s xml:id="echoid-s2129" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2130" xml:space="preserve">_Conte_. </s>
  <s xml:id="echoid-s2131" xml:space="preserve">An sì, sì. </s>
  <s xml:id="echoid-s2132" xml:space="preserve">Queſte forſe ſaranno quell’ eſperienze, delle <lb/>quali il noſtro Sig. </s>
  <s xml:id="echoid-s2133" xml:space="preserve">Rinaldiniintende _nel Lib. </s>
  <s xml:id="echoid-s2134" xml:space="preserve">de Reſol. </s>
  <s xml:id="echoid-s2135" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s2136" xml:space="preserve">Comp_. <lb/></s>
  <s xml:id="echoid-s2137" xml:space="preserve">_Mathem. </s>
  <s xml:id="echoid-s2138" xml:space="preserve">pag_. </s>
  <s xml:id="echoid-s2139" xml:space="preserve">160. </s>
  <s xml:id="echoid-s2140" xml:space="preserve">oue narrando l’opinione di quelli, che ſti-<lb/>mano queſto Fenomeno naſcer dalla diuerſa preſſione dell’-<lb/>aria, dice, _Res autem non ſic ſe habet, nam idem contingit in loco_, <lb/>_vbinullus aer, vel ſaltem adeo exiguæ quantitatis, vt vix credas ei_ <lb/>_quidquam deferendum, quod nos Florentiæ ſumus experti_.</s>
  <s xml:id="echoid-s2141" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2142" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s2143" xml:space="preserve">Ne aſſegna egli alcuna cagione?</s>
  <s xml:id="echoid-s2144" xml:space="preserve"/>
</p>
<p style="it">
  <s xml:id="echoid-s2145" xml:space="preserve">Conte. </s>
  <s xml:id="echoid-s2146" xml:space="preserve">_Certo, ſoggiungendo queſte parole:_ </s>
  <s xml:id="echoid-s2147" xml:space="preserve">Sed potius aliundè <lb/>id prouenit, quia ſcilicet dùm exilis ille tubulus immergitur non nibil <lb/>in fluidum, huius pars incluſa in anguſtia ipſius tubuli multum ammit
<pb o="66" file="00072" n="72" rhead="DIALOGO"/>
tit momenti: </s>
  <s xml:id="echoid-s2148" xml:space="preserve">vndè nequit æque ponderare patribus circumiacentibus, <lb/>ſed his vrgentibus prementibusquè cylindrus ex humido intra tubuli <lb/>anguſtiam cedit, eousque aſcendens, vt eius altitudo poſsit in equili-<lb/>brio eſſe cum cylindris ex humido circumiacente. </s>
  <s xml:id="echoid-s2149" xml:space="preserve">Nihil enim refert <lb/>ſiuè deſuper premat, vel non premat aer.</s>
  <s xml:id="echoid-s2150" xml:space="preserve"/>
</p>
<p style="it">
  <s xml:id="echoid-s2151" xml:space="preserve">Ofre. </s>
  <s xml:id="echoid-s2152" xml:space="preserve">_Io intenderei volontieri come_ dum exilis ille tubulus immer-<lb/>gitur non nihil in fluidum, huius pars incluſa in anguſtia ipſius tubu-<lb/>li multum ammittit momenti.</s>
  <s xml:id="echoid-s2153" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2154" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s2155" xml:space="preserve">Dice _alla pagina_ 175 perderſi per cagione del contatto <lb/>del Mercurio con la cauità della fiſtola, della qual coſa m@ <lb/>ha detto che per ſaluar tutti li Fenomeni, ne vuol diſcorre-<lb/>re più difuſamente. </s>
  <s xml:id="echoid-s2156" xml:space="preserve">Ma già ch’io deuo far certe conſidera-<lb/>tioni ſopra altrieffetti della preſſione ſpiegati dal Sig. </s>
  <s xml:id="echoid-s2157" xml:space="preserve">Sin-<lb/>claro, circa li quali parmi che ſi poſſa dire alcuna coſa di <lb/>queſto minor momento, non mancarò di rappreſentarla <lb/>hora. </s>
  <s xml:id="echoid-s2158" xml:space="preserve">Dice il Sig. </s>
  <s xml:id="echoid-s2159" xml:space="preserve">Sinclaro _Lib_. </s>
  <s xml:id="echoid-s2160" xml:space="preserve">1. </s>
  <s xml:id="echoid-s2161" xml:space="preserve">_Dial_. </s>
  <s xml:id="echoid-s2162" xml:space="preserve">5._</s>
  <s xml:id="echoid-s2163" xml:space="preserve">n_.</s>
  <s xml:id="echoid-s2164" xml:space="preserve">4. </s>
  <s xml:id="echoid-s2165" xml:space="preserve">che hauendo pre-<lb/>fovn Baroſcopio minoredi 29. </s>
  <s xml:id="echoid-s2166" xml:space="preserve">diti (che è quell’ altezza al-<lb/>la quale s’equilibra il Mercurio con l’aria) &amp; </s>
  <s xml:id="echoid-s2167" xml:space="preserve">riempitolo di <lb/>Mercurio, e poſtolo nel Mercurio del vaſo, non ne vſciua <lb/>parte alcuna; </s>
  <s xml:id="echoid-s2168" xml:space="preserve">ma che anco alzata la canna fuori del Mercu-<lb/>rio nell’aria libera, non perciò ne vſciua. </s>
  <s xml:id="echoid-s2169" xml:space="preserve">Auertiſce pe-<lb/>rò che _hoc Phęnomenon ſolummodo contingit, cum tubi orificium_, <lb/>_ciusque cauitas anguſta admodum fuerit_. </s>
  <s xml:id="echoid-s2170" xml:space="preserve">Mà quando ſi ſeruì d’-<lb/>vn tubo largo, dice; </s>
  <s xml:id="echoid-s2171" xml:space="preserve">_Non priùs eundem extra ſtagnantem Mercu-_ <lb/>_rium in apertum aerem extraxi quam confeſtim Hydrargirum delabi_, <lb/>_externumque aerem tubi cauitatem ſubintrare conſpexi_. </s>
  <s xml:id="echoid-s2172" xml:space="preserve">Dice però <lb/>eſſer gran differenza, quando il Mercurio eſce dal tubo lar-<lb/>go; </s>
  <s xml:id="echoid-s2173" xml:space="preserve">che ſia minore di 29. </s>
  <s xml:id="echoid-s2174" xml:space="preserve">diti, ò maggiore; </s>
  <s xml:id="echoid-s2175" xml:space="preserve">perche dal mag. <lb/></s>
  <s xml:id="echoid-s2176" xml:space="preserve">giore _Perfacile, plenoque defluit, aonec ad uſitatam altitudinem_ <lb/>_peruenerit; </s>
  <s xml:id="echoid-s2177" xml:space="preserve">idque absque ingreſſu, vel minimæ alicuius aeris par-_ <lb/>_ticulæ. </s>
  <s xml:id="echoid-s2178" xml:space="preserve">Ex illo autem non abſque difficultate contingit efflu-_ <lb/>_xus. </s>
  <s xml:id="echoid-s2179" xml:space="preserve">Quoniamaer non minus ingredi, quam Hydrargirus egredi cona-_ <lb/>_tur; </s>
  <s xml:id="echoid-s2180" xml:space="preserve">imò defluente hoc, ſubintrat ille_, al modo che _Idem cernere eſt_ <lb/>_dum aquam vel vinum ex vaſe anguſti orificij effundis: </s>
  <s xml:id="echoid-s2181" xml:space="preserve">effluente enim_ <lb/>_aqua vitinus in eius locum ſuccedit aer_. </s>
  <s xml:id="echoid-s2182" xml:space="preserve">Vuole che tutti queſti <lb/>effetti prouenghino dalla preſſione dell’aria, che facendo <lb/>forza da per tutto, volendo entrare combatte con il Mercu. </s>
  <s xml:id="echoid-s2183" xml:space="preserve"><lb/>rio, che vuole vſcire, nel tubo anguſto impedendo total.</s>
  <s xml:id="echoid-s2184" xml:space="preserve">
<pb o="67" file="00073" n="73" rhead="SECONDO."/>
mente l’vſcita, mà non nel più largo. </s>
  <s xml:id="echoid-s2185" xml:space="preserve">Anzi, che quando il fo-<lb/>rame del tubo è anguſtiſſimo, anco quando è alto li 29. </s>
  <s xml:id="echoid-s2186" xml:space="preserve">diti, <lb/>non n’eſce più in conto alcuno. </s>
  <s xml:id="echoid-s2187" xml:space="preserve">Che perciò nel _Dial_. </s>
  <s xml:id="echoid-s2188" xml:space="preserve">3. </s>
  <s xml:id="echoid-s2189" xml:space="preserve">_nu_. </s>
  <s xml:id="echoid-s2190" xml:space="preserve">7. <lb/></s>
  <s xml:id="echoid-s2191" xml:space="preserve">_del medemo Lib_. </s>
  <s xml:id="echoid-s2192" xml:space="preserve">dice, che hauendo preſo vn tubo più lungo <lb/>delli diti 29. </s>
  <s xml:id="echoid-s2193" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s2194" xml:space="preserve">empitolo di Mercurio, &amp; </s>
  <s xml:id="echoid-s2195" xml:space="preserve">otturata la ſua aper. </s>
  <s xml:id="echoid-s2196" xml:space="preserve"><lb/>tura con cera, &amp; </s>
  <s xml:id="echoid-s2197" xml:space="preserve">fattolinel mezzo vn bucchetto grande co-<lb/>me quello delli Horologi arenari, e voltatolo all’ingiù nell’ <lb/>aria libera, dice _Hydrargirum è paruulo foramineeffluere videbis_, <lb/>_perinde atque arena ex clepſydra. </s>
  <s xml:id="echoid-s2198" xml:space="preserve">Tum tamdiù motum perſeuera-_ <lb/>_re videbis, quoad cylindri vertex, vn de trigeſimum digitum exactè_ <lb/>_attigerit, quo instante ceſſabit Mercurij effluxus_.</s>
  <s xml:id="echoid-s2199" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2200" xml:space="preserve">_Conte_. </s>
  <s xml:id="echoid-s2201" xml:space="preserve">Io ſaprei volontierile cagioni di queſte differenze.</s>
  <s xml:id="echoid-s2202" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2203" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s2204" xml:space="preserve">Che quando il Mercurio del tubo eccede li diti 29. </s>
  <s xml:id="echoid-s2205" xml:space="preserve">deb-<lb/>ba vſcire in tuttili tubi ſtretti, ò larghi, ſino chearriui a quel <lb/>la miſura, emanifeſto douer ſuccedere, perche con il ſuo <lb/>momento ſupera quello dell’aria, che li contraſta, che non <lb/>può equilibrare, che li diti 29. </s>
  <s xml:id="echoid-s2206" xml:space="preserve">Ma che eſchi quando è mi-<lb/>nore delli diti 29. </s>
  <s xml:id="echoid-s2207" xml:space="preserve">ò eguale nelli tubilarghi, e non nelli ſtret-<lb/>ti, credo che prouenga dall’inegual momento, con il quale <lb/>aggrauano le parti del Mercurio, aggrauando più quelle di <lb/>mezzo, che quelli alli lati.</s>
  <s xml:id="echoid-s2208" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2209" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s2210" xml:space="preserve">Se mi para innazi a gl’occhi vna gran confuſione di me-<lb/>canica.</s>
  <s xml:id="echoid-s2211" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2212" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s2213" xml:space="preserve">Certo che queſta è mecanica, che io procurarò poner <lb/>in chiaro. </s>
  <s xml:id="echoid-s2214" xml:space="preserve">Caro Signor Ofredi leghi al mezzo di queſto ci-<lb/>lindro di ferro vn poco di ſpago, e lo tenghi con la mano <lb/>equilibrato orizontalmente, enotiilſuo peſo così conil <lb/>ſenſo.</s>
  <s xml:id="echoid-s2215" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2216" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s2217" xml:space="preserve">L’hò ſeruita, e l’hò bene in mente.</s>
  <s xml:id="echoid-s2218" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2219" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s2220" xml:space="preserve">Alzi perpendicolare in taglio ſopra queſto tauolino <lb/>quelli due gran Libri, tanto diſtanti trà ſe, che diſcendendo <lb/>il ferro, li vadiradendo, e proui ſe ſente tanto peſo quanto <lb/>ſentiua prima.</s>
  <s xml:id="echoid-s2221" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2222" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s2223" xml:space="preserve">Certo che nò, perche il peſo del ferro è in parte ſoſtenta-<lb/>to dal contatto delli libri.</s>
  <s xml:id="echoid-s2224" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2225" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s2226" xml:space="preserve">Si che il contatto del ferro con li ſuoi capi alli libri, e ca-<lb/>gione, che il ferro non eſerciti tanto momento ſentito dal-<lb/>la ſua mano, come eſercitarebbe ſe non toccaſſe. </s>
  <s xml:id="echoid-s2227" xml:space="preserve">Ma di tut-
<pb o="68" file="00074" n="74" rhead="DIALOGO"/>
to quel momento che lei ſente, e che eſercita il ferro ſopra <lb/>la ſua mano, crede che le parti del ferro lo partecipino e-<lb/>gualmente?</s>
  <s xml:id="echoid-s2228" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2229" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s2230" xml:space="preserve">Nò Sig. </s>
  <s xml:id="echoid-s2231" xml:space="preserve">perche sò beniſſimo, che prouano li Mecanici, <lb/>che s’io ficcaſi nel muro cõ vno delli ſuoi eſtremi queſto ci-<lb/>lindro, che le ſue parti hauerebbero maggior momento cõ-<lb/>forme che foſſero diſtanti dal muro; </s>
  <s xml:id="echoid-s2232" xml:space="preserve">di modo che le parti vi-<lb/>cine hauerebbero pochiſſimo momento, e le più lontane. <lb/></s>
  <s xml:id="echoid-s2233" xml:space="preserve">ſempre più; </s>
  <s xml:id="echoid-s2234" xml:space="preserve">di modo che l’eſtreme hauerebbero il maggio-<lb/>re di tutti. </s>
  <s xml:id="echoid-s2235" xml:space="preserve">E così quando il ferro foſſe fitto con li ſuoi eſtre-<lb/>mi in due muri, le parti vicine alli muri hauerebbero minor <lb/>momento, e quella di mezzo più di tutte le altre. </s>
  <s xml:id="echoid-s2236" xml:space="preserve">Quello, che <lb/>accade al ferro fitto con l’eſtremi, accade anco quando toc. </s>
  <s xml:id="echoid-s2237" xml:space="preserve"><lb/>ca, con queſta differenza, che il contatto non ſcema tanto <lb/>il momento, che il ferro eſercita, quanto lo ſcema la ſicca-<lb/>tura, ò l’appoggio.</s>
  <s xml:id="echoid-s2238" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2239" xml:space="preserve">_Conte_. </s>
  <s xml:id="echoid-s2240" xml:space="preserve">Con queſti diſcorſi hanno eccitato la mia imaginatione <lb/>a penetrar la cauſa, perche quelli, che peſano qualche coſa <lb/>con la ſtadera, procurino che il peſo non tocchi, ò le ſue ve-<lb/>ſtimenta, ò coſa alcuna; </s>
  <s xml:id="echoid-s2241" xml:space="preserve">ciò fanno, perche con quel contat-<lb/>to perde parte il peſo del ſuo momento.</s>
  <s xml:id="echoid-s2242" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2243" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s2244" xml:space="preserve">Tutto và bene. </s>
  <s xml:id="echoid-s2245" xml:space="preserve">Hora Sig. </s>
  <s xml:id="echoid-s2246" xml:space="preserve">Ofredilei ha toccato la vera <lb/>cauſa, per la quale l’aequa contenuta nel cannellino perde <lb/>parte del ſuo momento. </s>
  <s xml:id="echoid-s2247" xml:space="preserve">Queſta tocca la ſuperficie interiore <lb/>del cannellino, e perciò il contatto ſcema in parte il ſuo mo-<lb/>mento totale, che eſercitarebbe ſe non toccaſſe. </s>
  <s xml:id="echoid-s2248" xml:space="preserve">Mà di più, il <lb/>momento, ch’eſercita premendo quella, che li è ſottopoſta, <lb/>non è eſercitato egualmente da tutte le parti, mà il maſſi-<lb/>mo da quelle di mezzo, e va ſcemando più che ſono vicine <lb/>alla ſuperficie. </s>
  <s xml:id="echoid-s2249" xml:space="preserve">Il medemo m’ andauo imaginando che ſuc-<lb/>cedeſse all’aria, che riempie il cannellino, che perciò perda <lb/>parte del ſuo momento, ne grauiti come l’eſteriore. </s>
  <s xml:id="echoid-s2250" xml:space="preserve">Hora <lb/>queſt’inegual preſſione parmi eſſer cagione ch’il Mercurio <lb/>minore in altezza delli diti 29. </s>
  <s xml:id="echoid-s2251" xml:space="preserve">diſcenda nella canna aſsai lar-<lb/>ga, e non nella più ſtretta.</s>
  <s xml:id="echoid-s2252" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2253" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s2254" xml:space="preserve">O queſto nò che non lo capiſco.</s>
  <s xml:id="echoid-s2255" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2256" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s2257" xml:space="preserve">O che oſcurita, che V. </s>
  <s xml:id="echoid-s2258" xml:space="preserve">S. </s>
  <s xml:id="echoid-s2259" xml:space="preserve">non vi vede. </s>
  <s xml:id="echoid-s2260" xml:space="preserve">Senta. </s>
  <s xml:id="echoid-s2261" xml:space="preserve">Non vi è diffi-<lb/>coltà che fa forza il Mercurio per diſcendere, e fa forza l’ac-
<pb o="69" file="00075" n="75" rhead="SECONDO."/>
qua per aſcendere; </s>
  <s xml:id="echoid-s2262" xml:space="preserve">e quando queſte forze foſsero eſercita-<lb/>te egualmente da tutte le parti di queſti fluidi, crede lei che <lb/>ſi farebbe moto alcuno?</s>
  <s xml:id="echoid-s2263" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2264" xml:space="preserve">_Ofred_ Nò certo. </s>
  <s xml:id="echoid-s2265" xml:space="preserve">E riſplende tanto di lume, che io vedo beniſſi-<lb/>mo, cheſe le parti del Mercurio premeſsero col medemo <lb/>momento, che non vi ſaria ne aſceſa, ne diſceſa; </s>
  <s xml:id="echoid-s2266" xml:space="preserve">ma pre-<lb/>mendo meno quelle alli lati, che quelle del mezzo, l’aria che <lb/>dal ſuo elaterio è ſpinta all’insù vniformemente, ſuperando <lb/>la reſiſtenza di quelle, aſcende, oue troua maggior debolez. <lb/></s>
  <s xml:id="echoid-s2267" xml:space="preserve">za, cioè circa li lati, &amp; </s>
  <s xml:id="echoid-s2268" xml:space="preserve">il Mercurio diſcende nel mezzo. </s>
  <s xml:id="echoid-s2269" xml:space="preserve">E <lb/>vero però che ſi fa aſcendendo l’acqua, e deſcendendo il <lb/>Mercurio, vn bollimento, eſconuoglimento, ma però il <lb/>moto principia così. </s>
  <s xml:id="echoid-s2270" xml:space="preserve">Ma ne meno ſin’hora sò vedere, per-<lb/>che ſucceda queſto nelli tubi larghi, e non nelli ſtretti, <lb/>mentre, e in queſti, e in quelli milita la medema cauſa.</s>
  <s xml:id="echoid-s2271" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2272" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s2273" xml:space="preserve">E verò Sig. </s>
  <s xml:id="echoid-s2274" xml:space="preserve">Ofredi, che parlando per coſi dire, in rigor <lb/>Geometrico, le parti di mezzo nelli cilindri ſtretti eſercita-<lb/>no maggior momento, che le parti attaccate alli lati; </s>
  <s xml:id="echoid-s2275" xml:space="preserve">ma <lb/>però per la loro vicinità non vi è differenza ſenſibile di mo-<lb/>mento; </s>
  <s xml:id="echoid-s2276" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s2277" xml:space="preserve">in conſeguenza premono egualmente, e perciò <lb/>non ne ſegue moto alcuno.</s>
  <s xml:id="echoid-s2278" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2279" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s2280" xml:space="preserve">Queſte dottrine aſſai mi piaciono, e non poſſono eſſer <lb/>che ſingolari, mentre credo che ſiano del Sig. </s>
  <s xml:id="echoid-s2281" xml:space="preserve">Sinclaro.</s>
  <s xml:id="echoid-s2282" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2283" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s2284" xml:space="preserve">Non ſono del Signor Sinclaro, che _nel luogo citato num_. </s>
  <s xml:id="echoid-s2285" xml:space="preserve">5. <lb/></s>
  <s xml:id="echoid-s2286" xml:space="preserve">nominando, non il Mercurio, ma l’acqua che diſcende dal-<lb/>la canna, ò vaſo, nelli quali però milita la medema ragione, <lb/>ha queſte parole. </s>
  <s xml:id="echoid-s2287" xml:space="preserve">_Quoniam aquei cylindri baſis, ob nimiam ſuam_ <lb/>_amplitudinem, facilè &amp; </s>
  <s xml:id="echoid-s2288" xml:space="preserve">expeditè, ſe in modum quaſi cunei confor-_ <lb/>_mat, cuius ope, &amp; </s>
  <s xml:id="echoid-s2289" xml:space="preserve">auxilio expeditiùs aerem obſidentem penetrat:_ </s>
  <s xml:id="echoid-s2290" xml:space="preserve"><lb/>_quibus modis euenit, vt delabente aqua, per idem orificium aer ſub-_ <lb/>_intret. </s>
  <s xml:id="echoid-s2291" xml:space="preserve">Vel quod veriùs dici potest, existimo circumfuſum aerem po-_ <lb/>_tius formam cunei ſubire; </s>
  <s xml:id="echoid-s2292" xml:space="preserve">atq; </s>
  <s xml:id="echoid-s2293" xml:space="preserve">ità penetrando aquam, per eius mediis_ <lb/>_recta aſcendere, eum extrudendo; </s>
  <s xml:id="echoid-s2294" xml:space="preserve">non ſecùs ac, dum quis manu in_ <lb/>_vaſculum aqua plenum intruſa, eam extrudit_. </s>
  <s xml:id="echoid-s2295" xml:space="preserve">Io non credo che <lb/>queſta operatione ſucceda, nè nell’vno, nè nell’altro modo. </s>
  <s xml:id="echoid-s2296" xml:space="preserve"><lb/>Non credo che l’acqua in modo di cuneo penetri nell’ aria, <lb/>e così caccia queſta nel vaſo, mentre l’aria vniformemente <lb/>reſiſte ad eſser diuiſa dall’acqua; </s>
  <s xml:id="echoid-s2297" xml:space="preserve">ma che più toſto queſta
<pb o="70" file="00076" n="76" rhead="DIALOGO"/>
ſuperando le parti meno reſiſtenti dell’acqua, ſpinga @uo@ <lb/>per così dire, le parti di mezzo, ò per meglio dire faciliti la <lb/>loro diſceſa. </s>
  <s xml:id="echoid-s2298" xml:space="preserve">Molto meno credo, che l’aria ſi conformi in <lb/>cuneo per penetrare nelle parti di mezzo l’acqua, perche <lb/>non tengo per coſi balorda la natura, come ſarebbe ſe cos@ <lb/>operaſse.</s>
  <s xml:id="echoid-s2299" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2300" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s2301" xml:space="preserve">Come balorda? </s>
  <s xml:id="echoid-s2302" xml:space="preserve">La figura del cuneo non è penetratiua? <lb/></s>
  <s xml:id="echoid-s2303" xml:space="preserve">Non l’adoprano ſino li taglia legne?</s>
  <s xml:id="echoid-s2304" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2305" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s2306" xml:space="preserve">Bene, bene. </s>
  <s xml:id="echoid-s2307" xml:space="preserve">Non ſarebbe vn balordo, chi potendo otte-<lb/>nere il ſuo intento per vna via più facile, andaſſe a cercare la <lb/>più difficile?</s>
  <s xml:id="echoid-s2308" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2309" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s2310" xml:space="preserve">Vi è l’aſſioma vecchio, fracido, che _fruſtra fit per plura, quo@_ <lb/>_potest fi eri per pauciora_.</s>
  <s xml:id="echoid-s2311" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2312" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s2313" xml:space="preserve">Mò contro queſt’aſſioma appunto farebbe la natura in <lb/>queſto caſo. </s>
  <s xml:id="echoid-s2314" xml:space="preserve">Già l’acqua ha maggior momento nel mezzo <lb/>per diſcendere, e minore alli lati; </s>
  <s xml:id="echoid-s2315" xml:space="preserve">e vuole V. </s>
  <s xml:id="echoid-s2316" xml:space="preserve">S. </s>
  <s xml:id="echoid-s2317" xml:space="preserve">che l’aria ab-<lb/>bandonando queſti, oue ritroua minor reſiſtenza, vada a dar <lb/>di petto in forma di cuneo alle parti di mezzo?</s>
  <s xml:id="echoid-s2318" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2319" xml:space="preserve">_Conte_. </s>
  <s xml:id="echoid-s2320" xml:space="preserve">Così anco ſi vede che aſcende l’acqua nelli ſopradetti <lb/>cannellini aperti, principiando la ſalita alle parti, e non nel <lb/>mezzo.</s>
  <s xml:id="echoid-s2321" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2322" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s2323" xml:space="preserve">E come lo sà V S?</s>
  <s xml:id="echoid-s2324" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2325" xml:space="preserve">_Conte_. </s>
  <s xml:id="echoid-s2326" xml:space="preserve">Perche l’acqua non aſcende ſe il cannellino non è ben <lb/>terſo, e pulito, ò bagnato, e non s’è ſuccido. </s>
  <s xml:id="echoid-s2327" xml:space="preserve">Il che non ſegui-<lb/>rebbe quando aſcendeſſe nel mezzo in forma di cuneo.</s>
  <s xml:id="echoid-s2328" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2329" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s2330" xml:space="preserve">Io ancora non penetro la ragione di queſto.</s>
  <s xml:id="echoid-s2331" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2332" xml:space="preserve">_Conte_. </s>
  <s xml:id="echoid-s2333" xml:space="preserve">Il ſuccidume non è altro che vn’infinità di corpuſcoli at-<lb/>taccati alli lati a guiſa di monticelli, ò ſcoglietti, nelli quali <lb/>vrtando l’acqua viene impedita dall’aſcendere. </s>
  <s xml:id="echoid-s2334" xml:space="preserve">Ma quando <lb/>la ſuperficie è bagnata, le particelle dell’acqua riempiono <lb/>quelle infinite cauità, che ſono trà ſcoglietto, e ſcoglietto, e <lb/>così ſpianano la ſtrada allla ſalita.</s>
  <s xml:id="echoid-s2335" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2336" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s2337" xml:space="preserve">Se queſti monticelli foſſero cagione di queſto impedi. <lb/></s>
  <s xml:id="echoid-s2338" xml:space="preserve">mento, impedirebbero tanto nelli cannelli ſtretti, quanto <lb/>nelli più larghi. </s>
  <s xml:id="echoid-s2339" xml:space="preserve">Ma in queſti non impediſcono, come dice <lb/>hauer oſſeruato il P. </s>
  <s xml:id="echoid-s2340" xml:space="preserve">Fabri _nel citato Dial_. </s>
  <s xml:id="echoid-s2341" xml:space="preserve">4. </s>
  <s xml:id="echoid-s2342" xml:space="preserve">_pag_. </s>
  <s xml:id="echoid-s2343" xml:space="preserve">159. </s>
  <s xml:id="echoid-s2344" xml:space="preserve">Adunque <lb/>l’impedimento naſce da altro, cioè dalla maggior, ò minor <lb/>quantità d’acqua, come dice egli.</s>
  <s xml:id="echoid-s2345" xml:space="preserve"/>
</p>
<pb o="71" file="00077" n="77" rhead="SECONDO."/>
<p>
  <s xml:id="echoid-s2346" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s2347" xml:space="preserve">Li medemi monticelli, ò ſcoglietti di ſuccidume non <lb/>arrecaranno il medemo impedimento alli cannelli larghi, <lb/>che arrecaranno alli più ſtretti. </s>
  <s xml:id="echoid-s2348" xml:space="preserve">V. </s>
  <s xml:id="echoid-s2349" xml:space="preserve">S. </s>
  <s xml:id="echoid-s2350" xml:space="preserve">prenda vna circonferen-<lb/>za aſſai grande, e riempita la parte caua di conetti, ò pira-<lb/>midi, attaccando le ſue baſi ad eſſa, di modo che vna pira-<lb/>mide tocchi l’altra. </s>
  <s xml:id="echoid-s2351" xml:space="preserve">Vederà che le cime delle piramidi ſaran. <lb/></s>
  <s xml:id="echoid-s2352" xml:space="preserve">no più lontane, vna dall’altra, e trà le ſuperficie d’vna, e dell’-<lb/>altra vi ſarà più ſpacio, quanto più la circonferenza ſarà <lb/>di maggior diametro. </s>
  <s xml:id="echoid-s2353" xml:space="preserve">Di modo che ſe il circolo ſarà piccio-<lb/>liſſimo, li lati delle piramidiſaranno viciniſſimi, e le cime, ò <lb/>vertici quaſi concorreranno in vn punto.</s>
  <s xml:id="echoid-s2354" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2355" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s2356" xml:space="preserve">Hò inteſo. </s>
  <s xml:id="echoid-s2357" xml:space="preserve">Nelli cannelli più larghi, perche li lati delle <lb/>piramidi, e li ſuoi vertici ſono più diſtanti, più facilmente l’-<lb/>acqua può ſuperare l’impedimento delli ſcoglietti del ſucci-<lb/>dume, aſcendendo per li ſpacii, che ſono trà ſcoglio, e ſco-<lb/>glio. </s>
  <s xml:id="echoid-s2358" xml:space="preserve">Il che più difficilmente ſuccede nelli più piccioli, per li <lb/>anguſti ſpacii, che ſono trà l’vno, e l’altro ſcoglietto.</s>
  <s xml:id="echoid-s2359" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2360" xml:space="preserve">_Mà_ miei Signori molto habbiamo digredito. </s>
  <s xml:id="echoid-s2361" xml:space="preserve">E già tempo che <lb/>ritorniamo alla cagione dell’aſcender dell’ acqua nelli can-<lb/>nellini. </s>
  <s xml:id="echoid-s2362" xml:space="preserve">Realmente la diuerſa preſſione mi pare che tanto ag-<lb/>giuſtatamẽte accomodaſſe queſta facenda che nulla più. </s>
  <s xml:id="echoid-s2363" xml:space="preserve">Ne <lb/>l’eſpèrienze fatte a Firenze mi paiono tali, che habbino to-<lb/>talmante a rimuouermida queſto penſamento Io noncredo <lb/>che in queſte loro eſperienze habbino totalmente rimoſſa l’ <lb/>aria, ma bene debilitatala &amp; </s>
  <s xml:id="echoid-s2364" xml:space="preserve">eſtenuatala. </s>
  <s xml:id="echoid-s2365" xml:space="preserve">Nel qual caſo pro-<lb/>portionatamente debilitata, e l’ambiente il cannellino, e <lb/>quella, che li preme ſopra, non sò vedere, perche l’acqua <lb/>non doueſſe eſſer premuta a ſalire, mentre tanto, e tanto re-<lb/>ſta minore il momento di quella, che riempie, e ſouraſta al <lb/>cannellino.</s>
  <s xml:id="echoid-s2366" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2367" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s2368" xml:space="preserve">Ma Signor Ofredi il negotio ſtà, che dicono, che ſaliua <lb/>alla medema altezza. </s>
  <s xml:id="echoid-s2369" xml:space="preserve">Il che certo non douerebbe ſuccedere, <lb/>quando ſaliſce per la preſſione, come io breuemente li mo-<lb/>ſtrarò dal ſeguente</s>
</p>
<pb o="72" file="00078" n="78" rhead="DIALOGO"/>
</div>
<div xml:id="echoid-div18" type="section" level="1" n="11">
<head xml:id="echoid-head10" xml:space="preserve">LEMMA.</head>
<p style="it">
  <s xml:id="echoid-s2370" xml:space="preserve">Siano AB, CD, magnitudini egua-<lb/>
<anchor type="figure" xlink:label="fig-00078-01a" xlink:href="fig-00078-01"/>
li, e da C D, ſia leuata D E, e <lb/>come A B, alla C E, coſi ſia <lb/>A F, alla C G, ſarà D G, maggio-<lb/>re della B F:</s>
  <s xml:id="echoid-s2371" xml:space="preserve"/>
</p>
<div xml:id="echoid-div18" type="float" level="2" n="1">
  <figure xlink:label="fig-00078-01" xlink:href="fig-00078-01a">
    <image file="00078-01" xlink:href="http://echo.mpiwg-berlin.mpg.de/zogilib?fn=/permanent/library/9EXVCG1R/figures/00078-01"/>
  </figure>
</div>
<p>
  <s xml:id="echoid-s2372" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s2373" xml:space="preserve">Capiſco queſta verità in vn’iſtante. </s>
  <s xml:id="echoid-s2374" xml:space="preserve">Perche eſſendo co-<lb/>me A B, a C E, coſi A F, a C G, &amp; </s>
  <s xml:id="echoid-s2375" xml:space="preserve">eſſendo A B, maggiore della <lb/>C E, ſarà anco A F, maggiore della C G; </s>
  <s xml:id="echoid-s2376" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s2377" xml:space="preserve">in conſeguenza <lb/>eſſendo A B, C D, eguali, ſarà G D, maggior della B F. </s>
  <s xml:id="echoid-s2378" xml:space="preserve">Il punto <lb/>ſtà a moſtrar il reſto.</s>
  <s xml:id="echoid-s2379" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2380" xml:space="preserve">_Mat._ </s>
  <s xml:id="echoid-s2381" xml:space="preserve">Già _Fama volat_ della ſua peritia, nella Geometria; </s>
  <s xml:id="echoid-s2382" xml:space="preserve">e ſe ap-<lb/>plicarà queſta verità aſtratta al concreto, vederà anco il re-<lb/>ſto. </s>
  <s xml:id="echoid-s2383" xml:space="preserve">A B, rapreſenta il momento, che ha l’aria a mbiente il <lb/>cannellino innanzi la ſua eſtenuatione; </s>
  <s xml:id="echoid-s2384" xml:space="preserve">C E rappreſenta il <lb/>momento dell’aria ſopraſtante, e del cãnellino; </s>
  <s xml:id="echoid-s2385" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s2386" xml:space="preserve">E D, quello <lb/>della ſua acqua; </s>
  <s xml:id="echoid-s2387" xml:space="preserve">li quali momenti di A B, C D, ſono eguali, per <lb/>farſi l’quilibrio. </s>
  <s xml:id="echoid-s2388" xml:space="preserve">Eſtenuata l’aria, e ſcemato il momento, ſia <lb/>il ſcemamento del momento A B, l’A F e del momento C E, <lb/>la C G, li quali già hanno la proportione delli momenti A B, <lb/>C E, è reftaranno dell’aria eſtenuata li momenti F B, G E. </s>
  <s xml:id="echoid-s2389" xml:space="preserve">E co-<lb/>sì rimarà il momento G D, dell’aria ſopra il cannellino, e <lb/>acqua ſalita, maggiore del momento F B. </s>
  <s xml:id="echoid-s2390" xml:space="preserve">Onde, ò l’acqua <lb/>douerebbe diſcendere, ſe foſſe aſceſa, ò non aſcendere ſino <lb/>a quell’ altezza.</s>
  <s xml:id="echoid-s2391" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2392" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s2393" xml:space="preserve">Che ſe hà adunque a dire?</s>
  <s xml:id="echoid-s2394" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2395" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s2396" xml:space="preserve">Io ſono pieno di confuſioni, ne ſaprei che dirmi per hora. <lb/></s>
  <s xml:id="echoid-s2397" xml:space="preserve">Tanto più che in altra belliſſima eſperienza pure del Sig. </s>
  <s xml:id="echoid-s2398" xml:space="preserve">Ri-<lb/>naldini, non s’eſperimenta ſalita, ſe non vi è l’aria pre-<lb/>mente.</s>
  <s xml:id="echoid-s2399" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2400" xml:space="preserve">_Conte_. </s>
  <s xml:id="echoid-s2401" xml:space="preserve">Intendo; </s>
  <s xml:id="echoid-s2402" xml:space="preserve">anco queſta è regiſtrata dal Giornaliere di Ve-<lb/>netia ſotto il 1. </s>
  <s xml:id="echoid-s2403" xml:space="preserve">Maggio 1671.</s>
  <s xml:id="echoid-s2404" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2405" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s2406" xml:space="preserve">E anco poſta _nel ſuo Lib. </s>
  <s xml:id="echoid-s2407" xml:space="preserve">de Comp. </s>
  <s xml:id="echoid-s2408" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s2409" xml:space="preserve">Reſol. </s>
  <s xml:id="echoid-s2410" xml:space="preserve">Mathem. </s>
  <s xml:id="echoid-s2411" xml:space="preserve">pag_. </s>
  <s xml:id="echoid-s2412" xml:space="preserve">158. <lb/></s>
  <s xml:id="echoid-s2413" xml:space="preserve">Preſe egli due cilindretti di ſtagno groſſi quanto vna pen-<lb/>na da ſcriuere, e lunghi vn quarto di braccio Fiorentino, ad <lb/>vna delle baſi delli quali fece incaſtrare laminette, ò circoli
<pb o="73" file="00079" n="79" rhead="SECONDO."/>
ſottili d’oro fino de diametro e-<lb/>
<anchor type="figure" xlink:label="fig-00079-01a" xlink:href="fig-00079-01"/>
guale a quello delle baſi. </s>
  <s xml:id="echoid-s2414" xml:space="preserve">Immer-<lb/>ſe il capo ſenza oro d’vno di que <lb/>ſti nell’argento viuo d’vn vaſo, <lb/>e notò la parte immerſa, come <lb/>anco l’eſtãte. </s>
  <s xml:id="echoid-s2415" xml:space="preserve">A queſta notata la <lb/>parte eguale nell’altro dalla par-<lb/>te dell’oro, la inuolſe totalmente <lb/>con vn naſtro di veſica ligato <lb/>ſtrettamente con filo. </s>
  <s xml:id="echoid-s2416" xml:space="preserve">Fatto ciò <lb/>preſe il cannello di vetro F A, a-<lb/>perto d’ambi le parti, e ſerata la <lb/>parte A, con veſica, lo riempì <lb/>per la parte F, d’argento viuo, <lb/>dentro à queſto cacciò per forza <lb/>il cilindretto veſtito, con la parte <lb/>nuda auanti, come ſi vede nella <lb/>figura, e ligò la bocca F, con ve-<lb/>ſica ſtrettamente. </s>
  <s xml:id="echoid-s2417" xml:space="preserve">Poi immerſe la <lb/>parte A, nel vaſo contenente <lb/>il Mercurio ſtagnante, e così im-<lb/>merſa forò la veſica A, con vn <lb/>ago. </s>
  <s xml:id="echoid-s2418" xml:space="preserve">Il che fatto, calò il Mercu-<lb/>rio della canna alla ſolita altez-<lb/>za C B, entro al quale era immer-<lb/>fa la C K, parte nuda del cilin-<lb/>dretto veſtito. </s>
  <s xml:id="echoid-s2419" xml:space="preserve">In queſta guiſa <lb/>laſciò ogni coſa per lo ſpacio de <lb/>24. </s>
  <s xml:id="echoid-s2420" xml:space="preserve">hore. </s>
  <s xml:id="echoid-s2421" xml:space="preserve">In capo alle quali, ri-<lb/>trouò il cilindretto eſpoſto all’-<lb/>aria nel primo vaſo, con la parte <lb/>immerſa entro l’argento viuo <lb/>corroſa in gran parte, e quella <lb/>non corroſa era totalmente fria-<lb/>bile. </s>
  <s xml:id="echoid-s2422" xml:space="preserve">La parte poi eſtante ſopra <lb/>il Mercurio era tutta pregna d’argento viuo, e totalmente <lb/>friabile; </s>
  <s xml:id="echoid-s2423" xml:space="preserve">e I’oro incaſtrato di ſopra haueua grandemente mu-<lb/>tato colore. </s>
  <s xml:id="echoid-s2424" xml:space="preserve">Del cilindretto poi contenuto entro la canna,
<pb o="74" file="00080" n="80" rhead="DIALOGO"/>
trouò la parte nuda immerſa nell’ argento aſſai corroſa, con <lb/>il rimanente molto friabile; </s>
  <s xml:id="echoid-s2425" xml:space="preserve">ma la parte eſtante (già veſtita à <lb/>ſolo oggetto, che ſommerſa totalmente nell’argento della <lb/>canna prima di procurar il vuoto, non riceueſse da eſſo alte-<lb/>ratione) la ritrouò di ſtagno puro ſenza alcuna permiſtio-<lb/>ne di Mercurio, e l’oro non punto mutato di colore.</s>
  <s xml:id="echoid-s2426" xml:space="preserve"/>
</p>
<div xml:id="echoid-div19" type="float" level="2" n="2">
  <figure xlink:label="fig-00079-01" xlink:href="fig-00079-01a">
    <image file="00079-01" xlink:href="http://echo.mpiwg-berlin.mpg.de/zogilib?fn=/permanent/library/9EXVCG1R/figures/00079-01"/>
  </figure>
</div>
<p>
  <s xml:id="echoid-s2427" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s2428" xml:space="preserve">Certo chel’eſperienza è belliſſima. </s>
  <s xml:id="echoid-s2429" xml:space="preserve">Ma coſa ſe ne caua da <lb/>eſſa?</s>
  <s xml:id="echoid-s2430" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2431" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s2432" xml:space="preserve">Se ne caua, che eſſendo il Mercurio del primo vaſo eſpo-<lb/>ſto all’aria con il cilindretto, ’l’aria premete ſopra il Mercu-<lb/>rio, e lo ſpinſe per li pori del ſtagno ad infettarlo. </s>
  <s xml:id="echoid-s2433" xml:space="preserve">Al con-<lb/>trario, non premendo aria ſopra il Mercurio contenuto en-<lb/>tro la canna, per non vi eſſer, per cagione del vuoto, ò alme-<lb/>no eſſendo deboliſſima, non potè il Mercurio eſſer ſpinto <lb/>all’in sù a penetrare per li Pori. </s>
  <s xml:id="echoid-s2434" xml:space="preserve">Come vede adunque Signor <lb/>Ofredi, nel vuoto il contatto non cagiona la ſalita del Mer-<lb/>curio ſenza aria premente, ma bene cagiona la ſalita dell’-<lb/>acqua per li cannellini. </s>
  <s xml:id="echoid-s2435" xml:space="preserve">Horsù rimettiamo queſto negotio <lb/>ad altro tempo, e per hora diciamo, che la preſſione dell’aria <lb/>cagiona bene molti, e molti effetti, ma non già tutti quelli, <lb/>che gli ſono attribuiti. </s>
  <s xml:id="echoid-s2436" xml:space="preserve">Vno di queſti è quello, che regiſtra il <lb/>Sig. </s>
  <s xml:id="echoid-s2437" xml:space="preserve">Sinclaro _Lib._ </s>
  <s xml:id="echoid-s2438" xml:space="preserve">1 _Dial_. </s>
  <s xml:id="echoid-s2439" xml:space="preserve">6. </s>
  <s xml:id="echoid-s2440" xml:space="preserve">_n_. </s>
  <s xml:id="echoid-s2441" xml:space="preserve">2. </s>
  <s xml:id="echoid-s2442" xml:space="preserve">oue dice, che eſſendoli ſtato ri-<lb/>ferto, ch’eſſendo nel tubo predetto l’argento viuo equili-<lb/>brato alla natural’altezza (la quale ſecondo lui è 29. </s>
  <s xml:id="echoid-s2443" xml:space="preserve">diti del-<lb/>la ſua miſura) ſe ſi alzaſſe perpendicolarmente con preſtez-<lb/>za, e ſi ſeparaſſe dall’argento viuo contenuto nel vaſo, che <lb/>l’argento viuo ch’è nella fiſtola, ò tubo ſalirebbe con tanta <lb/>veemenza per il vacuo della canna, che romperebbe la <lb/>parte ſuperiore ſigillata, &amp; </s>
  <s xml:id="echoid-s2444" xml:space="preserve">otturata alla lucerna, ò <lb/>hermeticamente; </s>
  <s xml:id="echoid-s2445" xml:space="preserve">volſe farne l’eſperienza, e che ritrouò, che <lb/>alzandoſi così con preſtezza, era vero che ſaliua vrtando <lb/>nella cima; </s>
  <s xml:id="echoid-s2446" xml:space="preserve">ma poi mai non occorſe, che ſpezzaſſe la canna; <lb/></s>
  <s xml:id="echoid-s2447" xml:space="preserve">e che alzandola pian piano, non ſaliua in conto alcuno.</s>
  <s xml:id="echoid-s2448" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2449" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s2450" xml:space="preserve">Fenomeno veramente conſiderabile: </s>
  <s xml:id="echoid-s2451" xml:space="preserve">e che cauſa ne aſ-<lb/>ſegna egli?</s>
  <s xml:id="echoid-s2452" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2453" xml:space="preserve">_Matem_. </s>
  <s xml:id="echoid-s2454" xml:space="preserve">Sig. </s>
  <s xml:id="echoid-s2455" xml:space="preserve">Conte legga in gratia _il n._ </s>
  <s xml:id="echoid-s2456" xml:space="preserve">3. </s>
  <s xml:id="echoid-s2457" xml:space="preserve">ch’egli chiama ſettione <lb/>di queſto Libro.</s>
  <s xml:id="echoid-s2458" xml:space="preserve"/>
</p>
<p style="it">
  <s xml:id="echoid-s2459" xml:space="preserve">Conte. </s>
  <s xml:id="echoid-s2460" xml:space="preserve">_La ſeruo._ </s>
  <s xml:id="echoid-s2461" xml:space="preserve">Primi Phænomeni cauſam &amp; </s>
  <s xml:id="echoid-s2462" xml:space="preserve">rationem, opinor
<pb o="75" file="00081" n="81" rhead="SECONDO."/>
eſſe vim, &amp; </s>
  <s xml:id="echoid-s2463" xml:space="preserve">elaterium aeris, qui apertum tubi orificium ſubintrans, <lb/>Hydrargirum impendentem, ſurſum uerſus pellit. </s>
  <s xml:id="echoid-s2464" xml:space="preserve">Nam quo @inſtan-<lb/>te, celeriuſculè tubi orificium ex stagnante Hydrargiro educitur, ex-<lb/>tans Mercurius vna cum tubo alleuatur, non totus; </s>
  <s xml:id="echoid-s2465" xml:space="preserve">nam porciunculæ <lb/>quædam in inferius vaſculum delabuntur: </s>
  <s xml:id="echoid-s2466" xml:space="preserve">vnde tubi orificio plenè ex-<lb/>tra ſuperficiem alleuato, incumbens aer, quaſi perſentiſcens impen-<lb/>dentem Mercurium, aliquid de ſua grauitate deperdidiſſe, &amp; </s>
  <s xml:id="echoid-s2467" xml:space="preserve">iam <lb/>ſolito leuiorem, ſtatim orificium irrumpit, Mercuriumq; </s>
  <s xml:id="echoid-s2468" xml:space="preserve">non abſque <lb/>impetu ad tubi verticem propellit. </s>
  <s xml:id="echoid-s2469" xml:space="preserve">Secundi Phænomeni cauſa, &amp; </s>
  <s xml:id="echoid-s2470" xml:space="preserve">ra-<lb/>tio videtur bæc: </s>
  <s xml:id="echoid-s2471" xml:space="preserve">quoniam dum leniter, lentoque gradu tubi orificium, <lb/>è refuſo Mercurio in apertum aerem ſuſtollo, nihil omnino impẽdentis <lb/>Hydrargiri, in inferius vaſculum delabitur;</s>
  <s xml:id="echoid-s2472" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2473" xml:space="preserve">_Matem._ </s>
  <s xml:id="echoid-s2474" xml:space="preserve">Si fermi caro Sig. </s>
  <s xml:id="echoid-s2475" xml:space="preserve">Conte, che poi ſeguitarà. </s>
  <s xml:id="echoid-s2476" xml:space="preserve">Io dubito <lb/>grandemente di queſte ſuppoſitioni, che in pratica non ſe-<lb/>gua tutto il contrario, cioè che non ſolo nell’alzamento ve-<lb/>loce nulla dell’argento viuo della fiſtola cada nel vaſo, ma <lb/>che più toſto di quello dal vaſo ſegua quello della fiſtola. </s>
  <s xml:id="echoid-s2477" xml:space="preserve">Al <lb/>contrario nell’alzamento fatto pian piano, che almeno ſe <lb/>non cade di quello della fiſtola nel vaſo, certo di quello del <lb/>vaſo non ſegua quello della fiſtola. </s>
  <s xml:id="echoid-s2478" xml:space="preserve">E la ragione è, perche <lb/>nella preſta trattione, nella quale ſi debba farela ſeparatione <lb/>di due corpi, vno ſegue l’altro; </s>
  <s xml:id="echoid-s2479" xml:space="preserve">ilche nõ ſi fà nella trattione <lb/>lenta. </s>
  <s xml:id="echoid-s2480" xml:space="preserve">Sc vn quadrello ſarà ſopra vn’altro, ſe con preſtezza <lb/>alzerò il ſuperiore, l’inferiore lo ſeguirà per qualche poco; <lb/></s>
  <s xml:id="echoid-s2481" xml:space="preserve">il che non ſuccede ſe alzarò pian piano. </s>
  <s xml:id="echoid-s2482" xml:space="preserve">Così ſe vn galleg-<lb/>giante ſi vorrà cauar dall’acqua con preſtezza, ſi vedrà non <lb/>poco alzamento di queſta, il quale non riuſcirà così grande <lb/>nella cauata piaceuole. </s>
  <s xml:id="echoid-s2483" xml:space="preserve">Mà queſti miei dubii ſiano come <lb/>non detti. </s>
  <s xml:id="echoid-s2484" xml:space="preserve">Concediamo pur anco al Signor Sinclaro, che ſia <lb/>vero quanto dice; </s>
  <s xml:id="echoid-s2485" xml:space="preserve">vediamo pure il rimanente della cauſa <lb/>della diſparità, ch’aſſegna.</s>
  <s xml:id="echoid-s2486" xml:space="preserve"/>
</p>
<p style="it">
  <s xml:id="echoid-s2487" xml:space="preserve">Conte. </s>
  <s xml:id="echoid-s2488" xml:space="preserve">Sed integer cylindrus, iuſtum renitentis aeris æquipodivm ſimul <lb/>cum tubo alleuatur: </s>
  <s xml:id="echoid-s2489" xml:space="preserve">vndè quaſi perſentiſcens ille, impendentem Hy-<lb/>drargirum nihil de ſua grauitate amiſiſſe, &amp; </s>
  <s xml:id="echoid-s2490" xml:space="preserve">ſibi etiam viribus pa-<lb/>rem permanere, illum ſuo loco pellere nequit.</s>
  <s xml:id="echoid-s2491" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2492" xml:space="preserve">_Matem._ </s>
  <s xml:id="echoid-s2493" xml:space="preserve">Io non mi poſſo perſuadere in conto a lcuno, che queſt’-<lb/>effetto prouenga dalla ſola grauità, &amp; </s>
  <s xml:id="echoid-s2494" xml:space="preserve">elaterio dell’aria; </s>
  <s xml:id="echoid-s2495" xml:space="preserve">per-<lb/>che già la grauità dell’aria eſercita tutto il ſuo momento, il
<pb o="76" file="00082" n="82" rhead="DIALOGO"/>
quale viene contrapeſato, e ridotto all’equilibrio dal momẽ. <lb/></s>
  <s xml:id="echoid-s2496" xml:space="preserve">to dell’argento viuo contenuto nella canna. </s>
  <s xml:id="echoid-s2497" xml:space="preserve">Quando queſta <lb/>s’alza, ſe bene cadeſsero da eſsa quelle portioncelle, che di-<lb/>ce, onde ſi leuaſfe quell’equilibrio, la differenza però trà <lb/>queſti due momenti ſarebbe pochiſſima. </s>
  <s xml:id="echoid-s2498" xml:space="preserve">Onde non caccian-<lb/>do in sù l’aria l’argento viuo ſe non cõ l’ecceſſo del ſuo mo-<lb/>mento ſopra quello, non ſpingerebbe in sù con la violenza <lb/>narrata da eſſo, ma lentamente. </s>
  <s xml:id="echoid-s2499" xml:space="preserve">Così vediamo che il galleg-<lb/>giante poco differente in peſo dall’acqua, e cacciato in sù da <lb/>queſta aſſai lentamente. </s>
  <s xml:id="echoid-s2500" xml:space="preserve">Coſi nella Bilancia,</s>
</p>
<p style="it">
  <s xml:id="echoid-s2501" xml:space="preserve">Conte. </s>
  <s xml:id="echoid-s2502" xml:space="preserve">_Si fermi in gratia. </s>
  <s xml:id="echoid-s2503" xml:space="preserve">Segue à dire._ </s>
  <s xml:id="echoid-s2504" xml:space="preserve">Quemadmodum corpus gra-<lb/>ue huic lanci impoſitum, aliud graue eiusdem ponderis alteri lanci <lb/>impoſitum, finitis vibrationibus, à iuſto æquipodio nequit dimouere. <lb/></s>
  <s xml:id="echoid-s2505" xml:space="preserve">Sin, ijs in æquilibrio ſic conſtitutis, huic lanci vnum duntaxat gra-<lb/>num, plus quam alteri imponas, fit mutatio; </s>
  <s xml:id="echoid-s2506" xml:space="preserve">vnà alterum in contra-<lb/>rium renitentem degrauante. </s>
  <s xml:id="echoid-s2507" xml:space="preserve">Vel ſi alteri, vnum ſolummodo granum <lb/>ſubducas, hoc idem euenire conſpicaberis.</s>
  <s xml:id="echoid-s2508" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2509" xml:space="preserve">_Mat._ </s>
  <s xml:id="echoid-s2510" xml:space="preserve">Appunto io voleuo portare il caſo della biìancia, e dire, che <lb/>ſe nelli peſi poſti di quà, e di là vi ſarà poca differenza, è vero <lb/>che quello più graue deſcenderà, &amp; </s>
  <s xml:id="echoid-s2511" xml:space="preserve">alzerà il meno graue, mà <lb/>ſino ad vn certo ſegno, e aſſai lentamente. </s>
  <s xml:id="echoid-s2512" xml:space="preserve">Onde tanto do-<lb/>uerebbe far l’aria nel noſtro caſo, e non con l’empito da eſſo <lb/>eſperimentato.</s>
  <s xml:id="echoid-s2513" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2514" xml:space="preserve">_Conte._ </s>
  <s xml:id="echoid-s2515" xml:space="preserve">Non è tanto poca la quantità dell’argento, che ſuppone, <lb/>che cada. </s>
  <s xml:id="echoid-s2516" xml:space="preserve">V.</s>
  <s xml:id="echoid-s2517" xml:space="preserve">S. </s>
  <s xml:id="echoid-s2518" xml:space="preserve">aſcolti. </s>
  <s xml:id="echoid-s2519" xml:space="preserve">_Eodem prorſus modo res hic ſe habet; </s>
  <s xml:id="echoid-s2520" xml:space="preserve">nam_ <lb/>_tubi orificio extra ſtagnantem hydrargirum de repente ſublato; </s>
  <s xml:id="echoid-s2521" xml:space="preserve">deci-_ <lb/>_dunt forte ex eo, tres quatuorue impendentis Mercurij digitis._</s>
  <s xml:id="echoid-s2522" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2523" xml:space="preserve">_Matem._ </s>
  <s xml:id="echoid-s2524" xml:space="preserve">Ha fatto bene a dir _forte,_ perche Dio sà ſe ne cade.</s>
  <s xml:id="echoid-s2525" xml:space="preserve"/>
</p>
<p style="it">
  <s xml:id="echoid-s2526" xml:space="preserve">Conte. </s>
  <s xml:id="echoid-s2527" xml:space="preserve">Ratione cuius, ex altera, quaſilance, æquipodij non nihil aufer-<lb/>tur; </s>
  <s xml:id="echoid-s2528" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s2529" xml:space="preserve">hinc exiſtit ille aeris motus, quo impendentis Hydrargiri reſi-<lb/>duum ad tubi verticem ſurſum propellitur; </s>
  <s xml:id="echoid-s2530" xml:space="preserve">non ſecùs atq; </s>
  <s xml:id="echoid-s2531" xml:space="preserve">hæc lanx, <lb/>cui ſex imponuntur vnciæ, ſurſum pellit illam, eamque degrauat, cui <lb/>quinque ſolummodo inſunt.</s>
  <s xml:id="echoid-s2532" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2533" xml:space="preserve">_Matem._ </s>
  <s xml:id="echoid-s2534" xml:space="preserve">Certo, che quando anco cadeſſero queſti 3. </s>
  <s xml:id="echoid-s2535" xml:space="preserve">ouero 4. </s>
  <s xml:id="echoid-s2536" xml:space="preserve">di-<lb/>ti, ne ſeguirebbe qualche moto, mà non sò ſe tanto veloce. <lb/></s>
  <s xml:id="echoid-s2537" xml:space="preserve">Hauerà il Sig. </s>
  <s xml:id="echoid-s2538" xml:space="preserve">Sinclaro eſperimentato (come certo anco di-<lb/>ce) che mentre la fiſtola piena di Mercurio diſcende, queſto <lb/>arriuato all’altezza delli 29. </s>
  <s xml:id="echoid-s2539" xml:space="preserve">ſuoi diti, non ſi ferma, ma di-
<pb o="77" file="00083" n="83" rhead="SECONDO."/>
ſcende più, e poi riſaliſce più, e più volte ſino che ſi riduce <lb/>all’equilibrio. </s>
  <s xml:id="echoid-s2540" xml:space="preserve">Hora quando diſcende ſotto li 29 diti, certo <lb/>che diſcende aſſai notabilmente; </s>
  <s xml:id="echoid-s2541" xml:space="preserve">all’hora è riſpinto in sù dal <lb/>maggior peſo dell’aria; </s>
  <s xml:id="echoid-s2542" xml:space="preserve">e pur non vediamo queſte meraui-<lb/>glie di aſcendere ſino ad vrtare nella cima della canna, &amp;</s>
  <s xml:id="echoid-s2543" xml:space="preserve">c. <lb/></s>
  <s xml:id="echoid-s2544" xml:space="preserve">Ma che, che ſi ſia, io ſono ſicuriſſimo, che anco quãdo ſiano <lb/>vere tutte le ſuppoſitioni del Sig. </s>
  <s xml:id="echoid-s2545" xml:space="preserve">Sinclaro, non però queſta <lb/>preſſione dell’aria può eſser la total cagione di queſt’ effet-<lb/>to, mentre certiſſimo v’interuengono dell’ altre cauſe.</s>
  <s xml:id="echoid-s2546" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2547" xml:space="preserve">_Ofred._ </s>
  <s xml:id="echoid-s2548" xml:space="preserve">In gratia V.</s>
  <s xml:id="echoid-s2549" xml:space="preserve">S. </s>
  <s xml:id="echoid-s2550" xml:space="preserve">l’aſſegni.</s>
  <s xml:id="echoid-s2551" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2552" xml:space="preserve">_Matem._ </s>
  <s xml:id="echoid-s2553" xml:space="preserve">Le dirò Sig. </s>
  <s xml:id="echoid-s2554" xml:space="preserve">Ofredi. </s>
  <s xml:id="echoid-s2555" xml:space="preserve">Quando io leſſi queſte coſe del Sig. <lb/></s>
  <s xml:id="echoid-s2556" xml:space="preserve">Sinclaro, preſi vn cannoncino otturato da vna parte, e dall’-<lb/>altra aperto, e li poſi dentro vna balletta, e chiudendo l’altra <lb/>parte con il dito, alzauo ogni coſa con impeto. </s>
  <s xml:id="echoid-s2557" xml:space="preserve">Sentiuo ma-<lb/>nifeſtamente, che ceſſato l’alzamento la balla ſeguiua a ſali-<lb/>re per la canna per qualche ſpacio: </s>
  <s xml:id="echoid-s2558" xml:space="preserve">e ſe io nel ſine dell’al za-<lb/>mento abbaſſauo vn poco la mano (come quaſi de neceſſi-<lb/>tà biſogna che ſi facia) ſaliua tanto, che vrtaua nel dito. </s>
  <s xml:id="echoid-s2559" xml:space="preserve"><lb/>Poſi nel cãnone dell’acqua ſino ad vn certo ſegno, &amp; </s>
  <s xml:id="echoid-s2560" xml:space="preserve">alzan-<lb/>do il cannone con empito, ceſſato pure queſto moto l’acqua <lb/>ſeguiua a ſalire, e mi bagnaua il dito. </s>
  <s xml:id="echoid-s2561" xml:space="preserve">Hora qui non v’è preſ-<lb/>ſione dell’aria, e pure per il ſolo alzamento veloce del can-<lb/>none ſeguiuano queſti alzamenti delli corpi in eſſo conte-<lb/>nuti; </s>
  <s xml:id="echoid-s2562" xml:space="preserve">li quali alzamenti non ſeguiuano quando il cannone <lb/>s’alzaua lentamente.</s>
  <s xml:id="echoid-s2563" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2564" xml:space="preserve">_Ofred._ </s>
  <s xml:id="echoid-s2565" xml:space="preserve">Ma qual’è la cagione di queſte ſalite?</s>
  <s xml:id="echoid-s2566" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2567" xml:space="preserve">_Matem._ </s>
  <s xml:id="echoid-s2568" xml:space="preserve">Nel mio cannone la cagione credo che ſia, che mentre <lb/>alziamo queſto, quel moto lo conferiamo ad eſſo, ed’alli <lb/>corpi in eſſo contenuti. </s>
  <s xml:id="echoid-s2569" xml:space="preserve">Quando lo fermiamo, li corpi con-<lb/>tenuti, cioè balla, &amp; </s>
  <s xml:id="echoid-s2570" xml:space="preserve">acqua, che non ſono continui ad eſſo, <lb/>non perdono così ſubito l’empito concepito, ma lo tratten-<lb/>gono per qualche tempo, e ſeguono il loro viaggio verſo <lb/>quella parte, verſo la quale ſe li ha già conferito il moto. <lb/></s>
  <s xml:id="echoid-s2571" xml:space="preserve">Che ſe per fortuna auuiene, che non ſolo fermiamo la ma-<lb/>no, ma anco queſta cali in parte co’lcannone, all’hora il <lb/>corpo contenuto già in moto verſo la parte ſuperiore, per-<lb/>cuote nel dito, come quello che diſcende ad’incontrarlo.</s>
  <s xml:id="echoid-s2572" xml:space="preserve"/>
</p>
<pb o="78" file="00084" n="84" rhead="DIALOGO"/>
<p>
  <s xml:id="echoid-s2573" xml:space="preserve">_Ofred._ </s>
  <s xml:id="echoid-s2574" xml:space="preserve">Crede V. </s>
  <s xml:id="echoid-s2575" xml:space="preserve">S. </s>
  <s xml:id="echoid-s2576" xml:space="preserve">che anco queſte ragioni ſi poſſino aſſegna re <lb/>al moto dell’argento viuo nella fiſtola?</s>
  <s xml:id="echoid-s2577" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2578" xml:space="preserve">_Matem._ </s>
  <s xml:id="echoid-s2579" xml:space="preserve">Aſſai più efficacemente. </s>
  <s xml:id="echoid-s2580" xml:space="preserve">E primieramente, ha mai oſſer-<lb/>uato Sig. </s>
  <s xml:id="echoid-s2581" xml:space="preserve">Ofredi, quando uno con tirare rompe vna fune, ò <lb/>coſa ſimile, l’effetto che fà la parte che li reſta in mano?</s>
  <s xml:id="echoid-s2582" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2583" xml:space="preserve">_Ofred._ </s>
  <s xml:id="echoid-s2584" xml:space="preserve">L’hò oſſeruato hieri con mio danno, che volendo accor-<lb/>dar vn Liuto, e tirando troppo, fi ſpezzò la corda, e la parte <lb/>che reſtò auolta al pirone mi colſe nel volto vicino ad vn <lb/>occhio, che quaſi m’hebbe ad acciecare.</s>
  <s xml:id="echoid-s2585" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2586" xml:space="preserve">_Matem._ </s>
  <s xml:id="echoid-s2587" xml:space="preserve">Pouero Sig. </s>
  <s xml:id="echoid-s2588" xml:space="preserve">Ofredi, ſe oltre alla curta viſta, che hà, de-<lb/>uentaua anco ciecolino. </s>
  <s xml:id="echoid-s2589" xml:space="preserve">Noti adunque, che nel ſepararſi vna <lb/>parte dall’altra, quella che reſta in mano sbalza verſo quel-<lb/>lo, che tira. </s>
  <s xml:id="echoid-s2590" xml:space="preserve">Tanto nell alzar con violenza la canna, non ſi fa <lb/>queſto ſtrapamento dell’argento viuo, che reſta nella can-<lb/>na, da quello, che reſta nel vaſo? </s>
  <s xml:id="echoid-s2591" xml:space="preserve">Ecco adunque, che vi è <lb/>qualche cagione di principio di moto verſo la ſtrada, che fà <lb/>la mano alzante. </s>
  <s xml:id="echoid-s2592" xml:space="preserve">Per ſecondo, come nel mio cannone, coſi <lb/>in queſta canna ſi conferiſce in queſto veloce alzamento al-<lb/>l’argento viuo quell’empito; </s>
  <s xml:id="echoid-s2593" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s2594" xml:space="preserve">eſsendo queſti corpo conti-<lb/>guo alla canna, per il fermar di queſta non languiſce <lb/>ſubito quell’empito, ma continuando per qualche tem-<lb/>po, continuerà anco il moto all’insù verſo la cima della <lb/>canna.</s>
  <s xml:id="echoid-s2595" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2596" xml:space="preserve">S’aggiunga per terzo, che ſicome il mezzo è d’impedimento <lb/>alle coſe, che per eſſo ſi muouono, e ſempre più, quāto è più <lb/>craſſo, e denſo; </s>
  <s xml:id="echoid-s2597" xml:space="preserve">coſi alla ſalita dell’argento viuo ſpiana la <lb/>ſtrada mirabilmente il vano, che reſta nella ſommità della fi-<lb/>ſtola per cui deue ſalire. </s>
  <s xml:id="echoid-s2598" xml:space="preserve">Il quale eſſendo ò vacuo, ò almeno <lb/>materia ſottiliſſima, laſcia che con tanto maggior empito <lb/>ſaliſca l’argento viuo.</s>
  <s xml:id="echoid-s2599" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2600" xml:space="preserve">Che s’aggiongeremo per vltimo, che chi alza la canna con <lb/>preſtezza, nel fine l’abbaſſi anco qualche poco, tanto più ve <lb/>locemente ſalirà l’argento viuo.</s>
  <s xml:id="echoid-s2601" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2602" xml:space="preserve">_Ofred._ </s>
  <s xml:id="echoid-s2603" xml:space="preserve">Realmente parmi, che queſte cagioni debbano interue-<lb/>nire nella ſalita di queſto argento viuo; </s>
  <s xml:id="echoid-s2604" xml:space="preserve">onde io reſto perſua-<lb/>ſo a confeſsare, che la preſſione dell’aria in queſto caſo, ò <lb/>non vi concorra, ò almeno ſolamente come cauſa partia-<lb/>le, Ma prouo bene, che la preſſione dell’ aria fa vn’ altro
<pb o="79" file="00085" n="85" rhead="SECONDO."/>
effetto in me, che non sò ſe facia in loro Signori. </s>
  <s xml:id="echoid-s2605" xml:space="preserve">Parmi <lb/>di hauer ripieno il ventre ſolo d’aria, che mi ſpinge ad an-<lb/>dar a pranſo; </s>
  <s xml:id="echoid-s2606" xml:space="preserve">perciò rimettiamo queſti noſtri diſcorſi ad vn-<lb/>altra volta.</s>
  <s xml:id="echoid-s2607" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2608" xml:space="preserve">_Matem._ </s>
  <s xml:id="echoid-s2609" xml:space="preserve">V.</s>
  <s xml:id="echoid-s2610" xml:space="preserve">S. </s>
  <s xml:id="echoid-s2611" xml:space="preserve">ha ragione; </s>
  <s xml:id="echoid-s2612" xml:space="preserve">credo che ſia tardo da douero. </s>
  <s xml:id="echoid-s2613" xml:space="preserve">A riue-<lb/>derſi frà qualche giorno, ritornato che ſia di Villa, oue deuo <lb/>portarmi doppo diſinare per alcuni miei intereſſi.</s>
  <s xml:id="echoid-s2614" xml:space="preserve"/>
</p>
</div>
<div xml:id="echoid-div21" type="section" level="1" n="12">
<head xml:id="echoid-head11" xml:space="preserve">IL FINE!</head>
<pb file="00086" n="86"/>
<pb file="00087" n="87"/>
<pb file="00088" n="88"/>
<pb file="00089" n="89"/>
</div>
<div xml:id="echoid-div22" type="section" level="1" n="13">
<head xml:id="echoid-head12" xml:space="preserve">DELLA GRAVITA <lb/>DELL <lb/>ARIA E FLVIDI <lb/>ESER CITATA</head>
<head xml:id="echoid-head13" xml:space="preserve">Principalmente nelli Ioro homogenei.</head>
<head xml:id="echoid-head14" xml:space="preserve">Dialogi Terzo, Quarto, e Quinto <lb/>Fiſico-matematici.</head>
<head xml:id="echoid-head15" xml:space="preserve">DI</head>
<head xml:id="echoid-head16" xml:space="preserve">STEFANO DEGL ANGELI <lb/>LETTOR MATEMATICO</head>
<head xml:id="echoid-head17" xml:space="preserve">Nello Studio diPadoua.</head>
  <figure>
    <image file="00089-01" xlink:href="http://echo.mpiwg-berlin.mpg.de/zogilib?fn=/permanent/library/9EXVCG1R/figures/00089-01"/>
  </figure>
</div>
<div xml:id="echoid-div23" type="section" level="1" n="14">
<head xml:id="echoid-head18" xml:space="preserve">IN PADOVA, MDCLXXII.</head>
<head xml:id="echoid-head19" xml:space="preserve">Per Mattio Cadorin, Con licenza de Superiori.</head>
<pb file="00090" n="90"/>
<pb file="00091" n="91"/>
</div>
<div xml:id="echoid-div24" type="section" level="1" n="15">
<head xml:id="echoid-head20" xml:space="preserve">ALL’ILLVSTRISSIMO</head>
<head xml:id="echoid-head21" style="it" xml:space="preserve">ET ECCELLENTISS. SIGNOR</head>
<head xml:id="echoid-head22" xml:space="preserve">FRANCESCO MARIA <lb/>RIARIO</head>
<head xml:id="echoid-head23" xml:space="preserve">Marcheſe di Caſtiglione d’Orcia, Nobile Veneto, <lb/>e Senatore di Bologna, Felicità.</head>
<head xml:id="echoid-head24" style="it" xml:space="preserve">ILLVSTRISS. ET ECCELLENTIS. SIG.</head>
<p>
  <s xml:id="echoid-s2615" xml:space="preserve">SIno dalla mia giouentù, <lb/>mentre mi ritrouauo in Bo. <lb/></s>
  <s xml:id="echoid-s2616" xml:space="preserve">logna per attendere alle ma <lb/>tematiche ſotto la diret tio-<lb/>ne del P. </s>
  <s xml:id="echoid-s2617" xml:space="preserve">Caualieri, hebbi <lb/>fortuna di far acquiſto della protettio-<lb/>ne della nobiliſſima caſa Riaria, con-<lb/>ceſſami benign <gap/> dal Marcheſe <lb/>Ferdinando glorioſo Padre dell’Ecc. </s>
  <s xml:id="echoid-s2618" xml:space="preserve">V. </s>
  <s xml:id="echoid-s2619" xml:space="preserve"><lb/>Nel qual poſseſſo hauendomi poi lei <lb/>ſucceſſiuamente con pari liberalità cõ-<lb/>ſeruato, hò ſempre ſoſpirato l’occaſio-<lb/>ni di poterle dimoſtrare qualche ſe-<lb/>gno della mia gratitudine. </s>
  <s xml:id="echoid-s2620" xml:space="preserve">Ma cono-
<pb file="00092" n="92"/>
ſcendo eſſer tali la ſua, e mia conditio-<lb/>ne, che non mi ſia da queſte permeſſo <lb/>il poter far altro che confeſſarmi pu-<lb/>blicamente debitore, e di groſiſſima <lb/>ſomma, riſoluo farlo con la preſente oc-<lb/>caſione della ſtãpa di queſti mier Dia-<lb/>logi Fiſicomatematici. </s>
  <s xml:id="echoid-s2621" xml:space="preserve">ll che eſequiſco <lb/>con tanta maggior confidenza, quanto <lb/>eſſendo vniuerſalmente nota la gran <lb/>peritia dell’E. </s>
  <s xml:id="echoid-s2622" xml:space="preserve">V. </s>
  <s xml:id="echoid-s2623" xml:space="preserve">in ſimili, &amp; </s>
  <s xml:id="echoid-s2624" xml:space="preserve">altre ma-<lb/>terie, ſpero che la mia confeſſione ſia <lb/>per eſſe più ben viſta, mentre li com-<lb/>pariſca auanti introdotta da coſe tan-<lb/>to a lei familiari. </s>
  <s xml:id="echoid-s2625" xml:space="preserve">Gradiſca adunque <lb/>l’E. </s>
  <s xml:id="echoid-s2626" xml:space="preserve">V. </s>
  <s xml:id="echoid-s2627" xml:space="preserve">con quella grandezza d animo <lb/>che hà heredita@@ dac@ſi lunga ſerie <lb/>dinobiliſſimi antenati que<gap/>ſta-<lb/>to d@@ſe mie obligationi, mentre non <lb/>vaglio in altro, che nel poter rephcar <lb/>ſempre d’eſſere</s>
</p>
<p>
  <s xml:id="echoid-s2628" xml:space="preserve">Di V. </s>
  <s xml:id="echoid-s2629" xml:space="preserve">Ecc.</s>
  <s xml:id="echoid-s2630" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2631" xml:space="preserve">Padoua li 10. </s>
  <s xml:id="echoid-s2632" xml:space="preserve">Luglio 1672.</s>
  <s xml:id="echoid-s2633" xml:space="preserve"/>
</p>
<p style="it">
  <s xml:id="echoid-s2634" xml:space="preserve">Humiliſs: </s>
  <s xml:id="echoid-s2635" xml:space="preserve">e Obligatiſs. </s>
  <s xml:id="echoid-s2636" xml:space="preserve">Seruitore <lb/>Stefano Angeli.</s>
  <s xml:id="echoid-s2637" xml:space="preserve"/>
</p>
<pb file="00093" n="93"/>
  <figure>
    <image file="00093-01" xlink:href="http://echo.mpiwg-berlin.mpg.de/zogilib?fn=/permanent/library/9EXVCG1R/figures/00093-01"/>
  </figure>
</div>
<div xml:id="echoid-div25" type="section" level="1" n="16">
<head xml:id="echoid-head25" xml:space="preserve">AL LETTORE.</head>
<p style="it">
  <s xml:id="echoid-s2638" xml:space="preserve">ECcoti, Benigno Lettore, tre delli miei Dialogi in <lb/>ſeguimento delli due primi già qualche Meſe pu-<lb/>blicati. </s>
  <s xml:id="echoid-s2639" xml:space="preserve">A queſti ne ſeguiranno delli altri, ſe <lb/>Dio ſi compiacerà di concedermi pita, ſanità, <lb/>e miglior fortuna di quella, che prouo. </s>
  <s xml:id="echoid-s2640" xml:space="preserve">Le <lb/>cauſe di publicarli ſono le medeſime, le qua-<lb/>li nelli altri due ti bo eſpreſſe; </s>
  <s xml:id="echoid-s2641" xml:space="preserve">perciò non le re-<lb/>plico. </s>
  <s xml:id="echoid-s2642" xml:space="preserve">Solo di nuouo torno ad inculcare, che io <lb/>in eſſinon pretendo alcun primato, e panto d’inuentor primiero; </s>
  <s xml:id="echoid-s2643" xml:space="preserve">la-<lb/>ſciando queſte lodi à chi, ò le merita, ò pretende di meritarle. <lb/></s>
  <s xml:id="echoid-s2644" xml:space="preserve">Viui felice.</s>
  <s xml:id="echoid-s2645" xml:space="preserve"/>
</p>
  <figure>
    <image file="00093-02" xlink:href="http://echo.mpiwg-berlin.mpg.de/zogilib?fn=/permanent/library/9EXVCG1R/figures/00093-02"/>
  </figure>
<pb file="00094" n="94"/>
</div>
<div xml:id="echoid-div26" type="section" level="1" n="17">
<head xml:id="echoid-head26" xml:space="preserve">NOI REFORMATORI</head>
<head xml:id="echoid-head27" xml:space="preserve">Dello Studio di Padoua.</head>
<p>
  <s xml:id="echoid-s2646" xml:space="preserve">HAuendo veduto per fede del Padre Inquiſitore di Pado-<lb/>ua nell’opera intitolata Dialogo terzo, quarto, e quin-<lb/>to ſopra la grauità dell’aria di D. </s>
  <s xml:id="echoid-s2647" xml:space="preserve">Stefano Angeli Matemati-<lb/>co Publico in Padoua, non eſſerui coſa alcuna contro la San-<lb/>ta Fede Catolica, e parimente per atteſtato del Segretario <lb/>noſtro, niente contro Prencipi, e buoni coſtumi, concede, <lb/>mo licenza à Matteo Cadorini di poterla ſtampare oſſer-<lb/>uando gli ordini, &amp;</s>
  <s xml:id="echoid-s2648" xml:space="preserve">c.</s>
  <s xml:id="echoid-s2649" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2650" xml:space="preserve">Dat. </s>
  <s xml:id="echoid-s2651" xml:space="preserve">à 6. </s>
  <s xml:id="echoid-s2652" xml:space="preserve">Luglio 1672.</s>
  <s xml:id="echoid-s2653" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2654" xml:space="preserve">(</s>
</p>
<p>
  <s xml:id="echoid-s2655" xml:space="preserve">(Nicolò Sagredo K. </s>
  <s xml:id="echoid-s2656" xml:space="preserve">Proc. </s>
  <s xml:id="echoid-s2657" xml:space="preserve">Ref.</s>
  <s xml:id="echoid-s2658" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2659" xml:space="preserve">(Pietro Baſadonna K. </s>
  <s xml:id="echoid-s2660" xml:space="preserve">Proc. </s>
  <s xml:id="echoid-s2661" xml:space="preserve">Ref.</s>
  <s xml:id="echoid-s2662" xml:space="preserve"/>
</p>
<p style="it">
  <s xml:id="echoid-s2663" xml:space="preserve">Angelo Nicoloſi Segr.</s>
  <s xml:id="echoid-s2664" xml:space="preserve"/>
</p>
<pb o="1" file="00095" n="95"/>
  <figure>
    <image file="00095-01" xlink:href="http://echo.mpiwg-berlin.mpg.de/zogilib?fn=/permanent/library/9EXVCG1R/figures/00095-01"/>
  </figure>
</div>
<div xml:id="echoid-div27" type="section" level="1" n="18">
<head xml:id="echoid-head28" xml:space="preserve">DIALOGO TERZO</head>
<head xml:id="echoid-head29" xml:space="preserve">Della grauità dell’ Aria, &amp;c.</head>
<head xml:id="echoid-head30" xml:space="preserve">INTERLOCVTORI <lb/>CONTE LESZCYNSKY, <lb/>OFREDI, E MATEMATICO DI PADOVA.</head>
<p>
  <s xml:id="echoid-s2665" xml:space="preserve">O_Fredi._ </s>
  <s xml:id="echoid-s2666" xml:space="preserve">Ben ritornato dalla Villa Sig. </s>
  <s xml:id="echoid-s2667" xml:space="preserve">Profeſ-<lb/>ſore. </s>
  <s xml:id="echoid-s2668" xml:space="preserve">In verità che il Signor Conte, &amp; </s>
  <s xml:id="echoid-s2669" xml:space="preserve">io <lb/>l’habbiamo deſiderato al più alto ſegno.</s>
  <s xml:id="echoid-s2670" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2671" xml:space="preserve">_Mat._ </s>
  <s xml:id="echoid-s2672" xml:space="preserve">Non minor deſiderio hò hauuto io <lb/>della non meno gioconda, che vtile con-<lb/>uerſatione delle Signorie loro in quella <lb/>ſolitudine. </s>
  <s xml:id="echoid-s2673" xml:space="preserve">E mi rallegro ſommamente <lb/>d’hauerle ritrouate con buona ſalute. </s>
  <s xml:id="echoid-s2674" xml:space="preserve">Mà <lb/>perche hanno tanto deſiderato il mio ritorno? </s>
  <s xml:id="echoid-s2675" xml:space="preserve">La coſcien-<lb/>za non mi rimorde che io li ſia debitore di coſa alcuna.</s>
  <s xml:id="echoid-s2676" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2677" xml:space="preserve">_fred._ </s>
  <s xml:id="echoid-s2678" xml:space="preserve">A mè è debitore certamente; </s>
  <s xml:id="echoid-s2679" xml:space="preserve">poiche con li ſuoi antece-<lb/>denti diſcorſi hauendomi riempito il capo con certe dottri-<lb/>ne, non trouo poi l’eſperienze per l’appunto corriſponder <lb/>ad eſſe. </s>
  <s xml:id="echoid-s2680" xml:space="preserve">Queſt’è la cagione che io in particolare anſioſa-<lb/>mente deſiderauo il ſuo ritorno; </s>
  <s xml:id="echoid-s2681" xml:space="preserve">quale da mè ſa puto, ſubito <lb/>ſono venuto col Sig. </s>
  <s xml:id="echoid-s2682" xml:space="preserve">Conte à riuerirla.</s>
  <s xml:id="echoid-s2683" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2684" xml:space="preserve">_at._ </s>
  <s xml:id="echoid-s2685" xml:space="preserve">Se ſarò debitore, vedrò di ſodisfarla, ſe potrò. </s>
  <s xml:id="echoid-s2686" xml:space="preserve">Reſta ſolo <lb/>che V. </s>
  <s xml:id="echoid-s2687" xml:space="preserve">S. </s>
  <s xml:id="echoid-s2688" xml:space="preserve">me notifichi la qualità, e quantità del debito, ſen-<lb/>za riccorrere à Magiſtrati; </s>
  <s xml:id="echoid-s2689" xml:space="preserve">poiche non intendo che in que-
<pb o="2" file="00096" n="96" rhead="DIALOGO"/>
ſta noſtra cauſa, nè Auuocati, ne altri ſimili habbino da ſta-<lb/>re allegramente pure con vno delli miei dinari.</s>
  <s xml:id="echoid-s2690" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2691" xml:space="preserve">_Cont_. </s>
  <s xml:id="echoid-s2692" xml:space="preserve">Le pretenſioni del Sig. </s>
  <s xml:id="echoid-s2693" xml:space="preserve">Ofredi gle le rappreſentarò io; </s>
  <s xml:id="echoid-s2694" xml:space="preserve">ac-<lb/>ciò egli parlando in cauſa propria, &amp; </s>
  <s xml:id="echoid-s2695" xml:space="preserve">eſſendo toſſicoſo co-<lb/>me vna Rapa, e bilioſo, e colerico quant’vn’ A gnello,</s>
</p>
<p>
  <s xml:id="echoid-s2696" xml:space="preserve">_Ofre_. </s>
  <s xml:id="echoid-s2697" xml:space="preserve">V. </s>
  <s xml:id="echoid-s2698" xml:space="preserve">S. </s>
  <s xml:id="echoid-s2699" xml:space="preserve">principia à buon’hora con li ſcherzi,</s>
</p>
<p>
  <s xml:id="echoid-s2700" xml:space="preserve">_Cont_. </s>
  <s xml:id="echoid-s2701" xml:space="preserve">Non ſi riſcaldaſſe di ſouerchio; </s>
  <s xml:id="echoid-s2702" xml:space="preserve">eſſendomi beniſſimo note <lb/>per li diſcorſi, che habbiamo hauuto inſieme in queſti gior-<lb/>ni della ſua aſſenza; </s>
  <s xml:id="echoid-s2703" xml:space="preserve">nelli quali vnita mente ſiamo andati ſtu-<lb/>diando, e illibro del Sig. </s>
  <s xml:id="echoid-s2704" xml:space="preserve">Sinclaro, del quale più volte hab-<lb/>biamo parlato nelli noſtri paſſati colloqui, &amp; </s>
  <s xml:id="echoid-s2705" xml:space="preserve">altri; </s>
  <s xml:id="echoid-s2706" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s2707" xml:space="preserve">hab-<lb/>biamo trouato _nel Lib_. </s>
  <s xml:id="echoid-s2708" xml:space="preserve">2. </s>
  <s xml:id="echoid-s2709" xml:space="preserve">del detto Signore, che racconta <lb/>molt’eſperienze da eſſo fatte in diuerſi luoghi di piano, e di <lb/>monte più, e meno alti, per vedere, che differenza vi era <lb/>nella ſaIita, e diſceſa dell’argentouiuo.</s>
  <s xml:id="echoid-s2710" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2711" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s2712" xml:space="preserve">Intendo beniſſimo. </s>
  <s xml:id="echoid-s2713" xml:space="preserve">Anch egli, e in luoghi piani, e in luo-<lb/>ghi montuoſi hà fatto l’eſperienza del Tubo Torricelliano <lb/>così chiamato volgarmente, per cagione del gran Torri-<lb/>celli, che l’inuentò (da eſſo detto con nome ſpeciale Baro <lb/>ſcopio, quaſi iſtrumento da miſurare, e ſpeculare la grauità <lb/>e preſſione dell’aria,) come hanno fatto infiniti altri; </s>
  <s xml:id="echoid-s2714" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s2715" xml:space="preserve">ha-<lb/>uerà trouato, che nelli luoghi piani ſaliſce il mercurio ſino <lb/>alli diti 29. </s>
  <s xml:id="echoid-s2716" xml:space="preserve">ſecondo la ſua miſura di ſcotia, e nelli mont <lb/>meno, e meno, conforme che queſti ſono più, e più alti.</s>
  <s xml:id="echoid-s2717" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2718" xml:space="preserve">_Cont_. </s>
  <s xml:id="echoid-s2719" xml:space="preserve">Così appunto. </s>
  <s xml:id="echoid-s2720" xml:space="preserve">Mà quello, che nè fa difficoltà, e che no<gap/> <lb/>potiamo intender à pieno, è, che _nel nu_. </s>
  <s xml:id="echoid-s2721" xml:space="preserve">3. </s>
  <s xml:id="echoid-s2722" xml:space="preserve">dice, che volend<gap/> <lb/>far queſte diuerſe eſperienze, non riempì il Baroſcopio al<gap/> <lb/>le radici del monte, e con eſſo così pieno ſalì ad alto, pe<gap/> <lb/>notare le differenze delle ſue altezze ſucceſſiuamente con<gap/> <lb/>forme che più, e più aſcendeua, come ſi legge appreſſo Pe<gap/> <lb/>queto _nel lib. </s>
  <s xml:id="echoid-s2723" xml:space="preserve">delle nuoue eſperienze Anatomiche_, hauer fatt<gap/> <lb/>Paſchalio ſopra li monti dell’ A luernia, e credo hauer vſat<gap/> <lb/>tutti li altri; </s>
  <s xml:id="echoid-s2724" xml:space="preserve">mà in tutti li luoghi riempiua di nuouo l’iſtru<gap/> <lb/>mento; </s>
  <s xml:id="echoid-s2725" xml:space="preserve">dicendo il modo delli altri non eſſer à propoſito <gap/> <lb/>non in caſo che l’iſtrumento ſi poteſſe portare ſenz’ agita<gap/> <lb/>tione. </s>
  <s xml:id="echoid-s2726" xml:space="preserve">Ma _cum ob montis prærupta aſperitatemque nemo tacito pe<gap/>_ <lb/>_de, ſuſpenſoque gradu aſcendere queat, vnde multa corporis, Baro<gap/>_ <lb/>_ſcopijq; </s>
  <s xml:id="echoid-s2727" xml:space="preserve">agitatio, fieri non poteſt, quin humilius, ac depreſſius debit<gap/>_
<pb o="3" file="00097" n="97" rhead="TERZO"/>
_agitatus concuſſuſque mercurius, iſque perpetim deorſum nitens,_ <lb/>_defluat, &amp; </s>
  <s xml:id="echoid-s2728" xml:space="preserve">ſubſidat, vt certa comperi experientia._</s>
  <s xml:id="echoid-s2729" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2730" xml:space="preserve">Di più, _nel n._ </s>
  <s xml:id="echoid-s2731" xml:space="preserve">7. </s>
  <s xml:id="echoid-s2732" xml:space="preserve">narrando come faceſſe queſt’ eſperienza alzan-<lb/>do sù il Baroſcopio con’vna fune ſopra la Torre della Cat-<lb/>tedrale di Glaſquo, dice, che alzato in alto, calò dalla prima <lb/>altezza 5. </s>
  <s xml:id="echoid-s2733" xml:space="preserve">delle 32. </s>
  <s xml:id="echoid-s2734" xml:space="preserve">parti d’vn dito; </s>
  <s xml:id="echoid-s2735" xml:space="preserve">e di nuouo calato al baſ-<lb/>ſo, ritornò quaſi alla medema altezza. </s>
  <s xml:id="echoid-s2736" xml:space="preserve">E ſoggiunge, _Di-_ <lb/>_xi ferè, quoniam procul omni dubio, Hydrargyrus ob ſuam puram_ <lb/>_grauitatem inter aſcendendum plus ſubſedit, quam inter deſcenden-_ <lb/>_dum, in tubo aſcendere potest_. </s>
  <s xml:id="echoid-s2737" xml:space="preserve">Queſta coſa non la potiamo in-<lb/>tendere; </s>
  <s xml:id="echoid-s2738" xml:space="preserve">cioè perche ſempre il mercurio non ſaliſca, ò di-<lb/>ſcenda alla medema altezza nel medemo luogo, ceſſata che <lb/>ſia l’agitatione; </s>
  <s xml:id="echoid-s2739" xml:space="preserve">perche ſalendo ad vna tal altezza per il mo-<lb/>mento, che li fà l’atmosfera, come hora è tenuto comu-<lb/>nemente, e V. </s>
  <s xml:id="echoid-s2740" xml:space="preserve">S. </s>
  <s xml:id="echoid-s2741" xml:space="preserve">hà confeſſato _Dial. </s>
  <s xml:id="echoid-s2742" xml:space="preserve">2. </s>
  <s xml:id="echoid-s2743" xml:space="preserve">pag_. </s>
  <s xml:id="echoid-s2744" xml:space="preserve">54. </s>
  <s xml:id="echoid-s2745" xml:space="preserve">eſſendo che <lb/>queſto momento alle radici del monte, ò al piano della tor-<lb/>re è ſempre il medemo, pare anco che ceſſata l’agitatione, <lb/>debba reſtituirlo alla priſtin’altezza, e non ad vna minore.</s>
  <s xml:id="echoid-s2746" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2747" xml:space="preserve">_Ofr_. </s>
  <s xml:id="echoid-s2748" xml:space="preserve">Così parmi che di neceſſità biſogna che ſegua Ne parmi <lb/>che queſto effetto poſſa attribuirſi alla grauità del mercu-<lb/>rio, come fà il Sig. </s>
  <s xml:id="echoid-s2749" xml:space="preserve">Sinclaro, perche douendoſi far l’equili-<lb/>brio trà la medema aria, e il medemo mercurio, non sò co-<lb/>fa habbia quì da fare la grauita; </s>
  <s xml:id="echoid-s2750" xml:space="preserve">e come poſſa farſi queſt’e-<lb/>quilibrio, ſe il mercurio non è il medemo, ma meno alto, <lb/>e minore.</s>
  <s xml:id="echoid-s2751" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2752" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s2753" xml:space="preserve">Loro Signori fanno vna ſuppoſitione molto impropria, <lb/>e falſa. </s>
  <s xml:id="echoid-s2754" xml:space="preserve">Suppongono che ſempre il mercurio nel medemo <lb/>luogo ſaliſca alla medema altezza; </s>
  <s xml:id="echoid-s2755" xml:space="preserve">il che è falſiſſimo, e per <lb/>ragione, e per iſperienza. </s>
  <s xml:id="echoid-s2756" xml:space="preserve">Per ragione, perche ſalendo ad <lb/>vna tal altezza per la preſſione dell’atmosfera; </s>
  <s xml:id="echoid-s2757" xml:space="preserve">eſſendo che <lb/>queſta è ſempre varia, ed inconſtante; </s>
  <s xml:id="echoid-s2758" xml:space="preserve">varia anco, ed’incon-<lb/>ſtante biſogna che ſia l’altezza del mercurio. </s>
  <s xml:id="echoid-s2759" xml:space="preserve">L’eſperienza <lb/>poi è così manifeſta, che non vi è alcuno, che nari queſto <lb/>Fenomeno, il quale non auuertiſca queſto accidente. </s>
  <s xml:id="echoid-s2760" xml:space="preserve">Frà <lb/>li altri li nobiliſſimi Accademici del Cimento _nelli ſaggi di_ <lb/>_varie eſperienze_ fatte alla preſenza di quel gran Mecenate <lb/>delle lettere dico del Sereniſſimo Prencipe Cardinal Leo-<lb/>poldo Medici, in più luoghi, ma principalmente _alla pag 26._</s>
  <s xml:id="echoid-s2761" xml:space="preserve">
<pb o="4" file="00098" n="98" rhead="DIALOGO"/>
dopò hauer detto, che il mercurio ſaliſca ſin’all’altezza d’-<lb/>vn braccio Fiorentino, &amp; </s>
  <s xml:id="echoid-s2762" xml:space="preserve">vn quarto, dicono le ſeguenti pa-<lb/>role. </s>
  <s xml:id="echoid-s2763" xml:space="preserve">_Queſt’ altezza quantunque pochiſſimo per esterni accidenti di_ <lb/>_calore, e di freddo, e alquanto più, per le staggioni varie, e ſtati di-_ <lb/>_uerſi dell’ aria ſi ſia oſſeruata variare, come da vna lunghiſſima ſerie_ <lb/>_di noſtre oſſeruationi manifeſtamente appare; </s>
  <s xml:id="echoid-s2764" xml:space="preserve">tuttauia per eſſer tali_ <lb/>_variationi aſſai piccole, ſarà da quì auanti denominata ſempre_ <lb/>_della ſteßa miſura d’vn braccio, e vn quarto, come la più proſſima di_ <lb/>_qualunque altra_. </s>
  <s xml:id="echoid-s2765" xml:space="preserve">Stando adunque ciò, potria eſſere che di <lb/>queſte diuerſità di ſalite del mercurio nel medemo luogo, <lb/>cioè alle radici del monte, ò al piano della torre dopò rica-<lb/>lato il Baroſcopio, ne foſſe cagione il diuerſo calore intro-<lb/>dotto nell’aria, ò altra uarietà in eſſa proueniente da <lb/>maggior, ò minor imgombramento di nuole, ò altri ac-<lb/>cidenti diuerſiſſimi.</s>
  <s xml:id="echoid-s2766" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2767" xml:space="preserve">_Cont_. </s>
  <s xml:id="echoid-s2768" xml:space="preserve">Benche queſte dottrine, &amp; </s>
  <s xml:id="echoid-s2769" xml:space="preserve">eſperienze ſiano veriſſime; <lb/></s>
  <s xml:id="echoid-s2770" xml:space="preserve">nulladimeno noi non vogliamo che habbino luogo in que-<lb/>ſto caſo. </s>
  <s xml:id="echoid-s2771" xml:space="preserve">Perche ſe da eſſe haueſſe hauuto origine queſto <lb/>Fenomeno, crediamo che il Sig. </s>
  <s xml:id="echoid-s2772" xml:space="preserve">Sinclaro ciò hauerebbe co-<lb/>noſciuto; </s>
  <s xml:id="echoid-s2773" xml:space="preserve">e non ſarebbe ricorſo alla grauità del mercurio. </s>
  <s xml:id="echoid-s2774" xml:space="preserve"><lb/>Più recondita adunque, &amp; </s>
  <s xml:id="echoid-s2775" xml:space="preserve">aſtruſa è la ſua cauſa; </s>
  <s xml:id="echoid-s2776" xml:space="preserve">e biſogna <lb/>procurar d’indagarla.</s>
  <s xml:id="echoid-s2777" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2778" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s2779" xml:space="preserve">Faciaſi quello che comandano. </s>
  <s xml:id="echoid-s2780" xml:space="preserve">Tanto più che ſe bene <lb/>forſe non caueremo dal pozzo la vera cagione, peſchare-<lb/>mo nulladimeno per auentura qualche coſa in altri propo-<lb/>ſiti, che non s’hauremo da pentire d’hauer ſparſo le fatiche <lb/>al vento. </s>
  <s xml:id="echoid-s2781" xml:space="preserve">E per caminare ordinatamente, potiamo conſi-<lb/>derare, che dicendo il Sig. </s>
  <s xml:id="echoid-s2782" xml:space="preserve">Sinclaro ſucceder queſt’ effetto <lb/>quando il mercurio viene agitato, potiamo confeſſare ra-<lb/>gioneuolmente che di queſto Fenomeno ne ſia cagione la <lb/>pura agitatione. </s>
  <s xml:id="echoid-s2783" xml:space="preserve">Reſta che conſideriamo come ciò poſſa <lb/>fuccedere. </s>
  <s xml:id="echoid-s2784" xml:space="preserve">Io à queſto propoſito noto vn’altra oſſeruatio-<lb/>ne del Sig Sinclaro _nel lib_. </s>
  <s xml:id="echoid-s2785" xml:space="preserve">1. </s>
  <s xml:id="echoid-s2786" xml:space="preserve">_Dial. </s>
  <s xml:id="echoid-s2787" xml:space="preserve">3. </s>
  <s xml:id="echoid-s2788" xml:space="preserve">n. </s>
  <s xml:id="echoid-s2789" xml:space="preserve">2_. </s>
  <s xml:id="echoid-s2790" xml:space="preserve">oue dice, che ſe riem-<lb/>pito il Baroſcopio d’argentouiuo, ſe le caccierà dentro più <lb/>volte vn ſottiliſſimo fil di ferro, queſto farà vſcir fuori dall’-<lb/>detto argentouiuo le particole dell’aria, che ſtanno naſco-<lb/>ſte entro eſfo. </s>
  <s xml:id="echoid-s2791" xml:space="preserve">Nel qual caſo purgato che ſia il mercurio <lb/>dall’aria, ſalirà vn poco più, che quando non s’vſa queſta
<pb o="5" file="00099" n="99" rhead="TERZO."/>
diligenza. </s>
  <s xml:id="echoid-s2792" xml:space="preserve">Il che ſtando, e fatto il voto con l’argento non <lb/>purgato dall’aria, ſalendo queſta ſopra eſſo, la cagione di <lb/>queſta minor ſalita dell’argento pare che debba attribuirſi <lb/>à queſt’aria.</s>
  <s xml:id="echoid-s2793" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2794" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s2795" xml:space="preserve">Se così è, parmi che ragioneuolmente ſi debba dire, che <lb/>in tanto il mercurio agitato reſtituito al medemo luogo <lb/>non ritorni alla medema altezza, mà minore, perche con <lb/>l’agitatione ſi facia ſalir l’aria nella ſommità di lui, la qua-<lb/>le prima foſſe con eſſo meſcolata.</s>
  <s xml:id="echoid-s2796" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2797" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s2798" xml:space="preserve">V. </s>
  <s xml:id="echoid-s2799" xml:space="preserve">S. </s>
  <s xml:id="echoid-s2800" xml:space="preserve">è più miracoloſo nel dedur conſeguenze, che non <lb/>era Archimede nell’ alzar le Gallere de Romani con la ma-<lb/>no di ferro. </s>
  <s xml:id="echoid-s2801" xml:space="preserve">Queſta conſeguenza è molto faticoſa da dedu-<lb/>re; </s>
  <s xml:id="echoid-s2802" xml:space="preserve">credo però che à caſo in parte habbi tocco il punto.</s>
  <s xml:id="echoid-s2803" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2804" xml:space="preserve">_Cont_. </s>
  <s xml:id="echoid-s2805" xml:space="preserve">Il Sig. </s>
  <s xml:id="echoid-s2806" xml:space="preserve">Sinclaro leua queſto ſutterfugio, mentre dice _nel_ <lb/>_lib 2. </s>
  <s xml:id="echoid-s2807" xml:space="preserve">Dial. </s>
  <s xml:id="echoid-s2808" xml:space="preserve">1. </s>
  <s xml:id="echoid-s2809" xml:space="preserve">n. </s>
  <s xml:id="echoid-s2810" xml:space="preserve">3. </s>
  <s xml:id="echoid-s2811" xml:space="preserve">cit._ </s>
  <s xml:id="echoid-s2812" xml:space="preserve">che nel fare queſt’ eſperienza, _Baroſcopij_ <lb/>_tubum, ſumma cura ac diligentia, ad ſummam vſque oram, Hydrar-_ <lb/>_gyro impleuit, omnibus extruſis ope fili ferrei, aeris particulis in-_ <lb/>_ter Hydargyri particulas latitantibus._</s>
  <s xml:id="echoid-s2813" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2814" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s2815" xml:space="preserve">Parmi che con quell’ _Omnibus particulis_, il Sig. </s>
  <s xml:id="echoid-s2816" xml:space="preserve">Sinclaro ſi <lb/>reſtringa troppo; </s>
  <s xml:id="echoid-s2817" xml:space="preserve">poiche io dubito, che quãto più s’agiterà, <lb/>ſempre ſi far à ſalire dell’aria.</s>
  <s xml:id="echoid-s2818" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2819" xml:space="preserve">_Ofre_. </s>
  <s xml:id="echoid-s2820" xml:space="preserve">Che vuole V S. </s>
  <s xml:id="echoid-s2821" xml:space="preserve">che l’aria meſcolata con l’argentouiuo ſia <lb/>infinita?</s>
  <s xml:id="echoid-s2822" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2823" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s2824" xml:space="preserve">Non dico che ſia infinita, ma tanta, che ſempre ve ne <lb/>farà, ſino che vi ſarà mercurio. </s>
  <s xml:id="echoid-s2825" xml:space="preserve">Qu<unsure/>eſt’aria poi credo che <lb/>almeno in buona parte, non ſia altro che li efluui, à quali <lb/>con l’agitatione ſi facilita l’vſcita dall argentouiuo; </s>
  <s xml:id="echoid-s2826" xml:space="preserve">liberan-<lb/>doli dall’implicatione, neſſo, e ſtrengimento, che li viene fat-<lb/>to dalle altre particelle; </s>
  <s xml:id="echoid-s2827" xml:space="preserve">agiutando con queſto moto eſterno <lb/>quell’ interno nel quale forſe ſono perpetuamẽte. </s>
  <s xml:id="echoid-s2828" xml:space="preserve">Così s’a-<lb/>gitaremo con vna mano l’acqua cõtenuta entro vn vaſo, ve <lb/>dremo vna moltitudine di bolle, le quali in buona parte nõ <lb/>ſono altro che aria; </s>
  <s xml:id="echoid-s2829" xml:space="preserve">cioè efluui, a quali con l’agitatione ſe fa-<lb/>cilita la via ad vſcir dall’acqua. </s>
  <s xml:id="echoid-s2830" xml:space="preserve">Et à queſto propoſito hò oſ-<lb/>ſeruato à Venetia, che quando li noſtri Barcaroli per li ca, <lb/>nali cacciano il Remo nel fango, ò che altri caccia vn palo <lb/>in eſſo, ò fitto che egli ſia, procura agitandolo quà, e là, ca-<lb/>uarlo da eſſo, che ſaliſcono molte bolle d’aria; </s>
  <s xml:id="echoid-s2831" xml:space="preserve">le quali non
<pb o="6" file="00100" n="100" rhead="DIALOGO"/>
ſono altro che efluui, cioè particolle più leggieri, e pronte <lb/>al moto, che con quelle ſpinte, ò agitationi ſono liberate <lb/>dalla priggionia, che li cauſaua la tenacità, e viſcoſità del <lb/>fango, &amp; </s>
  <s xml:id="echoid-s2832" xml:space="preserve">altro. </s>
  <s xml:id="echoid-s2833" xml:space="preserve">E coſa famoſa appreſſo li Chimici, che tut ti li <lb/>corpi habbino particelle volatili, alle quali è facilitato il vo-<lb/>lo dall’ agitationi.</s>
  <s xml:id="echoid-s2834" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2835" xml:space="preserve">_Cont_. </s>
  <s xml:id="echoid-s2836" xml:space="preserve">V. </s>
  <s xml:id="echoid-s2837" xml:space="preserve">Sig. </s>
  <s xml:id="echoid-s2838" xml:space="preserve">pennerà molto poco in perſuadere queſto alli <lb/>Epicurei. </s>
  <s xml:id="echoid-s2839" xml:space="preserve">Li quali empiamente dicendo il mondo eſſer ſta-<lb/>to prodotto dal fortuito concorſo delli atomi; </s>
  <s xml:id="echoid-s2840" xml:space="preserve">e percio tut-<lb/>ti queſti trattenere innata vna mobilità inſeparabile, e mo-<lb/>to attuale, ò irrequieta propenſione ad eſſo, con la quale <lb/>ſempre procurino liberarſi da quel neſſo, il che cauſi final-<lb/>mente il ſcioglimento di tutti li corpi; </s>
  <s xml:id="echoid-s2841" xml:space="preserve">facilmente s’accor-<lb/>deranno in concedere che il moto eſtrinſeco dell’agitatione <lb/>faciliti queſto ſcioglimento. </s>
  <s xml:id="echoid-s2842" xml:space="preserve">Ne forſe hauerà biſogno di <lb/>maggior fatica per perſuadere ciò anco alli Carteſiani. </s>
  <s xml:id="echoid-s2843" xml:space="preserve">Li <lb/>quali volendo che quella ſua materia ſottile, che à guiſa di <lb/>fiume rapido ſcorre da per tutto, penetri per li pori delli <lb/>corpi; </s>
  <s xml:id="echoid-s2844" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s2845" xml:space="preserve">in conſequenza concuti le loro minime particelle <lb/>non recuſeranno queſt’agiuto dell’agitatione.</s>
  <s xml:id="echoid-s2846" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2847" xml:space="preserve">_Ofr_. </s>
  <s xml:id="echoid-s2848" xml:space="preserve">Ne meno V. </s>
  <s xml:id="echoid-s2849" xml:space="preserve">S. </s>
  <s xml:id="echoid-s2850" xml:space="preserve">pennerà molto in perſuaderlo anco à me <lb/>Hauendo io oſſeruato più volte, che agitandoſi, ò acqua, ò <lb/>altro liquido, che sfumi (il qual fumo non credo ſia altro <lb/>che li efluui, che eſcono dal liquido,) ò con la mano, ò cor <lb/>qualche inſtrumento; </s>
  <s xml:id="echoid-s2851" xml:space="preserve">ſi vede vſcir il fumo in maggior co <lb/>pia; </s>
  <s xml:id="echoid-s2852" xml:space="preserve">credo non per altro, fe non per la facilità, che arreca l’ <lb/>agitatione all’eua poratione. </s>
  <s xml:id="echoid-s2853" xml:space="preserve">E queſta credo io che ſia vna <lb/>delle cagioni, per le quali ſogliamo agitar il brodo, ò mine <lb/>ſtra con il cucchiaro quando vogliamo che preſto raffredi <lb/>po iche quell’agitatione facilita l’vſcita alle particelle più <lb/>calide, e più pronte al moto; </s>
  <s xml:id="echoid-s2854" xml:space="preserve">le quali partite, laſciano nella <lb/>mineſtra vn caldo da noi tolerabile. </s>
  <s xml:id="echoid-s2855" xml:space="preserve">Stando le qualicoſe, non <lb/>mi reſta dubio, che anco dal mercurio agitato non debbanco <lb/>vſcir efluui, mentre eſſo contiene quantità d’acqua ele-<lb/>mentare, la quale facilmente potrà da eſſo euaporare.</s>
  <s xml:id="echoid-s2856" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2857" xml:space="preserve">_Cont_. </s>
  <s xml:id="echoid-s2858" xml:space="preserve">Acqua elementare?</s>
  <s xml:id="echoid-s2859" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2860" xml:space="preserve">_Ofr_. </s>
  <s xml:id="echoid-s2861" xml:space="preserve">Sì Signore. </s>
  <s xml:id="echoid-s2862" xml:space="preserve">E ſe vuoie imparar ciò, veda I’opuſculo, il ti <lb/>tolo del quale è, _Noua, &amp; </s>
  <s xml:id="echoid-s2863" xml:space="preserve">Amenior Philoſophia de Fontibus:_</s>
  <s xml:id="echoid-s2864" xml:space="preserve">
<pb o="7" file="00101" n="101" rhead="TERZO."/>
_Iacobi Dobrzenſki de Nigroponte, Boemi Pragenſis par._ </s>
  <s xml:id="echoid-s2865" xml:space="preserve">I. </s>
  <s xml:id="echoid-s2866" xml:space="preserve">_pag. </s>
  <s xml:id="echoid-s2867" xml:space="preserve">27._ <lb/></s>
  <s xml:id="echoid-s2868" xml:space="preserve">e trouerà vna belliſſima eſperiẽza di ciò. </s>
  <s xml:id="echoid-s2869" xml:space="preserve">Dice adunque che <lb/>ſe ſi ponerà in vn lambico proportionato libbre 6. </s>
  <s xml:id="echoid-s2870" xml:space="preserve">di mer-<lb/>curio in circa, e ſe diſtillerà, che ne vſciranno 3. </s>
  <s xml:id="echoid-s2871" xml:space="preserve">ouero 4 on-<lb/>cie d’acqua puriſſima, &amp; </s>
  <s xml:id="echoid-s2872" xml:space="preserve">elementare.</s>
  <s xml:id="echoid-s2873" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2874" xml:space="preserve">_Cont._ </s>
  <s xml:id="echoid-s2875" xml:space="preserve">Io non dico, che mediante la diſtillatione, non ſi poſſino <lb/>cauar ſpiriti dal mercurio, che raccolti, conſtituiſcono vn <lb/>fluido come acqua; </s>
  <s xml:id="echoid-s2876" xml:space="preserve">mà che queſto poi ſia acqua elemen-<lb/>tare, io non ſono coſi pronto à crederlo: </s>
  <s xml:id="echoid-s2877" xml:space="preserve">poiche più toſto <lb/>li reputarei vn eſtratto efficace di mercurio, che riteneſſe <lb/>le ſue virtù efficacemente, appunto come quando dal <lb/>vino ſe ne caua l’acquauita; </s>
  <s xml:id="echoid-s2878" xml:space="preserve">e da altre materie altri <lb/>eſtratti.</s>
  <s xml:id="echoid-s2879" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2880" xml:space="preserve">_Ofr._ </s>
  <s xml:id="echoid-s2881" xml:space="preserve">Quello, che ſi caua dal mercurio non eſſer altro che ac-<lb/>qua elementare, è prouaro dal medemo autore con queſt’-<lb/>eſperienza. </s>
  <s xml:id="echoid-s2882" xml:space="preserve">Eſtratta l’acqua dal mercurio, s’eſponga que-<lb/>ſto all’aria per tempo conueniente, e poi ſi lambichi di <lb/>nuouo; </s>
  <s xml:id="echoid-s2883" xml:space="preserve">ſe ne cauerà altretanta acqua. </s>
  <s xml:id="echoid-s2884" xml:space="preserve">Si replichi que ſt’-<lb/>operatione ſei, otto, e quante volte ſi vuole, ſempre ſe ne <lb/>cauerà la medema acqua. </s>
  <s xml:id="echoid-s2885" xml:space="preserve">Sicche peſata tutta queſt’acqua <lb/>raccolta, ſi trouerà peſare più che non peſaua l’argentoui-<lb/>uo. </s>
  <s xml:id="echoid-s2886" xml:space="preserve">Ragioneuolmente adunque interroga l’autore. </s>
  <s xml:id="echoid-s2887" xml:space="preserve">_Vide an_ <lb/>_Hic ſpiritus mercurij eſſe poſsit?_ </s>
  <s xml:id="echoid-s2888" xml:space="preserve">Poi ſoggiunge. </s>
  <s xml:id="echoid-s2889" xml:space="preserve">_Ergò liberè di-_ <lb/>_cere poſſum aquam illam nil aliud eſſe, quam atomos aqueas in aere_ <lb/>_circumuolitantes, tempore bumido ab argentouiuo eidem expoſito_ <lb/>_attractas, &amp; </s>
  <s xml:id="echoid-s2890" xml:space="preserve">frigiditate naturæ argentiuiui intrò conſeruatas, po-_ <lb/>_ſteaque ope diſtillationis in aquam formalem conuerſas_.</s>
  <s xml:id="echoid-s2891" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2892" xml:space="preserve">_Mat._ </s>
  <s xml:id="echoid-s2893" xml:space="preserve">Pare à me che più congruamente aſſegni la cauſa de ſi-<lb/>mili effetti il dottiſſimo Padre Emanuel Magnano _in Phi-_ <lb/>_loſ. </s>
  <s xml:id="echoid-s2894" xml:space="preserve">naturæ cap_. </s>
  <s xml:id="echoid-s2895" xml:space="preserve">16. </s>
  <s xml:id="echoid-s2896" xml:space="preserve">_prop_. </s>
  <s xml:id="echoid-s2897" xml:space="preserve">2. </s>
  <s xml:id="echoid-s2898" xml:space="preserve">oue dice, che ſe eſtratto il ſpirito <lb/>dal vitriolo, s’eſponga all’aria per alcuni giorni quella ma-<lb/>teria, che reſta, la quale dalli artefici è chiamata Colcotar, <lb/>e ſe torni à diſtillare con la retorta, che ſe ne cauerà nuo-<lb/>uo, e più efficace ſpirito. </s>
  <s xml:id="echoid-s2899" xml:space="preserve">E il medemo ſuccederà ſe più <lb/>volte ſe replicherà l’operatione. </s>
  <s xml:id="echoid-s2900" xml:space="preserve">Così ſe quella terra, dal-<lb/>la quale con vari lauamenti ſe ne hà cauato il nitro, ſi eſpo-<lb/>nerà in luogo conueniente per alquanto tempo, lauata di <lb/>nuouo, ſe ne cauerà altro nitro. </s>
  <s xml:id="echoid-s2901" xml:space="preserve">La cauſa è, dice egli, per-
<pb o="8" file="00102" n="102" rhead="DIALOGO"/>
che li ſpiriti del vitriolo, e del nitro vaganti per l’aria, v-<lb/>ſciti da corpi nitroſi, e vitriolati, di nuouo entrano, e s’at-<lb/>taccano al ſuo fiſſo, cioè al colcotare, e alla terra. </s>
  <s xml:id="echoid-s2902" xml:space="preserve">Così io <lb/>direi, che vſcẽdo dall’argentouiuo, e da gl’altri corpi efluui, <lb/>e ſpiriti d’argentouiuo, queſti s’vniſſero al ſuo fiſſo, e l’im-<lb/>pregnaſſero di nuouo Hò detto, _e da altri corpi_, perche bi-<lb/>ſogna che pur queſti, ò per meglio dire alcuni d’eſſi con-<lb/>tenghino in ſe corpuſcoli ſimili à quelli, che compongo-<lb/>no l’argentouiuo, ſe è vero quanto vna volta mi diſſe vn <lb/>Chimico. </s>
  <s xml:id="echoid-s2903" xml:space="preserve">Mi moſtrò queſti vn’ampollinetta, ò bottonci-<lb/>no di vetro con certo mercurio, che mi diceua hauerlo eſ-<lb/>tratto dal ſterco d’huomo. </s>
  <s xml:id="echoid-s2904" xml:space="preserve">Io laſcio la verità di queſto al <lb/>ſuo luogo.</s>
  <s xml:id="echoid-s2905" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2906" xml:space="preserve">_Cont_. </s>
  <s xml:id="echoid-s2907" xml:space="preserve">La cauſa di queſto Fenomeno da V. </s>
  <s xml:id="echoid-s2908" xml:space="preserve">S. </s>
  <s xml:id="echoid-s2909" xml:space="preserve">aſſegnata mi piace <lb/>più, che quella, che n’aſſegna il Sig. </s>
  <s xml:id="echoid-s2910" xml:space="preserve">Dobrzenski. </s>
  <s xml:id="echoid-s2911" xml:space="preserve">Nulladi-<lb/>meno l’eſperienza ne potrà render più fondati nel deter-<lb/>minare che materia ſia queſta, dalla qualità, &amp; </s>
  <s xml:id="echoid-s2912" xml:space="preserve">effetti, che <lb/>cagionerà quell’acqua ſtillata.</s>
  <s xml:id="echoid-s2913" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2914" xml:space="preserve">_Mat._ </s>
  <s xml:id="echoid-s2915" xml:space="preserve">Sì, che per altro non tengo ne meno io per verità infal-<lb/>libile, e ſempre vero, che li corpuſcoli, che entrano in vn <lb/>miſto, ſiano quelli da eſſo vſciti, e della medema natura. <lb/></s>
  <s xml:id="echoid-s2916" xml:space="preserve">con eſſo.</s>
  <s xml:id="echoid-s2917" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2918" xml:space="preserve">_Ofr._ </s>
  <s xml:id="echoid-s2919" xml:space="preserve">Io vorrei ſapere il modo, con il quale queſti corpuſco-<lb/>letti entrino nell’argentouiuo, e nelli altri corpi; </s>
  <s xml:id="echoid-s2920" xml:space="preserve">perche <lb/>quel dire, che ſiano attratti delli predetti autori non mi <lb/>piace.</s>
  <s xml:id="echoid-s2921" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2922" xml:space="preserve">_Mat._ </s>
  <s xml:id="echoid-s2923" xml:space="preserve">Ne meno piace à mè. </s>
  <s xml:id="echoid-s2924" xml:space="preserve">Io credo che queſto effetto non ſia <lb/>altro, che vno di quelli, che cagiona la preſſione, Elaterio, <lb/>e grauità dell’aria, che è il principal ſoggetto, che hauemo <lb/>per le mani in queſti noſtri diſcorſi. </s>
  <s xml:id="echoid-s2925" xml:space="preserve">E per dichiarar queſto <lb/>li darò vna ſimilitudine aſſai roza. </s>
  <s xml:id="echoid-s2926" xml:space="preserve">V. </s>
  <s xml:id="echoid-s2927" xml:space="preserve">S. </s>
  <s xml:id="echoid-s2928" xml:space="preserve">riem pia vn criuello <lb/>(che habbia li ſuoi bucchi coſi formati, che ſiano della me-<lb/>dema figura, e grandezza delli grani del ſorgo roſſo) di <lb/>molte ſorti di biade; </s>
  <s xml:id="echoid-s2929" xml:space="preserve">premendo queſte con la loro graui-<lb/>tà ſopra il criuello, caccieranno per li ſuoi bucchi e grani <lb/>di ſorgo roſſo, e grani di miglio, e di tutte quelle ſorti di <lb/>biade, che haueranno li grani più piccoli di quelli del ſor-<lb/>go roſſo, ma non delli maggiori. </s>
  <s xml:id="echoid-s2930" xml:space="preserve">Così ſe foſſero minori
<pb o="9" file="00103" n="103" rhead="TERZO"/>
per vn capo, ma maggiori per l’altro, non vi potrebbero <lb/>diſcendere quando non principiaſſero ad entrarui per il <lb/>verſo che ſono minori. </s>
  <s xml:id="echoid-s2931" xml:space="preserve">Che ſe occupato qualche bucco <lb/>da grano maggiore come ſarebbe il Cece, Faua, ò altro che <lb/>impediſse l’ingreſſo alli minori, con la mano, ò altro agi-<lb/>taſſimo queſti grani, potreſſimo rimuouer quel maggiore, <lb/>di modo che capitaſſero delli minori al bucco, e così di-<lb/>ſcendeſſero. </s>
  <s xml:id="echoid-s2932" xml:space="preserve">Tanto credo io che in certo modo ſucceda. <lb/></s>
  <s xml:id="echoid-s2933" xml:space="preserve">nel noſtro caſo. </s>
  <s xml:id="echoid-s2934" xml:space="preserve">Preme l’aria noſtra ſopra la ſuperficie dell’ <lb/>argentouiuo, e delli corpi predetti con la ſua grauità, &amp; </s>
  <s xml:id="echoid-s2935" xml:space="preserve"><lb/>elatere; </s>
  <s xml:id="echoid-s2936" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s2937" xml:space="preserve">eſſendo queſta vn’aggregato delli efluui, che <lb/>ſono vſciti da tutti li corpi; </s>
  <s xml:id="echoid-s2938" xml:space="preserve">e perciò formati in diuerſiſſime <lb/>maniere; </s>
  <s xml:id="echoid-s2939" xml:space="preserve">e trà l’infinite particelle componenti il mercurio, <lb/>e detti corpi, eſſendoui infiniti ſpatietti, e pori ſe non vacui, <lb/>almeno pieni di materia ſottiliſſima, figurati conforme ri-<lb/>chiede la diuerſa diſpoſitione delle minime particelle com-<lb/>ponenti; </s>
  <s xml:id="echoid-s2940" xml:space="preserve">con quella preſſione, &amp; </s>
  <s xml:id="echoid-s2941" xml:space="preserve">elatere caccia in quelli <lb/>pori, ò ſpatietti quelli ſuoi corpuſcoli, li quali ſono per la <lb/>ſua figura, e piccolezza capaci ad entrarui. </s>
  <s xml:id="echoid-s2942" xml:space="preserve">Al che mira-<lb/>bilmente ſerue il continuo moto, nel quale è l’aria noſtra, <lb/>ò agitata da venti, ò da altro, per rimuouer li più groſſi im-<lb/>pedienti l’ ingreſſo alli altri, e portarui li proportionati. </s>
  <s xml:id="echoid-s2943" xml:space="preserve"><lb/>La ragione perſuade che quelli ve rientrino per lo più, li <lb/>quali ò per agitatione, ò per altra cauſa vi ſono vſciti, eſſen-<lb/>do proportionati à quelli ſpatietti; </s>
  <s xml:id="echoid-s2944" xml:space="preserve">e parimente che vi en-<lb/>trino quelli, che ſono vguali, e ſimili à queſti. </s>
  <s xml:id="echoid-s2945" xml:space="preserve">Che ſe ve <lb/>ne ſono anco de minori; </s>
  <s xml:id="echoid-s2946" xml:space="preserve">e queſti pure poſſino eſſer cacciati <lb/>dentro. </s>
  <s xml:id="echoid-s2947" xml:space="preserve">Agiuta anco queſt’ingreſſo la teſſitura del corpo, <lb/>nel quale queſti deuono entrare: </s>
  <s xml:id="echoid-s2948" xml:space="preserve">perche eſſendo eſſo flui-<lb/>do, come è il mercurio, &amp; </s>
  <s xml:id="echoid-s2949" xml:space="preserve">in conſequenza conſtante di <lb/>particelle minime, e prontiſſime al moto, &amp; </s>
  <s xml:id="echoid-s2950" xml:space="preserve">alla ſe paratio-<lb/>ne; </s>
  <s xml:id="echoid-s2951" xml:space="preserve">le particelle dell’ aria ſe pono far più largo all’ entrarui <lb/>con la preſſione, grauità, &amp; </s>
  <s xml:id="echoid-s2952" xml:space="preserve">elatere.</s>
  <s xml:id="echoid-s2953" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2954" xml:space="preserve">_fre_. </s>
  <s xml:id="echoid-s2955" xml:space="preserve">In queſto modo li corpuſcoli dell’a ria entrarebbero ſola-<lb/>mente nelle prime parti del mercurio, e delli corpi à ſe con-<lb/>tigue, e non per tutta la corpulenza. </s>
  <s xml:id="echoid-s2956" xml:space="preserve">Per eſempio, ſe il <lb/>mercurio foſſe alto nel vaſo vn cubito, entrarebbero ſola-<lb/>mente nelle ſue parti ſuperficiali, e non per tutta la ſua al-
<pb o="10" file="00104" n="104" rhead="DIALOGO"/>
tezza. </s>
  <s xml:id="echoid-s2957" xml:space="preserve">Perche occupati quelli primi ſpatietti, ò pori dalli <lb/>corpuſcoli dell’aria, impedirebbono l’ingreſſo alli altri; </s>
  <s xml:id="echoid-s2958" xml:space="preserve">ne <lb/>eſſi ſe cacciarebbero più oltre.</s>
  <s xml:id="echoid-s2959" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2960" xml:space="preserve">_Mat._ </s>
  <s xml:id="echoid-s2961" xml:space="preserve">Biſogna Sig. </s>
  <s xml:id="echoid-s2962" xml:space="preserve">Ofredi che V. </s>
  <s xml:id="echoid-s2963" xml:space="preserve">S. </s>
  <s xml:id="echoid-s2964" xml:space="preserve">ſia ſcordata di quel volgar <lb/>prouerbio, che vn Chiodo caccia l’altro. </s>
  <s xml:id="echoid-s2965" xml:space="preserve">Quando li noſtri <lb/>Marangoni vogliono cacciare vn chiodo ben bene dentro <lb/>il legno, percuotono con il martello vn’ altro chiodo, che <lb/>s’appoggia ſopra l’immerſo nel legno. </s>
  <s xml:id="echoid-s2966" xml:space="preserve">Così l’aria, caccia-<lb/>to che hà vn corpuſcolo in qualche ſpatietto vicino alla. <lb/></s>
  <s xml:id="echoid-s2967" xml:space="preserve">ſuperficie, preme con’ vn altro ſopra quello, e lo caccia più <lb/>in dentro; </s>
  <s xml:id="echoid-s2968" xml:space="preserve">e poi con’vn altro; </s>
  <s xml:id="echoid-s2969" xml:space="preserve">e così ſucceſſiuamente ſin@ <lb/>che li caccia quanto puole.</s>
  <s xml:id="echoid-s2970" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2971" xml:space="preserve">_Ofr._ </s>
  <s xml:id="echoid-s2972" xml:space="preserve">Queſte ragioni non mi paiono affatto priue d’apparenza <lb/>Se in vn vaſo di legno poneremo dell’ acqua, le particelle <lb/>di queſta cacciate dalla preſſione, e grauità, che fà l’acqu@ <lb/>con la ſopraſtãte aria ſopra il vaſo, penetreranno nelli ſuc@ <lb/>pori, ſe queſti ne ſaranno capaci. </s>
  <s xml:id="echoid-s2973" xml:space="preserve">Mà ſe il legno foſſe me <lb/>no poroſo, cioè di pori più anguſti, li minimi dell’ acqua <lb/>non v’entraranno; </s>
  <s xml:id="echoid-s2974" xml:space="preserve">ma bene chi vi poneſſe altro liquido, <gap/> <lb/>cui minime particelle foſſero, e minori, e ſimili in figura <lb/>alli pori del legno, queſte v’entrariano.</s>
  <s xml:id="echoid-s2975" xml:space="preserve"/>
</p>
<p style="it">
  <s xml:id="echoid-s2976" xml:space="preserve">Cont. </s>
  <s xml:id="echoid-s2977" xml:space="preserve">_Queſt’effetto, ò eſperienza ne deue render cauti co@_ <lb/>_quanta circonſpettione biſogni caminare nel creder all’e@_ <lb/>_perienze arrecate da gl’autori. </s>
  <s xml:id="echoid-s2978" xml:space="preserve">Poiche in ſimil propoſit_ <lb/>_hieri appunto mi fù detto hauer il Ruelio_ De Plantis capi. <lb/></s>
  <s xml:id="echoid-s2979" xml:space="preserve">Hedera _queſte parole._ </s>
  <s xml:id="echoid-s2980" xml:space="preserve">Nobis Caio documentum libello de re ru<gap/> <lb/>ca dedit. </s>
  <s xml:id="echoid-s2981" xml:space="preserve">Si voles, inquit, ſcire in vinum aqua addita ſit vel nè: </s>
  <s xml:id="echoid-s2982" xml:space="preserve">v<gap/> <lb/>ſculum facito de materia Hederacea, vinum quod putabis aqu<gap/> <lb/>habere eodem mittito, ſi dilutum aqua fuerit, vinum efluet, aqu<gap/> <lb/>manebit nam non continet vinum vas Hederaceum. </s>
  <s xml:id="echoid-s2983" xml:space="preserve">_Per cont<gap/>_ <lb/>_rio, il dottiſſimo P. </s>
  <s xml:id="echoid-s2984" xml:space="preserve">Franceſco Maria Grimaldi Gieſuita <gap/>_ <lb/>ſuo trattato de Lumine prop. </s>
  <s xml:id="echoid-s2985" xml:space="preserve">6. </s>
  <s xml:id="echoid-s2986" xml:space="preserve">n. </s>
  <s xml:id="echoid-s2987" xml:space="preserve">2. </s>
  <s xml:id="echoid-s2988" xml:space="preserve">dice, _E_xperimentum, quo ce<gap/> <lb/>ſcimus ſeparari vinum ab aqua, ſi utrumque ſimul poſitum fue<gap/> <lb/>in vaſe ex lig@o Hederaceo, quia ſcilicet aqua peruadit craſsiti<gap/> <lb/>talis vaſis, &amp; </s>
  <s xml:id="echoid-s2989" xml:space="preserve">per illud ſtillatim defluit, vinum autem remane <lb/>vaſe, &amp;</s>
  <s xml:id="echoid-s2990" xml:space="preserve">c.</s>
  <s xml:id="echoid-s2991" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s2992" xml:space="preserve">_Mat._ </s>
  <s xml:id="echoid-s2993" xml:space="preserve">Pur troppo ſi leggono di ſimili ſtrauaganze, e contra<gap/> <lb/>tioni nelli autori. </s>
  <s xml:id="echoid-s2994" xml:space="preserve">Prima del P. </s>
  <s xml:id="echoid-s2995" xml:space="preserve">Grimaldi diſſe ciò anc<gap/>
<pb o="11" file="00105" n="105" rhead="TERZO."/>
dottiſſimo Gio. </s>
  <s xml:id="echoid-s2996" xml:space="preserve">Battiſta Porta _Magiæ nat. </s>
  <s xml:id="echoid-s2997" xml:space="preserve">lib. </s>
  <s xml:id="echoid-s2998" xml:space="preserve">18. </s>
  <s xml:id="echoid-s2999" xml:space="preserve">cap._ </s>
  <s xml:id="echoid-s3000" xml:space="preserve">4. </s>
  <s xml:id="echoid-s3001" xml:space="preserve">oue <lb/>porta anco la ragione perche debba vſcir l’acqua, e non il <lb/>vino. </s>
  <s xml:id="echoid-s3002" xml:space="preserve">_Nam aqua humorum omnium ſubtiliſsima est, quia ſimplex_ <lb/>_est, vinum autem quum color atum ſit, &amp; </s>
  <s xml:id="echoid-s3003" xml:space="preserve">color ex mixtione elemen-_ <lb/>_torum, corpulentum magis eſt._ </s>
  <s xml:id="echoid-s3004" xml:space="preserve">Dice che queſta eſperienza ſi <lb/>può fare cõ molti legni, &amp; </s>
  <s xml:id="echoid-s3005" xml:space="preserve">in queſto hauer fallato li antichi, <lb/>che penſorno con l’hedera ſola. </s>
  <s xml:id="echoid-s3006" xml:space="preserve">Narra le medeme parole <lb/>che riferiſce anco il Ruelio, ma dice dirle _Gæto_, che io non <lb/>sò chi ſia, e può eſſer error di ſtampa; </s>
  <s xml:id="echoid-s3007" xml:space="preserve">il medemo dice hauer <lb/>detto Plinio, e dice hauer errato ambidue, e tutti li antichi, <lb/>e moderni. </s>
  <s xml:id="echoid-s3008" xml:space="preserve">Inſegna anco altri artificij ſimili de Democri-<lb/>to &amp; </s>
  <s xml:id="echoid-s3009" xml:space="preserve">Africano. </s>
  <s xml:id="echoid-s3010" xml:space="preserve">Sia però come ſi vuole; </s>
  <s xml:id="echoid-s3011" xml:space="preserve">baſta al noſtro <lb/>propoſito che li minimi dell’vno, e non dell’altro eſchino. <lb/></s>
  <s xml:id="echoid-s3012" xml:space="preserve">E quando anco ciò non ſuccedeſſe in queſto caſo, come io <lb/>ne dubito, poco importarebbe, e nulla derrogarebbe à quã. </s>
  <s xml:id="echoid-s3013" xml:space="preserve"><lb/>to habbiamo detto. </s>
  <s xml:id="echoid-s3014" xml:space="preserve">Già molti anni, ritrouandomi à Tiuo-<lb/>li, feci far da vn Tornitore vna ſcudella d’Hedera. </s>
  <s xml:id="echoid-s3015" xml:space="preserve">Nel farl’ <lb/>eſperienza non reſtai ſodisfatto. </s>
  <s xml:id="echoid-s3016" xml:space="preserve">Eben vero, che poco mi <lb/>potei ſeruir di detta ſcudella per certi accidenti Mi pare, ſe <lb/>bene m’arrecordo, che vſciſſero, e particelle di vi@o, e d’a@-<lb/>qua; </s>
  <s xml:id="echoid-s3017" xml:space="preserve">e che quello, che rimaſe nella ſcudella foſſe coſa mol-<lb/>to inſipida. </s>
  <s xml:id="echoid-s3018" xml:space="preserve">Coſi può eſſere che ſucceda. </s>
  <s xml:id="echoid-s3019" xml:space="preserve">Li mimimi del <lb/>vino, &amp; </s>
  <s xml:id="echoid-s3020" xml:space="preserve">acqua ſe vniſcono, e meſcolano facilmente; </s>
  <s xml:id="echoid-s3021" xml:space="preserve">ilche <lb/>indica che ſiano aſſai ſimili in figura. </s>
  <s xml:id="echoid-s3022" xml:space="preserve">Può eſſer adunque <lb/>che eſchino le parti più ſottili di ambidue, queſti liquidi, è <lb/>reſtino le più craſſe. </s>
  <s xml:id="echoid-s3023" xml:space="preserve">Mà doue ſe ſiamo laſciati guidare dal <lb/>diſcorſo? </s>
  <s xml:id="echoid-s3024" xml:space="preserve">Ritorniamo adunque al noſtro principal inten-<lb/>to, e d’onde ſopra ſi ſiamo partiti, e diciamo pure non eſſer <lb/>merauiglia, ſe contenendo il mercurio tanta copia di ma-<lb/>teria euaporabile, che con l’agitatione ſe gli faciliti l’vſci-<lb/>ta; </s>
  <s xml:id="echoid-s3025" xml:space="preserve">e che in conſeguenza l’agitatione del Baroſcopio foſſe <lb/>cagione del Fenomeno del Sig Sinclaro, del quale ſopra <lb/>parlauamo.</s>
  <s xml:id="echoid-s3026" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3027" xml:space="preserve">_Ofr_ Prima però m’appello della ſentenza del Porta, che l’ac-<lb/>qua _humorum omnium ſubtiliſsima ſit_. </s>
  <s xml:id="echoid-s3028" xml:space="preserve">L’acquauita, e quinte <lb/>eſſenze de fiori, &amp; </s>
  <s xml:id="echoid-s3029" xml:space="preserve">altro appena poſſono conſeruarſi in vaſi <lb/>di vetro. </s>
  <s xml:id="echoid-s3030" xml:space="preserve">Chi richiudeſſe queſti in vn vaſo d’Hedera, ò d’vno <lb/>di queſti ſuoi legni, ne far ebbe vna buona mercantia; </s>
  <s xml:id="echoid-s3031" xml:space="preserve">per-
<pb o="12" file="00106" n="106" rhead="DIALOGO"/>
che in poco tempo non trouarebbe che vendere. </s>
  <s xml:id="echoid-s3032" xml:space="preserve">Ritornan-<lb/>do poi al noſtro propoſito, dico così.</s>
  <s xml:id="echoid-s3033" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3034" xml:space="preserve">_Cont_. </s>
  <s xml:id="echoid-s3035" xml:space="preserve">In gratia mi laſci digredire ancora vn poco. </s>
  <s xml:id="echoid-s3036" xml:space="preserve">Mentre non <lb/>è proprietà dell’ hedera ſola di eſſer accomodata à queſt a <lb/>eſperienza, ma di molti altri legni, come dice il Porta; </s>
  <s xml:id="echoid-s3037" xml:space="preserve">e <lb/>poi vi è deſſidio trà li autori ſe eſchi il ſolo vino, ò acqua, <lb/>ò pure le parti più ſottili d’ambidue, come dubito io, re-<lb/>ſtando le più fezzoſe, e craſſe; </s>
  <s xml:id="echoid-s3038" xml:space="preserve">giudico bene ſuggerir vn <lb/>modo, che mi par più ſicuro per venir in cognitione di que-<lb/>ſto. </s>
  <s xml:id="echoid-s3039" xml:space="preserve">Li Signori Accademici Fiorentini, _nelli ſaggi citati pag._ <lb/></s>
  <s xml:id="echoid-s3040" xml:space="preserve">204. </s>
  <s xml:id="echoid-s3041" xml:space="preserve">dicono che fecero gettare vna gran palla d’argento aſ-<lb/>ſai ſottile, e la riempirono d’acqua raffreddata con il ghiac-<lb/>cio, e la ſerrorono ſaldiſſimamente con vite; </s>
  <s xml:id="echoid-s3042" xml:space="preserve">e martellan-<lb/>dola, &amp; </s>
  <s xml:id="echoid-s3043" xml:space="preserve">ammaccandola gentilmente, ad ogni martellata, ò <lb/>ammaccatura videro traſudare gocciole d’ acqua per li <lb/>pori dell’argento. </s>
  <s xml:id="echoid-s3044" xml:space="preserve">Hora queſti pori ſono aſſai più anguſti <lb/>che quelli dell’hedera, &amp; </s>
  <s xml:id="echoid-s3045" xml:space="preserve">altri legni; </s>
  <s xml:id="echoid-s3046" xml:space="preserve">mentre per li pori dell’ <lb/>argento non traſuderia ne vino, ne acqua, quando la palla <lb/>non foſſe martellata, e per quelli delli legni eſcono libera-<lb/>mente; </s>
  <s xml:id="echoid-s3047" xml:space="preserve">adunque tanto più ſottili biſogna che ſiino le parti <lb/>di quel liquido, che douerà vſcire per queſti pori. </s>
  <s xml:id="echoid-s3048" xml:space="preserve">Vna ſimil <lb/>palla ſi riempia di vino acquato, e ſi martelli, &amp; </s>
  <s xml:id="echoid-s3049" xml:space="preserve">ammacchi, <lb/>e s’oſſerui quello n’vſcirà. </s>
  <s xml:id="echoid-s3050" xml:space="preserve">Io tengo di certo che non vſci-<lb/>ranno, ne acqua, ne vino puro, ma le parti più ſottili del <lb/>medemo miſto. </s>
  <s xml:id="echoid-s3051" xml:space="preserve">Ritorni Signor Ofredi nella noſtra car-<lb/>riera.</s>
  <s xml:id="echoid-s3052" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3053" xml:space="preserve">_Ofr_. </s>
  <s xml:id="echoid-s3054" xml:space="preserve">Se l’agitatione del mercurio cagionaſfe l’vſcità di queſti <lb/>efluui, tanto ſempre douerebbe ſucceder _toties &amp; </s>
  <s xml:id="echoid-s3055" xml:space="preserve">quoties_ l’-<lb/>argentouiuo s’equilibra. </s>
  <s xml:id="echoid-s3056" xml:space="preserve">Mi dichiaro. </s>
  <s xml:id="echoid-s3057" xml:space="preserve">Riempita la fiſto-<lb/>la eccedente li diti 29. </s>
  <s xml:id="echoid-s3058" xml:space="preserve">di mercurio, &amp; </s>
  <s xml:id="echoid-s3059" xml:space="preserve">immerſa la bocca a-<lb/>perta nel mercurio ſtagnante del vaſo, diſcende il mercurio <lb/>notabilmente più delli diti 29. </s>
  <s xml:id="echoid-s3060" xml:space="preserve">e di nuouo è riſpinto all’insù <lb/>ſopra di eſſi; </s>
  <s xml:id="echoid-s3061" xml:space="preserve">e fatti diuerſi ſaliſcendere, finalmente s’equi-<lb/>libra alli diti 29. </s>
  <s xml:id="echoid-s3062" xml:space="preserve">che ſe di nuouo, ò inclinando la canna, ò <lb/>in altra forma ſi faceſſe aſcender più, e di nuouo ſi riduceſ-<lb/>ſe al ſito perpendicolare; </s>
  <s xml:id="echoid-s3063" xml:space="preserve">di nuouo ſi farebbero queſti di-<lb/>uerſi ſaliſcendere; </s>
  <s xml:id="echoid-s3064" xml:space="preserve">e finalmente ſempre ſi ridurebbe alli di-<lb/>ti 29. </s>
  <s xml:id="echoid-s3065" xml:space="preserve">Hora quì ſi fanno agitationi molto conſiderabili del
<pb o="13" file="00107" n="107" rhead="TERZO."/>
mercurio; </s>
  <s xml:id="echoid-s3066" xml:space="preserve">e pure non eſcono queſti efluui, e non cagiona-<lb/>no queſte differenze</s>
</p>
<p>
  <s xml:id="echoid-s3067" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s3068" xml:space="preserve">Se l’eſperienze del Signor Sinclaro ſono vere; </s>
  <s xml:id="echoid-s3069" xml:space="preserve">e d’eſſe n’è <lb/>cagione la ſalita dell’aria; </s>
  <s xml:id="echoid-s3070" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s3071" xml:space="preserve">in queſto ſecondo caſo il mer-<lb/>curio ſaliſce ſempre alla medema altezza, biſogneria dire, <lb/>che vi foſſe differenza trà quelle agitationi, e queſte. </s>
  <s xml:id="echoid-s3072" xml:space="preserve">Ne <lb/>io ſaprei altra trouarne, ſe non che in queſta ſeconda agita-<lb/>tione non ſi dà ſcoſſa alcuna al mercurio, mà nella prima sì. <lb/></s>
  <s xml:id="echoid-s3073" xml:space="preserve">Nel diſcender dal monte non è poſſibile che non ſcuotia-<lb/>mo il noſtro corpo; </s>
  <s xml:id="echoid-s3074" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s3075" xml:space="preserve">in conſeguenza il mercurio; </s>
  <s xml:id="echoid-s3076" xml:space="preserve">con le <lb/>quali ſcoſſe molto queſto ſi concute; </s>
  <s xml:id="echoid-s3077" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s3078" xml:space="preserve">in conſeguenza <lb/>molto ſi facilita l’vſcita alli efluui.</s>
  <s xml:id="echoid-s3079" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3080" xml:space="preserve">_Ofr_. </s>
  <s xml:id="echoid-s3081" xml:space="preserve">Parmi che per ſaluare il Fenomeno del Signor Sinclaro, <lb/>habbia V. </s>
  <s xml:id="echoid-s3082" xml:space="preserve">S. </s>
  <s xml:id="echoid-s3083" xml:space="preserve">trouato vn debole ſutterfugio; </s>
  <s xml:id="echoid-s3084" xml:space="preserve">poiche che gra-<lb/>uità può hauere quel pochino d’aria, che ſi ſuppone volare <lb/>ſopra il mercurio della canna, che l’habbia da deprimere <lb/>tanto, che con gli occhi conoſciamo euidentemente que-<lb/>ſta depreſſione?</s>
  <s xml:id="echoid-s3085" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3086" xml:space="preserve">_Cont_. </s>
  <s xml:id="echoid-s3087" xml:space="preserve">In gratia Sig. </s>
  <s xml:id="echoid-s3088" xml:space="preserve">Profeſſore prima che V. </s>
  <s xml:id="echoid-s3089" xml:space="preserve">S. </s>
  <s xml:id="echoid-s3090" xml:space="preserve">riſponda al Sig. <lb/></s>
  <s xml:id="echoid-s3091" xml:space="preserve">Ofredi, laſci che arrechi vn’eſperienza del medemo Signor <lb/>Sinclaro regiſtra ta _nel lib. </s>
  <s xml:id="echoid-s3092" xml:space="preserve">6. </s>
  <s xml:id="echoid-s3093" xml:space="preserve">dial. </s>
  <s xml:id="echoid-s3094" xml:space="preserve">1. </s>
  <s xml:id="echoid-s3095" xml:space="preserve">n. </s>
  <s xml:id="echoid-s3096" xml:space="preserve">4._ </s>
  <s xml:id="echoid-s3097" xml:space="preserve">Nella sferetta di vetro <lb/>piccola quanto ſi vuole, ſi fà paſſare il cannello di vetro <lb/>B A, a perto da ambi le parti, il quale ſia più lungo delli diti <lb/>29. </s>
  <s xml:id="echoid-s3098" xml:space="preserve">altezza, alla quale s’equilibra ordinariamente il mercu-<lb/>rio, e fi ſtuca in C, beniſſimo; </s>
  <s xml:id="echoid-s3099" xml:space="preserve">al diſotto ſe gli ſalda pure al-<lb/>tro tubo LK, a perto d’ambi le parti, che entri in eſſa, e che <lb/>habbia il ſito come nella figura; </s>
  <s xml:id="echoid-s3100" xml:space="preserve">il quale però ſia coſi lun-<lb/>go, che MN, ſia diti 29. </s>
  <s xml:id="echoid-s3101" xml:space="preserve">Otturata la bocca K eſquiſita men-<lb/>te, per l’altra bocca B, s’infonda argentouiuo ſino che ſia <lb/>pieno ogni coſa, cioè il tubo BA, la sfera, e il tubo LK. </s>
  <s xml:id="echoid-s3102" xml:space="preserve">Ot-<lb/>turato poi eſquiſitamente come, e con quella materia, che <lb/>ſi ſuole la bocca B, s’immerga la K, nel mercurio del vaſo <lb/>ſtagnante, come appare nella figura, e s’apra la detta bocca <lb/>K. </s>
  <s xml:id="echoid-s3103" xml:space="preserve">Vedraſſi diſcender il mercurio come ne la figura, di mo-<lb/>do che ſe MN, ſarà diti 29. </s>
  <s xml:id="echoid-s3104" xml:space="preserve">ſia ſolamente pieno il tubo LK, <lb/>&amp; </s>
  <s xml:id="echoid-s3105" xml:space="preserve">O A R, parte della sferetta.</s>
  <s xml:id="echoid-s3106" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3107" xml:space="preserve">_Ofr_. </s>
  <s xml:id="echoid-s3108" xml:space="preserve">Io intendo beniſſimo che coſi debba eſſere, correndo quà <lb/>la medema ragione, che corre nel Baroſcopio. </s>
  <s xml:id="echoid-s3109" xml:space="preserve">Poiche
<pb o="14" file="00108" n="108" rhead="DIAZOGO"/>
l’aria dell’atmosfera premendo ſopra l’H I, mercurio del <lb/>vaſo, tiene ſoſpeſo tutto quel mercurio, che è alto 29. </s>
  <s xml:id="echoid-s3110" xml:space="preserve">diti <lb/>ſopra il liuello NHI.</s>
  <s xml:id="echoid-s3111" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3112" xml:space="preserve">_Cont_. </s>
  <s xml:id="echoid-s3113" xml:space="preserve">Fatto queſto ſi fori la sferetta ſopra vicino al C, con’ vn <lb/>buccolino piccolo quanto ſi vuole. </s>
  <s xml:id="echoid-s3114" xml:space="preserve">Secondo che l’aria <lb/>entrerà nella sferetta, premerà ſopra il mercurio OR, elo <lb/>farà ſalire per il tubo AB, à poco à poco, ſino che ſia arriua <lb/>to v. </s>
  <s xml:id="echoid-s3115" xml:space="preserve">g. </s>
  <s xml:id="echoid-s3116" xml:space="preserve">all’F, di modo che FR, ſia diti 29.</s>
  <s xml:id="echoid-s3117" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3118" xml:space="preserve">_Ofr_. </s>
  <s xml:id="echoid-s3119" xml:space="preserve">Vna ſimil’eſperienza, benche fatta con’ altri vaſi, &amp; </s>
  <s xml:id="echoid-s3120" xml:space="preserve">in-<lb/>uentata dall’inſigniſſimo geometra Roberual Franceſe, re-<lb/>giſtrano li Accademici Fiorentini _nelli ſaggi, &amp;</s>
  <s xml:id="echoid-s3121" xml:space="preserve">c. </s>
  <s xml:id="echoid-s3122" xml:space="preserve">cap_. </s>
  <s xml:id="echoid-s3123" xml:space="preserve">31. </s>
  <s xml:id="echoid-s3124" xml:space="preserve">co. <lb/></s>
  <s xml:id="echoid-s3125" xml:space="preserve">me eſperimentata da eſſi. </s>
  <s xml:id="echoid-s3126" xml:space="preserve">Queſta del Sig. </s>
  <s xml:id="echoid-s3127" xml:space="preserve">Sinclaro par più <lb/>
<anchor type="figure" xlink:label="fig-00108-01a" xlink:href="fig-00108-01"/>
ammirabile; </s>
  <s xml:id="echoid-s3128" xml:space="preserve">ma però sò che deue eſſer coſi. </s>
  <s xml:id="echoid-s3129" xml:space="preserve">Perche l’aria <lb/>della sferetta comunica con quella dell’atmosfera; </s>
  <s xml:id="echoid-s3130" xml:space="preserve">e perciò
<pb o="15" file="00109" n="109" rhead="TERZO."/>
preme con la mèdema forza, che preme eſſa: </s>
  <s xml:id="echoid-s3131" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s3132" xml:space="preserve">al ſcemarſi <lb/>del mercurio O A R, che ſaliſce per la canna AB, và ſupplen-<lb/>do la medema atmosfera, la qual premendo ſopra l’HI, <lb/>mercurio del vaſo ſtagnante, lo fà ſalire per KL, conſer-<lb/>uando ſempre il medemo liuello MR.</s>
  <s xml:id="echoid-s3133" xml:space="preserve"/>
</p>
<div xml:id="echoid-div27" type="float" level="2" n="1">
  <figure xlink:label="fig-00108-01" xlink:href="fig-00108-01a">
    <image file="00108-01" xlink:href="http://echo.mpiwg-berlin.mpg.de/zogilib?fn=/permanent/library/9EXVCG1R/figures/00108-01"/>
  </figure>
</div>
<p>
  <s xml:id="echoid-s3134" xml:space="preserve">_Cont_. </s>
  <s xml:id="echoid-s3135" xml:space="preserve">E coſi certamente, perche le cauſe aſſegnate da V. </s>
  <s xml:id="echoid-s3136" xml:space="preserve">Sig. <lb/></s>
  <s xml:id="echoid-s3137" xml:space="preserve">ſono le vere, e l’eſperienza fà vedere queſta verità. </s>
  <s xml:id="echoid-s3138" xml:space="preserve">Hora in <lb/>queſt’eſperienza biſogna notare due coſe regiſtrate dal Si-<lb/>gnor Sinclaro _nel medemo luogo, al num_. </s>
  <s xml:id="echoid-s3139" xml:space="preserve">5. </s>
  <s xml:id="echoid-s3140" xml:space="preserve">La prima è, _Hydrar-_ <lb/>_gyrum inter aſcendendum, non recto motu per tubulum erepere, ſed_ <lb/>_nor nullis potius volutationibus, quas oculo facilè percipere poteris_ <lb/>_ſupra cylindri verticem vbi globulus quidam ex ipſa Hydrargyri_ <lb/>_ſpuma non orizontaliter, ſed verticaliter tardè, aſcendente mercu-_ <lb/>_rio, circumuoluitur_.</s>
  <s xml:id="echoid-s3141" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3142" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s3143" xml:space="preserve">Hò inteſo. </s>
  <s xml:id="echoid-s3144" xml:space="preserve">V. </s>
  <s xml:id="echoid-s3145" xml:space="preserve">S. </s>
  <s xml:id="echoid-s3146" xml:space="preserve">hà addotto queſt’ eſperienza, acciò che fi <lb/>conoſca, che quando aſcende il mercurio anco quietamen-<lb/>te, &amp; </s>
  <s xml:id="echoid-s3147" xml:space="preserve">a poco a poco, ſaliſcono anco delli efluui, poiche al-<lb/>tro che efluui non è quella ſpuma.</s>
  <s xml:id="echoid-s3148" xml:space="preserve"/>
</p>
<p style="it">
  <s xml:id="echoid-s3149" xml:space="preserve">Cont. </s>
  <s xml:id="echoid-s3150" xml:space="preserve">_L’altra è, che_ Licet arctiſsime cœmento, vel quouis alio modo <lb/>occludas foraminulum C, vt aer externus nullum habeat influxum <lb/>in aerem internum, nihilominus ſuſtentatur cylindrus mercurialis, <lb/>idque ſolumodo virtute interni aeris ſuperficiem OR prœmentis.</s>
  <s xml:id="echoid-s3151" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3152" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s3153" xml:space="preserve">Non eſtenui adunque tanto Sig. </s>
  <s xml:id="echoid-s3154" xml:space="preserve">Ofredi la forza dell’aria; <lb/></s>
  <s xml:id="echoid-s3155" xml:space="preserve">poiche queſta in poca quantità può fare effetti molto con-<lb/>ſiderabili; </s>
  <s xml:id="echoid-s3156" xml:space="preserve">come ſi vede nel ſopradetto, premendo non ſo-<lb/>lo con la grauità propria, ma anco con l’elatere, che è po-<lb/>tente molto più, come dicono li elateriſti.</s>
  <s xml:id="echoid-s3157" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3158" xml:space="preserve">_Ofr_. </s>
  <s xml:id="echoid-s3159" xml:space="preserve">Mi riduca V. </s>
  <s xml:id="echoid-s3160" xml:space="preserve">S à memoria coſa ſia queſt’elaterè.</s>
  <s xml:id="echoid-s3161" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3162" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s3163" xml:space="preserve">E vna virtù agitatiua, ò riſpingitiua, che hà vna coſa <lb/>compreſſa per forza, con la quale procura de reſtituirſi al-<lb/>la ſua premiera, e natural eſpanſione, contrapremendo <lb/>chi la preme. </s>
  <s xml:id="echoid-s3164" xml:space="preserve">Per eſempio, ſe V. </s>
  <s xml:id="echoid-s3165" xml:space="preserve">S. </s>
  <s xml:id="echoid-s3166" xml:space="preserve">piegherà vna bacch et-<lb/>ta in forma d’arco, ſentirà la forza, che farà per ritornare <lb/>al ſuo natural ſito, &amp; </s>
  <s xml:id="echoid-s3167" xml:space="preserve">eſpanſione. </s>
  <s xml:id="echoid-s3168" xml:space="preserve">Queſta forza, ò reſpinger <lb/>la ſua mano s’addimanda ela tere.</s>
  <s xml:id="echoid-s3169" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3170" xml:space="preserve">_Ofr_. </s>
  <s xml:id="echoid-s3171" xml:space="preserve">Non più, che miſouuiene à ſufficienza. </s>
  <s xml:id="echoid-s3172" xml:space="preserve">M’arricordo, che <lb/>per eſemplificare queſta viitù elaſtica dell’ aria ſi ſeruono <lb/>dell’eſempio d’vn gran cumulo di Lana, nel quale li pelli,
<pb o="16" file="00110" n="110" rhead="DIALOGO"/>
che ſono più fondi ſono molto compreſſi da quelii, che li <lb/>ſouraſtano, di modo che rimoſſi queſti, quelli s, eſtendono <lb/>moltó più. </s>
  <s xml:id="echoid-s3173" xml:space="preserve">Così dicono, che conſtando l’aria noſtra, ò at-<lb/>mosfera delli efluui, che eſcono da tutti li corpi, queſti co-<lb/>me graui tendendo al centro comprimono l’inferiori no-<lb/>tabilmente, &amp; </s>
  <s xml:id="echoid-s3174" xml:space="preserve">eſſi fanno forza di liberarſi da quella com-<lb/>preſſione. </s>
  <s xml:id="echoid-s3175" xml:space="preserve">Altri chiamano queſta virtù elaſtica dell’ aria <lb/>Molla, perche l’elatere viene eſercitato anco dalla ſuſta, e <lb/>molla sì delli Horologi, come anco che s’adopra in al-<lb/>tri artificii.</s>
  <s xml:id="echoid-s3176" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3177" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s3178" xml:space="preserve">Quando li ſouuengono queſte coſe, intenderà anco facil-<lb/>mente quanto ſia potente queſta virtù elaſtica dell’aria; </s>
  <s xml:id="echoid-s3179" xml:space="preserve">la <lb/>quale compenſa beniſſimo alla grauità, di modo che po-<lb/>chiſſima aria con grand’elatere, cioè molto compreſſa, può <lb/>fare il medemo effetto che vna mole altiſſima d’aria con la <lb/>ſua grauità.</s>
  <s xml:id="echoid-s3180" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3181" xml:space="preserve">_Cont_. </s>
  <s xml:id="echoid-s3182" xml:space="preserve">Quanta forza habbia l’aria compreſſa con il ſuo elate-<lb/>rio, lo vediamo in infinite machine Hidrauliche, e con no-<lb/>ftra molt’ammiratione nell’ archibugio caricato à vento. <lb/></s>
  <s xml:id="echoid-s3183" xml:space="preserve">Poiche non fà tanta paſſata, ne il ferro è ſpinto fuori con <lb/>tanto empito, ſe non da queſto elaterio dell’ aria che <lb/>compreſſa molto più di quello, che hà in queſta noſtra <lb/>baſſa regione, nel dilatarſi imprime nel ferro quel grand’-<lb/>empito.</s>
  <s xml:id="echoid-s3184" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3185" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s3186" xml:space="preserve">V. </s>
  <s xml:id="echoid-s3187" xml:space="preserve">S. </s>
  <s xml:id="echoid-s3188" xml:space="preserve">diſcorre beniſſimo. </s>
  <s xml:id="echoid-s3189" xml:space="preserve">E ſe vuole hauere maggior cer-<lb/>tezza di ciò, con l’Archibuggio caricato in queſta noſtra <lb/>baſſa regione ſaliſca ſopra qualche monte, che vederà che <lb/>quanto più alto ſalirà, farà tanto maggior paſſata Così ſe <lb/>caricherà quà giù vna fontana hidraulica, e ſalirà ſopra il <lb/>monte, l’acqua vſcirà fuori con tanto maggior empito, e <lb/>durerà più ad vſcire. </s>
  <s xml:id="echoid-s3190" xml:space="preserve">Il contrario ſuccederebbe ſe con li det-<lb/>ti inſtrumenti caricati ſopra il monte diſcendeſſe à ſcari-<lb/>carli al baſſo, &amp; </s>
  <s xml:id="echoid-s3191" xml:space="preserve">al piano. </s>
  <s xml:id="echoid-s3192" xml:space="preserve">La cauſa è, perche la ſcarica ſi fà <lb/>con quell’empito, che corriſponde all’ ecceſſo dell’ elaterio <lb/>dell’aria caricata per forza nella machina, ſopra l’elaterio <lb/>della medema, che hà in quel luogo oue è. </s>
  <s xml:id="echoid-s3193" xml:space="preserve">Hora l aria di <lb/>queſte noſtre regioni ha maggior elaterio che quella del-<lb/>li monti.</s>
  <s xml:id="echoid-s3194" xml:space="preserve"/>
</p>
<pb o="17" file="00111" n="111" rhead="TERZO."/>
<p>
  <s xml:id="echoid-s3195" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s3196" xml:space="preserve">Tutto caminarebbe bene quando da queſte ſue eſpe-<lb/>rienze conſtaſſe queſt’elaterio dell’aria. </s>
  <s xml:id="echoid-s3197" xml:space="preserve">Ma queſto non <lb/>hauer luogo tẽtorno alcuni di dimoſtrare appreſſo li Acca-<lb/>demici Fiorentini con’vna eſperienza ſimile à quella, che <lb/>hor hora proponerò da tentare nel noſtro inſtrumento ſo-<lb/>pra dichiarato. </s>
  <s xml:id="echoid-s3198" xml:space="preserve">Auanti che con eſſo ſi procuri il voto, ſe <lb/>facia paſſare la canna LK, per vn bucco fatto nel fondo di <lb/>qualche maſtello, ſotto il quale ſia il vaſo del mercurio ſta-<lb/>gnante. </s>
  <s xml:id="echoid-s3199" xml:space="preserve">Fatto il voto, e diſceſo il mercurio come nella <lb/>ſigura, ò come habbiamo detto, ſi riempia il maſtello d’ac-<lb/>qua, e ſi facia il buccolino vicino al C. </s>
  <s xml:id="echoid-s3200" xml:space="preserve">L’acqua entrando <lb/>per il bucco C, e riempendo la palla, farà il medemo effet-<lb/>to di far ſalir il mercurio per la canna B A, che prima face-<lb/>ua l’ aria; </s>
  <s xml:id="echoid-s3201" xml:space="preserve">ma con queſta differenza, che non ſolo ſalirà <lb/>v. </s>
  <s xml:id="echoid-s3202" xml:space="preserve">g. </s>
  <s xml:id="echoid-s3203" xml:space="preserve">in F, di modo che R F, ſia diti 29. </s>
  <s xml:id="echoid-s3204" xml:space="preserve">come quando ſe riem-<lb/>piua d’aria, ma ſino all’E, di modo che F E, ſia la quartade-<lb/>cima parte dell’altezza dell’acqua, che nel maſtello preme <lb/>ſopra il mercurio MOR.</s>
  <s xml:id="echoid-s3205" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3206" xml:space="preserve">_Cont_. </s>
  <s xml:id="echoid-s3207" xml:space="preserve">Non hò dubio che coſi non debba ſuccedere, perche in <lb/>queſto caſo ſopra il mercurio MOR, preme tutta l’acqua <lb/>contenuta entro il maſtello dalla ſuperficie M O R, ſino al <lb/>ſommo dell’acqua, e ſopra queſta l atmosfera. </s>
  <s xml:id="echoid-s3208" xml:space="preserve">Hora queſta <lb/>deue alzar il mercurio nella canna BR, li ſoliti diti 29. </s>
  <s xml:id="echoid-s3209" xml:space="preserve">e l’-<lb/>acqua vn quartodecimo della ſua altezza; </s>
  <s xml:id="echoid-s3210" xml:space="preserve">eſſendo il mer-<lb/>curio quaſi 14. </s>
  <s xml:id="echoid-s3211" xml:space="preserve">volte più graue dell’acqua.</s>
  <s xml:id="echoid-s3212" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3213" xml:space="preserve">_Ofr_. </s>
  <s xml:id="echoid-s3214" xml:space="preserve">Hora V. </s>
  <s xml:id="echoid-s3215" xml:space="preserve">S. </s>
  <s xml:id="echoid-s3216" xml:space="preserve">otturi beniſſimo il bucco fatto vicino al C, e <lb/>facia vſcir tutta l’acqua dal maſtello. </s>
  <s xml:id="echoid-s3217" xml:space="preserve">Vederà che il mer-<lb/>curio non diſcenderà nella Canna. </s>
  <s xml:id="echoid-s3218" xml:space="preserve">Queſto non quuiene <lb/>per elaterio, che habbia l’acqua; </s>
  <s xml:id="echoid-s3219" xml:space="preserve">adunque nè anco quando <lb/>la palla è piena d’aria, queſto effetto naſce dall’ elaterio, ò <lb/>molla, che ella habbia.</s>
  <s xml:id="echoid-s3220" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3221" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s3222" xml:space="preserve">Non mi pare che la ſimilitudine corri. </s>
  <s xml:id="echoid-s3223" xml:space="preserve">Poiche l’acqua <lb/>patiſse, in comparatione dell’ aria, pochiſſima compreſſio-<lb/>ne. </s>
  <s xml:id="echoid-s3224" xml:space="preserve">Mentre adunque che queſta può pochiſſimo eſſer ri-<lb/>ſtretta in minor luogo (come diremo forſe frà poco) queſta <lb/>ſua repugnanza alla compreſſione è ſufficiente a render ra-<lb/>gione di queſto Fenomeno. </s>
  <s xml:id="echoid-s3225" xml:space="preserve">Al contrario l’aria è ſott opo-<lb/>ſta à gran compreſſione, di modo che con forza potreſſi
<pb o="18" file="00112" n="112" rhead="DIALOGO"/>
mo nel ſpatio della palla MCR, cacciar 6. </s>
  <s xml:id="echoid-s3226" xml:space="preserve">8. </s>
  <s xml:id="echoid-s3227" xml:space="preserve">e 10. </s>
  <s xml:id="echoid-s3228" xml:space="preserve">volte più <lb/>aria di quella, che conteneſſe ſenza queſta forza. </s>
  <s xml:id="echoid-s3229" xml:space="preserve">Mentre <lb/>adũque che ella può eſſer tanto compreſſa; </s>
  <s xml:id="echoid-s3230" xml:space="preserve">e tutto il mer-<lb/>curio RF, della canna non è ſuſſiciente à diſcender, enon <lb/>la comprime; </s>
  <s xml:id="echoid-s3231" xml:space="preserve">biſogna dir che reſiſta con l’elaterio.</s>
  <s xml:id="echoid-s3232" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3233" xml:space="preserve">_Oſre_. </s>
  <s xml:id="echoid-s3234" xml:space="preserve">In gratia arrechi qualche altra eſperienza, dalla quale ſi <lb/>conoſca queſt’elaterio dell’aria, &amp; </s>
  <s xml:id="echoid-s3235" xml:space="preserve">eſſer vero che pochiſſi-<lb/>ma aria con grand’elatere poſſi fare il medemo effetto, che <lb/>vna mole altiſſima d’eſſa con la ſua grauità.</s>
  <s xml:id="echoid-s3236" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3237" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s3238" xml:space="preserve">Già sò Sig. </s>
  <s xml:id="echoid-s3239" xml:space="preserve">Ofredi che V. </s>
  <s xml:id="echoid-s3240" xml:space="preserve">S. </s>
  <s xml:id="echoid-s3241" xml:space="preserve">e molto bene informata, che <lb/>riempito il tubo Torricelliano, ò Baroſcopio d’argentoui-<lb/>uo, &amp; </s>
  <s xml:id="echoid-s3242" xml:space="preserve">immerſo _more ſolito_ nel mercurio ſtagnante del vaſo, <lb/>che queſto diſcende, &amp; </s>
  <s xml:id="echoid-s3243" xml:space="preserve">occupa ſolo, ò vn braccio, &amp; </s>
  <s xml:id="echoid-s3244" xml:space="preserve"><emph style="sc">VIL</emph> <lb/>quarto Fiorentino in circa, ò li diti 29. </s>
  <s xml:id="echoid-s3245" xml:space="preserve">della miſura del Sig. <lb/></s>
  <s xml:id="echoid-s3246" xml:space="preserve">Sinclaro. </s>
  <s xml:id="echoid-s3247" xml:space="preserve">Parimẽte sò che V. </s>
  <s xml:id="echoid-s3248" xml:space="preserve">S. </s>
  <s xml:id="echoid-s3249" xml:space="preserve">sa che ſe il tubo foſſe lungo <lb/>per eſempio ſoli diti 20. </s>
  <s xml:id="echoid-s3250" xml:space="preserve">che riempito, &amp; </s>
  <s xml:id="echoid-s3251" xml:space="preserve">immerſo al mede-<lb/>mo modo non n’vſcirebbe in conto alcuno; </s>
  <s xml:id="echoid-s3252" xml:space="preserve">perche il con-<lb/>trapeſo, che li fà l’aria premente ſopra il mercurio ſtagnã-<lb/>te è ſufficiente à ſoſtenerne non diti 20. </s>
  <s xml:id="echoid-s3253" xml:space="preserve">ma 29. </s>
  <s xml:id="echoid-s3254" xml:space="preserve">Hora deue <lb/>ſapere che chi in queſto tubo poneſſe, per eſempio, diti 19. </s>
  <s xml:id="echoid-s3255" xml:space="preserve"><lb/>di mercurio, &amp; </s>
  <s xml:id="echoid-s3256" xml:space="preserve">vno d’acqua, che tanto, e tanto non vſci-<lb/>rebbe cos’alcuna; </s>
  <s xml:id="echoid-s3257" xml:space="preserve">ma chi con li diti 19. </s>
  <s xml:id="echoid-s3258" xml:space="preserve">laſciaſſe vn dito d’a-<lb/>ria, allora il mercurio diſcenderebbe per qualche ſpa-<lb/>tio.</s>
  <s xml:id="echoid-s3259" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3260" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s3261" xml:space="preserve">Corpo di me che queſta coſa mi pare impoſſibile. </s>
  <s xml:id="echoid-s3262" xml:space="preserve">Non <lb/>peſa più vn dito d’acqua che più di 1000. </s>
  <s xml:id="echoid-s3263" xml:space="preserve">d’aria? </s>
  <s xml:id="echoid-s3264" xml:space="preserve">Come dun-<lb/>que può eſſer queſto che vn dito d aria habbia più da pre-<lb/>mere, che vn dito d’acqua?</s>
  <s xml:id="echoid-s3265" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3266" xml:space="preserve">_Mat_ Molto anco più peſa vn dito di mercurio, e pure ne anco <lb/>queſto premeua come l’aria, quando la canna conteneua <lb/>tutti li diti 20. </s>
  <s xml:id="echoid-s3267" xml:space="preserve">di mercurio: </s>
  <s xml:id="echoid-s3268" xml:space="preserve">ma poi ne queſfo, ne quella hã-<lb/>no, che _ad ſummum_, pochiſſimo elatere, e forſi niente. </s>
  <s xml:id="echoid-s3269" xml:space="preserve">L a-<lb/>ria poi ſe bene hà pochiſſima grauità, ha grandiſsimo ela-<lb/>tere. </s>
  <s xml:id="echoid-s3270" xml:space="preserve">Perche deue ſapere Sig. </s>
  <s xml:id="echoid-s3271" xml:space="preserve">Ofredi, che eſſendo l’aria <lb/>incarcerata nel tubo della medema natura dell eſferiore, <lb/>cioè ſottopoſta alla medema compreſsione, che hauerebbe <lb/>ſe nell’aria libera li ſopra ſtaſſe l’aria alta quant’è l’atmosfe-<lb/>la, queſta fà l’equilibrio con la preſsione, che fà ſopra il
<pb o="19" file="00113" n="113" rhead="TERZO."/>
mercurio ſtagnante tutta l’altezza dell’atmosfera con la <lb/>ſua grauità. </s>
  <s xml:id="echoid-s3272" xml:space="preserve">Aggiunto adunque à queſt elaterio il peſo delli <lb/>19 diti di mercurio, tutto queſto compoſto eccede il peſo <lb/>dell’aria eſteriore premente ſecondo il peſo di queſti 19. </s>
  <s xml:id="echoid-s3273" xml:space="preserve">di-<lb/>ti. </s>
  <s xml:id="echoid-s3274" xml:space="preserve">Deue adunque diſcender il mercurio ſino che il dito d’ <lb/>aria con la ſua maggior eſpanſione habbia tanto debilitato <lb/>il proprio elatere, che queſto, inſieme con li rimanenti diti <lb/>di mercurio, s’equilibrino con l’aria eſteriore premente.</s>
  <s xml:id="echoid-s3275" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3276" xml:space="preserve">_Ofred_. </s>
  <s xml:id="echoid-s3277" xml:space="preserve">Se ſono vere queſte dottrine, parmi che ſi potrebbono <lb/>fare proue maggiori di queſt’elatere del dito d’aria, ſe con <lb/>queſt in ſtrumento ſi ſaliſce ad alto; </s>
  <s xml:id="echoid-s3278" xml:space="preserve">poiche quanto più ſi <lb/>ſaliſce, tanto più ſcenderebbe il mercurio della canna; </s>
  <s xml:id="echoid-s3279" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s3280" xml:space="preserve">in <lb/>conſequẽza il dito d’aria più aummentarebbe la ſua eſpan-<lb/>ſione.</s>
  <s xml:id="echoid-s3281" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3282" xml:space="preserve">_Cont_ Con queſta conſideratione il Signor Profeſſore mi fà <lb/>penetrare la cagione d’vn effetto, che più volte hò ammi-<lb/>rato. </s>
  <s xml:id="echoid-s3283" xml:space="preserve">Hò oſſeruato più volte, che forandoſi vna Botte pie-<lb/>na di vino, che foſſe beniſſimo chiuſa con il ſuo Cocone, <lb/>n’vſciua vn poco, e poi ſi fermaua, e non n’vſciua più. </s>
  <s xml:id="echoid-s3284" xml:space="preserve">Io <lb/>guardauo d’onde accadeſſe queſto accidente. </s>
  <s xml:id="echoid-s3285" xml:space="preserve">Hora cono-<lb/>ſco, che ciò può prouenire dall’elaterio dell’aria. </s>
  <s xml:id="echoid-s3286" xml:space="preserve">Non eſce <lb/>il vino dalla Botte totalmente piena forata in qualche luo-<lb/>go peril contrapeſo, che li fà l’aria eſteriore, ſufficiente à <lb/>ſoſtenerlo anco quando foſſe alto 18. </s>
  <s xml:id="echoid-s3287" xml:space="preserve">braccia Fiorentini in <lb/>circa, come è beniſſimo noto. </s>
  <s xml:id="echoid-s3288" xml:space="preserve">Onde potendo l’aria eſterio-<lb/>re ſoſtenerne braccia 18. </s>
  <s xml:id="echoid-s3289" xml:space="preserve">molto più potrà ſoſtenere quello <lb/>delle noſtre Botte alto due, o tre braccia, più, e meno. </s>
  <s xml:id="echoid-s3290" xml:space="preserve">Mà ſe <lb/>nel ſerrarſi il Cocone ſi ſerraſſe dell’aria nella Botte, queſta <lb/>eſſendo del medemo vigore con l’eſteriore, allora premen-<lb/>do più queſt’aria con il vino di quello che faceſſe l’aria eſte-<lb/>riore, n’vſcirà il vino ſino à tanto, chel’aria interiore hab-<lb/>bia tanto debilitato il proprio elàterio, che queſti con il vi-<lb/>no ſi pareggi all a preſſione dell aria eſteriore. </s>
  <s xml:id="echoid-s3291" xml:space="preserve">Il vino poi, <lb/>che eſce dalla Botte è in poca quantità, perche eſſendo or-<lb/>dinariamente poco il vino nelle noſtre Botte ordinarie, che <lb/>ſouraſta al foro, poco aggiuto può dare all’aria interiore; <lb/></s>
  <s xml:id="echoid-s3292" xml:space="preserve">onde ogni poco che ſe debiliti il ſuo elaterio, ſi fà l’equili-<lb/>brio con l’eſteriore.</s>
  <s xml:id="echoid-s3293" xml:space="preserve"/>
</p>
<pb o="20" file="00114" n="114" rhead="DIALOGO"/>
<p>
  <s xml:id="echoid-s3294" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s3295" xml:space="preserve">V. </s>
  <s xml:id="echoid-s3296" xml:space="preserve">S. </s>
  <s xml:id="echoid-s3297" xml:space="preserve">potrà comprobare il ſuo diſcorſo con queſta eſperi-<lb/>enza. </s>
  <s xml:id="echoid-s3298" xml:space="preserve">Fori vna Botte coſi chiuſa nel mezzo d’vno delli ſuoi <lb/>circoli, &amp; </s>
  <s xml:id="echoid-s3299" xml:space="preserve">vſcitone quel poco di vino, che dice vſcirne alle <lb/>volte, la fori poi piu ingiù vicino al fondo. </s>
  <s xml:id="echoid-s3300" xml:space="preserve">Poiche ſe ſarà <lb/>vero il ſuo diſcorſo, biſognerà che anco da queſto foro n’-<lb/>eſchi di nuouo qualche quantità. </s>
  <s xml:id="echoid-s3301" xml:space="preserve">E la ragione è manifeſta. <lb/></s>
  <s xml:id="echoid-s3302" xml:space="preserve">Perche fatto il foro nel mezzo, n’eſce ſino a tanto che l’a-<lb/>ria interiore habbia tanto debilitato il proprio elaterio, <lb/>che queſti con il vino ſopraſtante al bucco s’equilibri con <lb/>l’aria eſteriore. </s>
  <s xml:id="echoid-s3303" xml:space="preserve">Hora il vino ſopraſtante al bucco inferiore, <lb/>come più alto, preme più che il ſopraſtante al bucco di <lb/>mezzo; </s>
  <s xml:id="echoid-s3304" xml:space="preserve">e in conſeguenza con l’aria debilitata per la prima <lb/>vſcita preme più che non premeua il primo vino meno al-<lb/>to con queſta. </s>
  <s xml:id="echoid-s3305" xml:space="preserve">Onde ſuperando il contrapeſo dell’aria eſte-<lb/>riore, deue vſcir il vino ſino che debilitandoſi l’elaterio <lb/>dell’aria, li momenti ſi pareggino. </s>
  <s xml:id="echoid-s3306" xml:space="preserve">Ne vale il dire, che an-<lb/>che la contropreſſione dell’ aria eſteriore ſia maggiore nel <lb/>fondo, che nel mezzo, correndo quà la medema ragione <lb/>del Baroſcopio nel piano, e nell’alto; </s>
  <s xml:id="echoid-s3307" xml:space="preserve">perche ſe bene queſto <lb/>è vero à tutto rigore, nulladimeno per la poca diſtanza trà <lb/>li due fori, queſta differenza di contrapreſſione deue eſſer <lb/>fiſicamente inſenſibile. </s>
  <s xml:id="echoid-s3308" xml:space="preserve">Tale non è la differenza delle due <lb/>altezze del vino della Botte.</s>
  <s xml:id="echoid-s3309" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3310" xml:space="preserve">_Ofr_. </s>
  <s xml:id="echoid-s3311" xml:space="preserve">Queſta eſperienza, quando ſucceda, mi fà chiuder la boc-<lb/>ca, e ſtimar di niun va lore vna riſpoſta, che m’apparecchia-<lb/>uo di dare al Signor Conte. </s>
  <s xml:id="echoid-s3312" xml:space="preserve">Voleuo dire, che non vſciua il <lb/>vino _ne detur vacuum_. </s>
  <s xml:id="echoid-s3313" xml:space="preserve">Perche fatto il primo foro, eſce il vino <lb/>ſino à tanto, che l’aria ſe ſia rarefatta quanto puole ad oc-<lb/>cupar quel ſpatio. </s>
  <s xml:id="echoid-s3314" xml:space="preserve">Ma poi rarefatta al poſſibile, non può <lb/>più il vino diſcendere, perche allora ſi daria vacuo. </s>
  <s xml:id="echoid-s3315" xml:space="preserve">Má per-<lb/>che vſcirà poi dal bucco inferiore? </s>
  <s xml:id="echoid-s3316" xml:space="preserve">Anco allora ſi darebbe <lb/>il vacuo. </s>
  <s xml:id="echoid-s3317" xml:space="preserve">Onde non douerebbe vſcire Se adunque eſce, e <lb/>ſegno che il vacuo non ha che fare.</s>
  <s xml:id="echoid-s3318" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3319" xml:space="preserve">_Cont_. </s>
  <s xml:id="echoid-s3320" xml:space="preserve">In queſto mentre la mia fantaſia s’è andata ragirando <lb/>circa vn’altro accidente. </s>
  <s xml:id="echoid-s3321" xml:space="preserve">Ho oſſeruato più volte, che riem-<lb/>pita, e chiuſa vna Botte, queſta non ſpandeua in conto al-<lb/>cuno. </s>
  <s xml:id="echoid-s3322" xml:space="preserve">Poi improuiſamente gocciaua da qualche ſpiraglio. <lb/></s>
  <s xml:id="echoid-s3323" xml:space="preserve">Si fermaua da ſua poſta, e di nuouo doppo qualche tempo
<pb o="21" file="00115" n="115" rhead="TERZO."/>
tornaua à gocciare. </s>
  <s xml:id="echoid-s3324" xml:space="preserve">Miveniua detto, che vn Tarlo haue-<lb/>ua fornito di roder, e far vn buccolino, dal quale vſciua il <lb/>vino, &amp; </s>
  <s xml:id="echoid-s3325" xml:space="preserve">altri accidenti; </s>
  <s xml:id="echoid-s3326" xml:space="preserve">quali non dirò che alle volte non <lb/>poſſino hauer luogo. </s>
  <s xml:id="echoid-s3327" xml:space="preserve">Ma anco può eſſere che ò per il Sole, <lb/>ò per altro accidente riſcaldata l’aria, &amp; </s>
  <s xml:id="echoid-s3328" xml:space="preserve">il vino della Botte, <lb/>l’aria principalmẽte aummẽti il ſuo elaterio; </s>
  <s xml:id="echoid-s3329" xml:space="preserve">onde ſuperan-<lb/>do queſto compoſto il contrapremere dell’aria eſteriore, <lb/>caccia fuori quelle goccie ſino à tanto, che ſi faccia di nuo-<lb/>uo l’equilibrio. </s>
  <s xml:id="echoid-s3330" xml:space="preserve">Poi torni _toties, &amp; </s>
  <s xml:id="echoid-s3331" xml:space="preserve">quoties_ ſi facia q ueſt’al-<lb/>teratione.</s>
  <s xml:id="echoid-s3332" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3333" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s3334" xml:space="preserve">Non dico che così non poſſi eſſere qualche volta, mà <lb/>molte varietà poſſono ſuccedere. </s>
  <s xml:id="echoid-s3335" xml:space="preserve">Veda Signor Conte; </s>
  <s xml:id="echoid-s3336" xml:space="preserve">al-<lb/>tra preſſione cagiona la coſa graue con la propria grauità <lb/>aſſolutamente, altra con queſta aggiutata con il moto. </s>
  <s xml:id="echoid-s3337" xml:space="preserve">Ciò <lb/>è tanto manifeſto, che nulla più. </s>
  <s xml:id="echoid-s3338" xml:space="preserve">Onde la coſa graue ag-<lb/>giutata dal moto ſi caccierà, e paſſerà per di quelli bucchi, <lb/>nelli quali mai entrarebbe con la ſola grauita. </s>
  <s xml:id="echoid-s3339" xml:space="preserve">Riſcaldato <lb/>adunque il vino per qual ſi ſia accidente, ò fatto d’eſſo qual <lb/>ſi ſia fermentatione, le ſue particelle ſono collocate in vn <lb/>moto molto conſiderabile. </s>
  <s xml:id="echoid-s3340" xml:space="preserve">Onde aggiutate dalla grauità, <lb/>poſſono vſcire per quelli buccolini, per li quali altrimente <lb/>non vſcirebbero. </s>
  <s xml:id="echoid-s3341" xml:space="preserve">Ceſſato queſto calore, &amp; </s>
  <s xml:id="echoid-s3342" xml:space="preserve">ebollitione <lb/>eſtraordinaria, ceſſa l’vſcita. </s>
  <s xml:id="echoid-s3343" xml:space="preserve">Ritornato il calore, ritorna <lb/>l’vſcita. </s>
  <s xml:id="echoid-s3344" xml:space="preserve">E coſi diſcorrendo. </s>
  <s xml:id="echoid-s3345" xml:space="preserve">Aggiungaſi à queſto, che ri-<lb/>ſcaldato il vino ſi rarefà, cioè le ſue particelle ſi diſciolgo-<lb/>no, e ſeparano più di quello, che erano; </s>
  <s xml:id="echoid-s3346" xml:space="preserve">Onde ciaſcuna, ò al-<lb/>cune di queſte poſſono più prontamente penetrare per <lb/>quelli bucchi, per li quali non poteuano entrare congion-<lb/>te con altre in maggior quantità.</s>
  <s xml:id="echoid-s3347" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3348" xml:space="preserve">_ont_. </s>
  <s xml:id="echoid-s3349" xml:space="preserve">Sò anch’io, che le particelle delli liquidi graui pene-<lb/>trano più collocate in moto per riſcaldatione, che ſenza; </s>
  <s xml:id="echoid-s3350" xml:space="preserve">e <lb/>tanto piu, quanto ſaranno per la rarefattione più libere, <lb/>e ſottili. </s>
  <s xml:id="echoid-s3351" xml:space="preserve">E q ieſta è la cagione che li Signori Medici vor-<lb/>ranno, per eſempio, che ſe pigli il ſiroppo caldo, e non fred-<lb/>do; </s>
  <s xml:id="echoid-s3352" xml:space="preserve">perche operando queſto per l’inſinuatione delle ſue <lb/>minime partrcelle, più ſi puole inſinuare aggiutato già dal <lb/>calore eſterno, che douendoſi riſcaldare nel ventricolo. </s>
  <s xml:id="echoid-s3353" xml:space="preserve">Se <lb/>V. </s>
  <s xml:id="echoid-s3354" xml:space="preserve">S. </s>
  <s xml:id="echoid-s3355" xml:space="preserve">hauera vna Botte ſcachita, e cõ molte rimule, ò sfeſse
<pb o="22" file="00116" n="116" rhead="DIALOGO"/>
per eſſer vn pezzo ſtata ſenza vino, e vorrà ſerrar queſte, <lb/>ottenirà ciò tenendola per lungo tempo riempita d’acqua <lb/>fredda, infondendone ſempre quanta n’vſciſſe; </s>
  <s xml:id="echoid-s3356" xml:space="preserve">perche li <lb/>minimi dell’acqua penetreranno à poco à poco nelli pori <lb/>del legno, &amp; </s>
  <s xml:id="echoid-s3357" xml:space="preserve">ingroſſando, e dilatando le Doghe, che la <lb/>compongono, &amp; </s>
  <s xml:id="echoid-s3358" xml:space="preserve">in conſeguenza accoſtando più l’vna all’-<lb/>altra, alla fine chiuderanno tutte quelle fiſſure, e buccolini. <lb/></s>
  <s xml:id="echoid-s3359" xml:space="preserve">Ma ſe li farà vn brombo, cioè li caccierà dentro dell’acqua <lb/>ben bene calda, anco non in molta quantità, e l’otturerà <lb/>ben bene, ottenirà il ſuo intento in tempo aſſai minore, e <lb/>con molto minor fatica. </s>
  <s xml:id="echoid-s3360" xml:space="preserve">Perche li minimi dell’acqua dal <lb/>fuoco coſtituiti in moto, e fatti più tenui cõ la ſeparatione, <lb/>più prontamente ſe cacciano in quelli pori, e fanno l’ef-<lb/>fetto, che ſi pretende.</s>
  <s xml:id="echoid-s3361" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3362" xml:space="preserve">_Ofr_. </s>
  <s xml:id="echoid-s3363" xml:space="preserve">Io l’inuerno mi lauo le mani con l’acqua calda. </s>
  <s xml:id="echoid-s3364" xml:space="preserve">Chi non <lb/>è filoſofo, come ſon’io, dice queſto eſſer effetto di poltrone-<lb/>ria, e miſeria. </s>
  <s xml:id="echoid-s3365" xml:space="preserve">Ma queſti non l’intende. </s>
  <s xml:id="echoid-s3366" xml:space="preserve">L’acqua calda è <lb/>più atta à nettare dal ſuccidume, che la fredda. </s>
  <s xml:id="echoid-s3367" xml:space="preserve">Perche li mi <lb/>nimi di quella ſono per le cauſe ſopradette più pronti a <lb/>cacciarſi nelli pori della carne, &amp; </s>
  <s xml:id="echoid-s3368" xml:space="preserve">inſinuarſi nel ſuccidume; <lb/></s>
  <s xml:id="echoid-s3369" xml:space="preserve">e coſi renderlo più trattabile, e maneggeuole, che li mini-<lb/>mi di queſta; </s>
  <s xml:id="echoid-s3370" xml:space="preserve">onde poi con la confricatione delle mani ſi le-<lb/>ua via faciliſſimamente.</s>
  <s xml:id="echoid-s3371" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3372" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s3373" xml:space="preserve">V.</s>
  <s xml:id="echoid-s3374" xml:space="preserve">S. </s>
  <s xml:id="echoid-s3375" xml:space="preserve">dice beniſsimo. </s>
  <s xml:id="echoid-s3376" xml:space="preserve">Ma troppo habbiamo digredito, nè <lb/>però ſin’ad hora habbiamo totalmente eſpoſta la noſtra <lb/>mente circa le cauſe delli Fenomeni ſopra narrati del Sig <lb/>Sinclaro; </s>
  <s xml:id="echoid-s3377" xml:space="preserve">cioè perche purgato il mercurio per mezzo d’vn <lb/>filo di ferro cacciato ben bene entro la fiſtola, dall’ aria in <lb/>eſſo rachiu ſa, queſti ſaliſca più alto, che quando non ſi vſa <lb/>queſta diligenza; </s>
  <s xml:id="echoid-s3378" xml:space="preserve">e perche quando ſi ſcuote il mercurio<unsure/> <lb/>della canna diſcendendo dal monte, ò calandolo da alto <lb/>ò in altro modo, diſcenda più che non fà ordinariamente <lb/>Di ambidue queſti effetti credo che ſia cagione in parte l’ <lb/>vſcita delli efluui, mà però diuerſamente. </s>
  <s xml:id="echoid-s3379" xml:space="preserve">Queſto è certiſ <lb/>ſimo, che quando riempita la fiſtola di mercurio ſi procura <lb/>il voto, cioè ſi fa diſcendere ſino alli diti 29. </s>
  <s xml:id="echoid-s3380" xml:space="preserve">altezza con <lb/>ſueta, ſaliſce ſopra l’eſtremità del mercurio l’aria della qua <lb/>le per auuentura egli è pregno, &amp; </s>
  <s xml:id="echoid-s3381" xml:space="preserve">altri aliti inuiſibili. </s>
  <s xml:id="echoid-s3382" xml:space="preserve">Anz
<pb o="23" file="00117" n="117" rhead="TERZO."/>
che li Accademici Fiorentini _nelli ſaggi, &amp;</s>
  <s xml:id="echoid-s3383" xml:space="preserve">c. </s>
  <s xml:id="echoid-s3384" xml:space="preserve">à carte_ 28. </s>
  <s xml:id="echoid-s3385" xml:space="preserve">inſe-<lb/>gnano vn modo di vedere la loro ſalita, dicendo à queſto <lb/>propoſito. </s>
  <s xml:id="echoid-s3386" xml:space="preserve">_Queſto ſi vede manifeſtamente ogni volta, che nella_ <lb/>_canna s’introduce vn po d’acqua, la quale nel farſi il voto ſalendo_ <lb/>_ſopra l’argento, diſcopre nel paſſaggio che fanno per lo ſuo mezzo,_ <lb/>_quei finiſſimirebullimenti, che da eſſo verſo il voto s’inalzano._</s>
  <s xml:id="echoid-s3387" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3388" xml:space="preserve">_Cont._ </s>
  <s xml:id="echoid-s3389" xml:space="preserve">Belliſsimo modo di vedere queſta falica quando lacqua <lb/>ſia purgatiſsima dall’aria, e dalli eflui, che eſcono da eſſa <lb/>ſenza comparatione in maggior quantità, che dal mercu-<lb/>rio. </s>
  <s xml:id="echoid-s3390" xml:space="preserve">Onde quando non ſia purgatiſsima, ſarà difficile di-<lb/>ſcerner ſe ſiano efluui della medema acqua, ò pure del <lb/>mercurio.</s>
  <s xml:id="echoid-s3391" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3392" xml:space="preserve">_Mat._ </s>
  <s xml:id="echoid-s3393" xml:space="preserve">Hora queſti eflui ſaliti ſopra il mercurio eſercitano ſo-<lb/>pra eſſo, e con eſso quella medema grauità, che eſercita-<lb/>uano entro eſso Onde, e del mercurio, e d’eſſi faſſi pure <lb/>vn compoſto, che ſi paragona con il cilindro d’aria, che <lb/>preme ſopra il mercurio ſtagnante, il qual cõpoſto è mag-<lb/>giore, e preme più che il ſolo mercurio. </s>
  <s xml:id="echoid-s3394" xml:space="preserve">Ma quando nella <lb/>fiſtola ſi pone il mercurio purgato dall’aria, non ſalendo <lb/>ſopra eſso, o nulla, ò almeno pochiſſi no, ſeil mercurio s’-<lb/>hà da equilibrare con l’aria p@emente, bi ogna che ſaliſca <lb/>quel più, che premeuano quelli efluui, che erano in eſso, c<unsure/> <lb/>che ſariano ſaliti ſopra eſso.</s>
  <s xml:id="echoid-s3395" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3396" xml:space="preserve">_Ofr_. </s>
  <s xml:id="echoid-s3397" xml:space="preserve">V.</s>
  <s xml:id="echoid-s3398" xml:space="preserve">S. </s>
  <s xml:id="echoid-s3399" xml:space="preserve">dica anco la ſua opinione circa la cauſa della diſceſa <lb/>del mercurio più del conſueto quando queſto ſia ſcofso, <lb/>&amp; </s>
  <s xml:id="echoid-s3400" xml:space="preserve">agitato.</s>
  <s xml:id="echoid-s3401" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3402" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s3403" xml:space="preserve">E queſta pure credo che naſca dalla ſalita delli efluui, e <lb/>purgamento del mercurio fatto ò auanti il procurarſi il vo-<lb/>to, ò anco in virtù dell’agitatione, e concuſſione. </s>
  <s xml:id="echoid-s3404" xml:space="preserve">Ma per <lb/>intender il come, mi dica Signor Ofredi; </s>
  <s xml:id="echoid-s3405" xml:space="preserve">ha mai oſseruato <lb/>quelli, che vendono il formento, ò altre bi<unsure/>ade? </s>
  <s xml:id="echoid-s3406" xml:space="preserve">C@oè quan-<lb/>to ſiano geloſi, che non ſe diano ſcoſse a ſtaio, ò altra mi-<lb/>ſura con la quale miſurano?</s>
  <s xml:id="echoid-s3407" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3408" xml:space="preserve">_Ofr_. </s>
  <s xml:id="echoid-s3409" xml:space="preserve">L’ho oſseruato certo. </s>
  <s xml:id="echoid-s3410" xml:space="preserve">Et hanno molto ben ragione d’eui-<lb/>tare queſte ſcoſse; </s>
  <s xml:id="echoid-s3411" xml:space="preserve">perche ſe alcuno daise del piede nello <lb/>ſtaio gia pieno, farebbe non poco diſcender la biada; </s>
  <s xml:id="echoid-s3412" xml:space="preserve">per-<lb/>che li grani, che ſi toccano con gran la ſſitudine, elibertà, <lb/>contenendo frà ſe infinite cauita aſsai conſiderabili; </s>
  <s xml:id="echoid-s3413" xml:space="preserve">con
<pb o="24" file="00118" n="118" rhead="DIALOGO"/>
quelle ſcoſse ſi ſtiuariano più, e ſi toccheriano, &amp; </s>
  <s xml:id="echoid-s3414" xml:space="preserve">vniriano <lb/>più frà ſe ſteſſi.</s>
  <s xml:id="echoid-s3415" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3416" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s3417" xml:space="preserve">Tãto biſogna immaginarſi che ſucceda alle minime par-<lb/>ticelle dell argentouiuo. </s>
  <s xml:id="echoid-s3418" xml:space="preserve">Vſciti da eſso li eflui, quelle parti-<lb/>celle reſtano più libere, e ſciolte con quelle iufinite cauità, <lb/>dalle quali ſono vſciti li efluui; </s>
  <s xml:id="echoid-s3419" xml:space="preserve">ſono più fluide, e ſi tocca-<lb/>no in minor parte delle loro ſuperficie. </s>
  <s xml:id="echoid-s3420" xml:space="preserve">Quando ſi dano <lb/>ſcoſse alla canna, e ſi concute il mercurio, le ſue minime <lb/>particelle s’vniſcono, conſtipano, e ſtiuano più frà ſe ſteſ-<lb/>ſe; </s>
  <s xml:id="echoid-s3421" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s3422" xml:space="preserve">in conſeguenza occupano minor luogo, e diſcen-<lb/>dono.</s>
  <s xml:id="echoid-s3423" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3424" xml:space="preserve">_Ofr_. </s>
  <s xml:id="echoid-s3425" xml:space="preserve">Queſta ragione non mi diſpiace affatto; </s>
  <s xml:id="echoid-s3426" xml:space="preserve">anzi che l’hò ſen-<lb/>tita con qualche piacere. </s>
  <s xml:id="echoid-s3427" xml:space="preserve">Come hò ſentito con mio total <lb/>contento dir di ſopra, che nel procurarſi il voto con l’ar-<lb/>gentouiuo, &amp; </s>
  <s xml:id="echoid-s3428" xml:space="preserve">anco con il laſciar ſopra eſso vn poco d’ac-<lb/>qua, eſca, e da eſso, e molto più dall’acqua, copia conſide-<lb/>rabile d’efluui. </s>
  <s xml:id="echoid-s3429" xml:space="preserve">O come che queſta eſperienza confonde <lb/>quelli, li quali dicono darſi il vacuo nella ſommità di quel-<lb/>le canne! E perche faſſi la ſalità di queſti eflum, ſe non, _nè_ <lb/>_detur vacuum_ ſommamente abborito dalla natura?</s>
  <s xml:id="echoid-s3430" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3431" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s3432" xml:space="preserve">Io non voglio ricercare ſe iui ſia vacuo, e nò; </s>
  <s xml:id="echoid-s3433" xml:space="preserve">ma dico be-<lb/>ne, che non ſaliſcono li efluui dalli predetti liquidi _nè detur_ <lb/>_v acuum,_ mà per altra cauſa; </s>
  <s xml:id="echoid-s3434" xml:space="preserve">cioè perche le parti di quelli li-<lb/>quidi non ſono premute dall aria, ò da altro, come prima <lb/>Nō _nè detur vacuũ_, perche non aſcendono li eflui ſe non già <lb/>diſceſo il mercurio, e fatto il voto; </s>
  <s xml:id="echoid-s3435" xml:space="preserve">onde già ſe darebbe il <lb/>vacuo, ſe eſſi ſaliſsero a riempirlo. </s>
  <s xml:id="echoid-s3436" xml:space="preserve">E poi, ſe beniſſimo pur-<lb/>gato il mercurio, con eſso ſi procurerà il voto, deſcenderà <lb/>queſti alla conſueta altezza d’vn braccio, &amp; </s>
  <s xml:id="echoid-s3437" xml:space="preserve">vn quarto in <lb/>circa. </s>
  <s xml:id="echoid-s3438" xml:space="preserve">E pure non ſaliſc ono eſluui, ò almeno pochiſſimi <lb/>Chi riempie allora il vacuo? </s>
  <s xml:id="echoid-s3439" xml:space="preserve">Adunque, ò queſti ſi dà ſem-<lb/>pre, ò viene proibito da altre cauſe.</s>
  <s xml:id="echoid-s3440" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3441" xml:space="preserve">_Ofr_. </s>
  <s xml:id="echoid-s3442" xml:space="preserve">Ma come dice V. </s>
  <s xml:id="echoid-s3443" xml:space="preserve">S. </s>
  <s xml:id="echoid-s3444" xml:space="preserve">che la ſalita di queſt’ efluui venga ca-<lb/>gionata dalla ceſsatione della preſſione?</s>
  <s xml:id="echoid-s3445" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3446" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s3447" xml:space="preserve">Già è notiſſimo appreſso il Boile in più luoghi, e princi-<lb/>palmente in quel trattatello il cui titolo _Mira aeris (etiam_ <lb/>_citra calorem) rarefactio detecta_, come anco appreſso d’altri <lb/>autori, che poſto nella ſua machina (con la quale ſi pro
<pb o="25" file="00119" n="119" rhead="TERZO."/>
cura il voto leuandone l’aria) vn vaſetto d’acqua, ſecondo <lb/>che la machina ſe và euacuando d’aria, che l’acqua prin-<lb/>cipia bollire furioſamente, &amp; </s>
  <s xml:id="echoid-s3448" xml:space="preserve">euaporare tanto più, quanto <lb/>più s’euacua la machina; </s>
  <s xml:id="echoid-s3449" xml:space="preserve">sìche continuandoſi l’euacuatio-<lb/>ne, l’acqua ſi diminuiſce notabilmente. </s>
  <s xml:id="echoid-s3450" xml:space="preserve">Se poi liberata <lb/>che ſia l’acqua dall’aria, e dalle parti più ſottili (il che co-<lb/>me dice il medemo Boile _alla pagina 11. </s>
  <s xml:id="echoid-s3451" xml:space="preserve">del cit. </s>
  <s xml:id="echoid-s3452" xml:space="preserve">trat_ non ſe fà <lb/>così facilmente) ſe torna à rimettere nella machina già <lb/>tornata à riempirſi d’aria il medemo vaſetto, e queſta di <lb/>nuouo s’cuacua dall’aria; </s>
  <s xml:id="echoid-s3453" xml:space="preserve">l’acqua del vaſetto ò non bolle <lb/>più, ò pochiſſimo. </s>
  <s xml:id="echoid-s3454" xml:space="preserve">Queſto dimoſtra che non bolle, &amp; </s>
  <s xml:id="echoid-s3455" xml:space="preserve">eua-<lb/>pora per impedir il vacuo, ma che di queſto bollimento ne <lb/>ſia cagione il leuar l’aria dalla machina. </s>
  <s xml:id="echoid-s3456" xml:space="preserve">Quando ſi pone <lb/>in eſſa il vaſetto con l’acqua, queſta viene compreſſa dall’-<lb/>aria della machina con quella preſſione, &amp; </s>
  <s xml:id="echoid-s3457" xml:space="preserve">elaterio, con la <lb/>quale preme l’aria eſteriore, eſſendo della medema natura. <lb/></s>
  <s xml:id="echoid-s3458" xml:space="preserve">Onde le parti dell’acqua ſono ſtrette inſieme; </s>
  <s xml:id="echoid-s3459" xml:space="preserve">nè può eua-<lb/>porare così facilmente. </s>
  <s xml:id="echoid-s3460" xml:space="preserve">Quando poi ſi leua l’aria dalla <lb/>machina, ſi ſminuiſse il ſuo elaterio, e compreſſione; </s>
  <s xml:id="echoid-s3461" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s3462" xml:space="preserve">in <lb/>conſeguenza le particelle dell’ acqua reſtano più libere, e <lb/>ſciolte; </s>
  <s xml:id="echoid-s3463" xml:space="preserve">onde eſcono le più ſottili, leggieri, e pronte al mo-<lb/>to; </s>
  <s xml:id="echoid-s3464" xml:space="preserve">e queſto ſempre più continua, quanto maggiormente <lb/>s’eſtrae l’aria, ſino che dall’acqua ſiano vſcite queſte parti-<lb/>celle pronte al moto. </s>
  <s xml:id="echoid-s3465" xml:space="preserve">L’altre non così pronte rimangono, <lb/>mà più ſciolte, che quando erano premute dall’aria. </s>
  <s xml:id="echoid-s3466" xml:space="preserve">Che <lb/>poi ripoſto il vaſetto nella machina non euapori più, naſce <lb/>perche già ſono volate le parti ſottili; </s>
  <s xml:id="echoid-s3467" xml:space="preserve">onde non vi è più <lb/>coſa habbia ad vſcire, ò almeno in poca quantità.</s>
  <s xml:id="echoid-s3468" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3469" xml:space="preserve">_Ofr_. </s>
  <s xml:id="echoid-s3470" xml:space="preserve">V S.</s>
  <s xml:id="echoid-s3471" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s3472" xml:space="preserve">hora, &amp; </s>
  <s xml:id="echoid-s3473" xml:space="preserve">in molti altri luoghi di queſto noſtro di-<lb/>ſcorſo hà ſuppoſto vna coſa, che io tengo per impoſſibile; <lb/></s>
  <s xml:id="echoid-s3474" xml:space="preserve">cioè che l’acqua patiſca compreſſione.</s>
  <s xml:id="echoid-s3475" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3476" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s3477" xml:space="preserve">Io Sig. </s>
  <s xml:id="echoid-s3478" xml:space="preserve">Ofredi non ſolo tengo che l’acqua, e li altri liqui-<lb/>di patiſchino qualche compreſſione, cioè che le ſue mini-<lb/>me particelle poſſino eſſer più ſtrette, vnite, e conſtipate <lb/>inſieme da forza eſtrinſeca premente di quello che ſono, <lb/>ma anco tutti li altri corpi per duri, e ſodi che ſiano. </s>
  <s xml:id="echoid-s3479" xml:space="preserve">E pe-<lb/>rò ben vero, che in alcuni queſta compreſſione, e conſtipa-<lb/>tione difficilmente può eſſer conoſciuta dalli noſtri ſenſi;</s>
  <s xml:id="echoid-s3480" xml:space="preserve">
<pb o="26" file="00120" n="120" rhead="DIALOGO"/>
e tanto ſuccede all’acqua. </s>
  <s xml:id="echoid-s3481" xml:space="preserve">A queſta compreſſione li corpi <lb/>reſiſtono quanto poſſono, inſinuandoſi, principalmente <lb/>li liquidi, con le loro minime particelle per tutto oue poſ-<lb/>ſono. </s>
  <s xml:id="echoid-s3482" xml:space="preserve">Mà quando non pono far di meno, biſogna che ſe <lb/>c’accomodino.</s>
  <s xml:id="echoid-s3483" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3484" xml:space="preserve">_Ofr_. </s>
  <s xml:id="echoid-s3485" xml:space="preserve">A queſta compreſſione repugnano manifeſtamente al-<lb/>cune eſperienze fatte dalli Signori Accademici Fioren-<lb/>tini.</s>
  <s xml:id="echoid-s3486" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3487" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s3488" xml:space="preserve">Queſti Signori principiando _alla pag._ </s>
  <s xml:id="echoid-s3489" xml:space="preserve">197. </s>
  <s xml:id="echoid-s3490" xml:space="preserve">adducono tre <lb/>eſperienze in queſta materia, con le quali pretendono <lb/>non de dimoſtrare aſſolutamente che l’acqua non patiſca <lb/>alcuna compreſſione, ma che ad eſſi con dette eſperienze <lb/>non ſia riuſcito di notarla, e vederla con li occhi. </s>
  <s xml:id="echoid-s3491" xml:space="preserve">Il che è <lb/>neceſſario crederli in tutti li modi. </s>
  <s xml:id="echoid-s3492" xml:space="preserve">E certo che con la <lb/>prima non mi par poſſibile che la poteſſero vedere in con <lb/>to alcuno. </s>
  <s xml:id="echoid-s3493" xml:space="preserve">La legga Sig. </s>
  <s xml:id="echoid-s3494" xml:space="preserve">Ofredi.</s>
  <s xml:id="echoid-s3495" xml:space="preserve"/>
</p>
<p style="it">
  <s xml:id="echoid-s3496" xml:space="preserve">Ofr. </s>
  <s xml:id="echoid-s3497" xml:space="preserve">sieno all’eſtremità de’ due cannelli <lb/>
<anchor type="figure" xlink:label="fig-00120-01a" xlink:href="fig-00120-01"/>
di criſtallo AB, AC, due palle parimen. <lb/></s>
  <s xml:id="echoid-s3498" xml:space="preserve">te di cristallo, l’vna maggiore dell’al-<lb/>tra. </s>
  <s xml:id="echoid-s3499" xml:space="preserve">Empianſi ambidue questi vaſi d’-<lb/>acqua comune ſino in D,E, ed anneſtan-<lb/>dogli inſieme alla lucerna, s’auuerta à <lb/>laſciar libero nella ſaldatura il paſſag-<lb/>gio all’aria, e à tirar più lungo che ſia <lb/>poſſibile il beccuccio AF, il quale ſi la-<lb/>ſci aperto. </s>
  <s xml:id="echoid-s3500" xml:space="preserve">Dipoi s’applichino à tutt’a <lb/>due le palle due biccbieri pieni di <lb/>ghiaccio ſminuzzato in cui rimanga-<lb/>no ſepolte, perche ristrignendoſi l’ae <lb/>qua, entri nel vano del cannello quella <lb/>più aria che ſia poſſibile. </s>
  <s xml:id="echoid-s3501" xml:space="preserve">Anziper me-<lb/>glio caricarnelo ſi vada per vn pezzo <lb/>stroſinãdo eſteriormẽte con pezzuoli di <lb/>ghiaccio tutto il ſifone DE, acciocche <lb/>ristrignendo ſi di man in mano per ope-<lb/>ra del freddo l’aria, che v’entra dall’o-<lb/>rifizio F, ne venga ſucoeſſiuamente del-<lb/>lanuoua, ſi che ſigillandolo poi alla fiamma, virimanga ſti@
<pb o="27" file="00121" n="121" rhead="TERZO."/>
ta; </s>
  <s xml:id="echoid-s3502" xml:space="preserve">e stretta. </s>
  <s xml:id="echoid-s3503" xml:space="preserve">Sigillato ch ei ſarà, ſi caui di ſotto ’l ghiaccio la pal-<lb/>la B, e temper at ala prima nell’ acqua tiepida, ſi tuffi nella calda, e <lb/>da vltimo nella bollente, ſeguitando pero a tener ſempre immerfa <lb/>la palla C, nelghiaccio, per trattener l’acqua di eſſa in iſtato di <lb/>maſsimo ristrignimento. </s>
  <s xml:id="echoid-s3504" xml:space="preserve">Sia queſto nel punto E, oltre il quale cer-<lb/>cherà di comprimerla il cilindro d’aria GE ridotto all eftrema den-<lb/>ſita dalla forza dell’acqua ſormontata in G, per la rarefattione o-<lb/>perata in lei da lcalor dell’ acqua, che ſi ſuppone bollire attualme-<lb/>mente intorno allapalla B. </s>
  <s xml:id="echoid-s3505" xml:space="preserve">Ora ſe l’acqua patiſce compreſsione <lb/>dourà cedere di qualcbe grado al cilindro d’aria premente, abbaſ-<lb/>ſandoſi ſotto il punto E; </s>
  <s xml:id="echoid-s3506" xml:space="preserve">Ma a noi è ſucceduto al@rimenti, perche <lb/>quand@ l’acqua in E, è stala veramente ridotta allo ſtato del ſu@ <lb/>maſsimo riſtrignimento, la forza dell aria GE, premente non à gua-<lb/>dagnato nulla, e innanzi à fatto crepar’il fondo della palla C, che’ <lb/>ritirare vn pelo il liuello E. </s>
  <s xml:id="echoid-s3507" xml:space="preserve">E quando, per a@@reſcer maggior fer-<lb/>mezza allo ſtrumento, abbiamo fatte le due palle di rame, nondime-<lb/>no l’acqua della palla C, à retto trà la ſaldezza del metallo, e l mo-<lb/>mento della forza premente con inſuperabile reſ@tenza in E, fa-<lb/>cendo più to ſto ſcoppiare il ſifone, &amp;</s>
  <s xml:id="echoid-s3508" xml:space="preserve">c.</s>
  <s xml:id="echoid-s3509" xml:space="preserve"/>
</p>
<div xml:id="echoid-div28" type="float" level="2" n="2">
  <figure xlink:label="fig-00120-01" xlink:href="fig-00120-01a">
    <image file="00120-01" xlink:href="http://echo.mpiwg-berlin.mpg.de/zogilib?fn=/permanent/library/9EXVCG1R/figures/00120-01"/>
  </figure>
</div>
<p>
  <s xml:id="echoid-s3510" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s3511" xml:space="preserve">Deue ſapere Sig. </s>
  <s xml:id="echoid-s3512" xml:space="preserve">Ofredi, che quelli corpi, li quali mani-<lb/>feſtamehte ſoggiacciono alla compreſſione, quale è l’aria <lb/>noſtra, non ci laſciano veder creſcer queſta con quell’in-<lb/>cremento, che creſce la forza premente. </s>
  <s xml:id="echoid-s3513" xml:space="preserve">Pei eſempio, <lb/>premendoſi l’aria, che riempie vn vaſo con 4. </s>
  <s xml:id="echoid-s3514" xml:space="preserve">gradi di for-<lb/>za, ſiriſiringa in ſpazio vn decimo minore del primo, fe <lb/>premeraſſi con gradi 8. </s>
  <s xml:id="echoid-s3515" xml:space="preserve">di forza, non ſi riſtringerà già in <lb/>ſpatio minore del primo due decirni, ma meno; </s>
  <s xml:id="echoid-s3516" xml:space="preserve">e cio ſem-<lb/>pre tanto meno, quanto più ſarà condenſata. </s>
  <s xml:id="echoid-s3517" xml:space="preserve">Sì che <lb/>ſe con 100. </s>
  <s xml:id="echoid-s3518" xml:space="preserve">gradi di forza foſſe già riſtretta quattro deci-<lb/>mi, può eſſere che con 400. </s>
  <s xml:id="echoid-s3519" xml:space="preserve">non ſiriſtringa vn altro de-<lb/>cimo.</s>
  <s xml:id="echoid-s3520" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3521" xml:space="preserve">_Ofr_. </s>
  <s xml:id="echoid-s3522" xml:space="preserve">Queſta dottrina l hò per certiſſima; </s>
  <s xml:id="echoid-s3523" xml:space="preserve">hauendo oſſeruato <lb/>quando ſi gioca al pallone, che riempito, e gonfio che ſia <lb/>competentemente, ſe bene queſto ſi dilata ſempre più <lb/>per ogni ſchizzetatta, nulladimeno a farcene entrare vna <lb/>di nuouo vi vuole vna grādiſſima forza, &amp; </s>
  <s xml:id="echoid-s3524" xml:space="preserve">a pena ſe può ot-<lb/>tener l’in tento. </s>
  <s xml:id="echoid-s3525" xml:space="preserve">Onde ſe l’acqua (al noſtro propoſito) foſſe <lb/>per altro accidente riſtrettiſſima, vi vorrebbono altro che
<pb o="28" file="00122" n="122" rhead="DIALOCO"/>
Neſpole à riſtringerla di nuouo tanto che ſi poteſſe ve-<lb/>dere.</s>
  <s xml:id="echoid-s3526" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3527" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s3528" xml:space="preserve">Hora di queſta ſorte è l’acqua contenuta nella palla C, <lb/>dicend o eſſi _nella pag. </s>
  <s xml:id="echoid-s3529" xml:space="preserve">200. </s>
  <s xml:id="echoid-s3530" xml:space="preserve">ſeguitando però à tene’ ſempre im-_ <lb/>_merſa la palla C, nel ghiaccio, per trattener l’acqua d eſſa in inſta-_ <lb/>_to di maſsimo ristrengimento_. </s>
  <s xml:id="echoid-s3531" xml:space="preserve">Se è riſtretta maſſimamente, <lb/>conſideri Signor Ofredi qual forza ſaria neceſſario ado-<lb/>prare per riſtringerla tanto che ſi vedeſſe.</s>
  <s xml:id="echoid-s3532" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3533" xml:space="preserve">In oltre, è certiſſimo che la natura procura d’ottenere ſem-<lb/>pre il ſuo fine con li mezzi più facili. </s>
  <s xml:id="echoid-s3534" xml:space="preserve">Se vna veſcica gon-<lb/>fia d’aria ſi ponerà ſopra queſto pauimento, e ſopra ſe li <lb/>ponerà qualche notabil peſo, queſto la riſtringerà qual-<lb/>che poco; </s>
  <s xml:id="echoid-s3535" xml:space="preserve">ma ſe prima foſſe veſtita, e circondata con ſpun-<lb/>ga, bambace, e ſimili corpi riſtrettibili, il peſo riſtringereb-<lb/>be prima queſti, e l’aria della veſcica ò nulla, ò aſſai meno <lb/>di prima.</s>
  <s xml:id="echoid-s3536" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3537" xml:space="preserve">_Ofr_. </s>
  <s xml:id="echoid-s3538" xml:space="preserve">In ciò non hò dubio alcuno.</s>
  <s xml:id="echoid-s3539" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3540" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s3541" xml:space="preserve">Nel noſtro caſo adunque, quello che deue comprimer @-<lb/>acqua della palla C, è l’aria del ſifone DAE, ſpinta dalla <lb/>rarefattione dell’acqua della palla B; </s>
  <s xml:id="echoid-s3542" xml:space="preserve">la quale aria ſe bene <lb/>per lo ſtrofinamento del ghiaccio è più condenſata di <lb/>quello che ſarebbe naturalmente, nulladimeno non è ri-<lb/>ftretta quanto puole. </s>
  <s xml:id="echoid-s3543" xml:space="preserve">Prima adunque di premere ſopra <lb/>l’acqua C, ſi riſtringerà<unsure/> eſſa di molto. </s>
  <s xml:id="echoid-s3544" xml:space="preserve">Onde non premerà <lb/>ſopra l’acqua C, con tutta quella forza, con la quale pre-<lb/>merebbe quando non patiſce ſimil condenſatione.</s>
  <s xml:id="echoid-s3545" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3546" xml:space="preserve">_Ofr_. </s>
  <s xml:id="echoid-s3547" xml:space="preserve">Preme però molto, mentre eſſi auuertiſcono, che eſſen-<lb/>do la palla C, di Criſtallo, l’hà fatta crepare, &amp; </s>
  <s xml:id="echoid-s3548" xml:space="preserve">eſſendo di <lb/>rame, hà fatto crepare il ſifone.</s>
  <s xml:id="echoid-s3549" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3550" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s3551" xml:space="preserve">Tanto credo. </s>
  <s xml:id="echoid-s3552" xml:space="preserve">La ſeconda eſperienza è molto bella;</s>
  <s xml:id="echoid-s3553" xml:space="preserve">e mi <lb/>rimetto al giuditio, che eſſi ne formano. </s>
  <s xml:id="echoid-s3554" xml:space="preserve">Sopra la terza ſi <lb/>può fare qualche conſideratione. </s>
  <s xml:id="echoid-s3555" xml:space="preserve">Fecero gettare vna <lb/>gran palla d’argento, ma aſſaiſottile, della quale habbia-<lb/>mo parlato di ſopra à carte 12. </s>
  <s xml:id="echoid-s3556" xml:space="preserve">e riempitola d’acqua <lb/>molto raffreddata con il ghiaccio, la ſerrorno ſaldiſſima-<lb/>mente con vite; </s>
  <s xml:id="echoid-s3557" xml:space="preserve">poi principiorno à martellarla in più luo-<lb/>ghi, &amp; </s>
  <s xml:id="echoid-s3558" xml:space="preserve">ammaccarla. </s>
  <s xml:id="echoid-s3559" xml:space="preserve">Dicono che _ad ogni colpo ſi vedeua tra-_ <lb/>_ſudare per li pori del metallo_. </s>
  <s xml:id="echoid-s3560" xml:space="preserve">Il che, dicono, non ſarebbe ſuc-
<pb o="29" file="00123" n="123" rhead="TERZO."/>
ceſſo, quando l’acqua haueſſe patito qualche compreſsio-<lb/>ne.</s>
  <s xml:id="echoid-s3561" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3562" xml:space="preserve">_Cont_. </s>
  <s xml:id="echoid-s3563" xml:space="preserve">Certo, che mentre la sfera è dimoſtrata dalli Geometri <lb/>più capace di tutti li corpi iſoperimetri, cioè del medemo <lb/>ambito, quando per l’am maccatura l’argento non ſi eſten-<lb/>deſſe, &amp; </s>
  <s xml:id="echoid-s3564" xml:space="preserve">aſſottigliaſſe, biſognerà confeſſare che la palla <lb/>ammaccata facendoſi meno capace, l’acqua ſi riſtringeſſe, <lb/>quando che non vſciſſe.</s>
  <s xml:id="echoid-s3565" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3566" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s3567" xml:space="preserve">Hanno fatto la palla d’argento, perche, dicono eſsi, che <lb/>_queſto per la ſua crudezza non cõporta d’aſſottigliarſi, e diſtenderſi_ <lb/>_come farebbe l’oro raffinato, òil piombo ò altro metallo più dolce._</s>
  <s xml:id="echoid-s3568" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3569" xml:space="preserve">_@ont_. </s>
  <s xml:id="echoid-s3570" xml:space="preserve">Deuono intender che l’argento non s’aſſottigli coſi <lb/>prontamente quanto li predetti metalli, e non aſſoluta-<lb/>mente, perche pur eſſo ſi rende alle martellate.</s>
  <s xml:id="echoid-s3571" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3572" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s3573" xml:space="preserve">Intorno a queſt’eſperienza ſi può conſiderare, che ſe be-<lb/>ne è vero, che l’acqua patiſca qualche compreſsione, nul-<lb/>ladimeno che fà tutti li sforzi per sfuggirla;</s>
  <s xml:id="echoid-s3574" xml:space="preserve">e perciò ritro-<lb/>uando la ſtrada più facile, cioè li pori del metallo, traſuda <lb/>per eſsi. </s>
  <s xml:id="echoid-s3575" xml:space="preserve">Se prenderemo paſta, creta, e ſimile materie, e le <lb/>comprimeremo con le mani, e procureremo ſtringerle trà <lb/>eſſe, più toſto che riſtringerſi vſciranno per le ſiſſure delli <lb/>diti, ma ſe non potranno vſcire, biſognerà che cedino alla <lb/>compreſsione. </s>
  <s xml:id="echoid-s3576" xml:space="preserve">Aggiuta anco la traſudatione per li pori, e <lb/>la ſottigliezza dell’argento, e la ſomma conſtipatione del-<lb/>l’acqua cagionata dal freddo del ghiaccio;</s>
  <s xml:id="echoid-s3577" xml:space="preserve">la quale renden-<lb/>dola tanto più contumace al maggiore riſtrengimento, è <lb/>cauſa che facia maggior forza per entrar nelli pori.</s>
  <s xml:id="echoid-s3578" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3579" xml:space="preserve">@@i più, mi ſarei volentieri ritrouato preſente à queſt’eſpe-<lb/>rienza, per notare ſe ad ogni ammaccatura l’ acqua traſu-<lb/>daua tutta in vna volta, &amp; </s>
  <s xml:id="echoid-s3580" xml:space="preserve">in vn inſtante ò pure ſucceſsiua-<lb/>mente, &amp; </s>
  <s xml:id="echoid-s3581" xml:space="preserve">in tempo. </s>
  <s xml:id="echoid-s3582" xml:space="preserve">Perche in queſto ſecondo caſo non ſi <lb/>può negare qualche condenſatione per quel tempo, ma <lb/>che procurando l’acqua liberarſi da eſſa, traſudaſse poi.</s>
  <s xml:id="echoid-s3583" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3584" xml:space="preserve">_@nt_. </s>
  <s xml:id="echoid-s3585" xml:space="preserve">Parmi che il Gaſsendo riferiſca vna ſimile eſperienza, e <lb/>dica che ammaccata la palla, e fatto in eſſa vn piccolo fo-<lb/>rame, da eſſo, come da vn ſpinello vſcì fuori dell’acqua; </s>
  <s xml:id="echoid-s3586" xml:space="preserve">in-<lb/>ditio manifeſtiſſimo della compreſsione, e conſtipatione, <lb/>che patiua.</s>
  <s xml:id="echoid-s3587" xml:space="preserve"/>
</p>
<pb o="30" file="00124" n="124" rhead="DIALOGO"/>
<p>
  <s xml:id="echoid-s3588" xml:space="preserve">_Ofr_. </s>
  <s xml:id="echoid-s3589" xml:space="preserve">Et à me pare d’hauer letto, che diſceſo vn tale molto<gap/> <lb/>ſotto acqua, &amp; </s>
  <s xml:id="echoid-s3590" xml:space="preserve">iui riempita vn ampollina, che haueua vn <lb/>bucco aſſai auguſto, di quell’acqua, &amp; </s>
  <s xml:id="echoid-s3591" xml:space="preserve">otturatala ben bene@ <lb/>che venuto ſopra acqua, hauendola aperta, n’vſcì viſibil-<lb/>mente dell’acqua, rimanendo piena l’ampollina. </s>
  <s xml:id="echoid-s3592" xml:space="preserve">Dal che<gap/> <lb/>certo ſi raccoglierebbe che l’acqua più fonda foſse più ri-<lb/>ſtretta.</s>
  <s xml:id="echoid-s3593" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3594" xml:space="preserve">_Cont_. </s>
  <s xml:id="echoid-s3595" xml:space="preserve">Anco con il peſo hauerebbe queſti potuto conoſcere <lb/>queſta verità; </s>
  <s xml:id="echoid-s3596" xml:space="preserve">perche quella ampollina riempita con <lb/>quell’acqua del fondo, haurebbe più peſato, che riempita<gap/> <lb/>d’acqua nella cima di eſ@a.</s>
  <s xml:id="echoid-s3597" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3598" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s3599" xml:space="preserve">Si quando foſsimo ſicuri che tutta l’acqua fo ſse homo-<lb/>genea in grauità il che difficilmente ſarà, mentre la più <lb/>fonda è più contaminata per lo più da cor puſcoli graui iu<gap/> <lb/>diſceſi. </s>
  <s xml:id="echoid-s3600" xml:space="preserve">Che che ſia di queſte eſperienze, à me certo non <lb/>baſta l’animo di negare all’acqua, &amp; </s>
  <s xml:id="echoid-s3601" xml:space="preserve">altri liquidi qualche<gap/> <lb/>riſtrengimento, e compre lsione; </s>
  <s xml:id="echoid-s3602" xml:space="preserve">la quale pero ſara ſempre<gap/> <lb/>tanto minore, e meno oſseruabile, quanto più gia laranno<gap/> <lb/>compreſsi, e riſtretti per freddo, o altro accidente eſtrinſe <lb/>co. </s>
  <s xml:id="echoid-s3603" xml:space="preserve">Poiche anco l’aria noſtra, la quale patiſce tanta com <lb/>preſsione che ſe riduce à ſpatio ſino 15. </s>
  <s xml:id="echoid-s3604" xml:space="preserve">volte minore de<gap/> <lb/>ſuo naturale, chi tentaſse com preſsa che così foſse, com<gap/> <lb/>primerla di più s’affaticarebbe forſe in vano. </s>
  <s xml:id="echoid-s3605" xml:space="preserve">Non però<gap/> <lb/>potrebbe queſti dire che l aria non ſoggiaceſse al riſtrin<gap/> <lb/>gimento.</s>
  <s xml:id="echoid-s3606" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3607" xml:space="preserve">_Ofr_. </s>
  <s xml:id="echoid-s3608" xml:space="preserve">Molte parole habbia mo fatte queſta mane; </s>
  <s xml:id="echoid-s3609" xml:space="preserve">ne però V.</s>
  <s xml:id="echoid-s3610" xml:space="preserve">S<gap/> <lb/>hà ſin’ad hora pagato pur vno delli luoi debiti, pe riſcuote<gap/> <lb/>li quali ſono quà venuto con il Signor Conte E perche gi@ <lb/>è hora di pagarne al ſtomaco vno di maggior im portan<gap/> <lb/>za, à riuederſi hoggi.</s>
  <s xml:id="echoid-s3611" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3612" xml:space="preserve">_Mat_, L’attenderò con impacienza.</s>
  <s xml:id="echoid-s3613" xml:space="preserve"/>
</p>
</div>
<div xml:id="echoid-div30" type="section" level="1" n="19">
<head xml:id="echoid-head31" xml:space="preserve">Fine del Terzo Dialogo.</head>
<pb o="31" file="00125" n="125"/>
</div>
<div xml:id="echoid-div31" type="section" level="1" n="20">
<head xml:id="echoid-head32" xml:space="preserve">DIALOGO <lb/>QVARTO.</head>
<p>
  <s xml:id="echoid-s3614" xml:space="preserve">_M_.</s>
  <s xml:id="echoid-s3615" xml:space="preserve">SE bene dice il prouerbio, al pagar <lb/>non eſſer corrente, perche potria venir <lb/>qualche accidente, che tù non pagaſſ@ <lb/>niente, nulladimeno hò atteſo miei Si-<lb/>gnori la loro venuta con vna inquietez-<lb/>za grandiſſima, per ſodisfare à miei de-<lb/>biti dal Signor Ofredi preteſi. </s>
  <s xml:id="echoid-s3616" xml:space="preserve">In gratia <lb/>non mi diano più la corda, ma principi-<lb/>no à sfo drare le loro pretenſioni.</s>
  <s xml:id="echoid-s3617" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3618" xml:space="preserve">_Ofr_ Il primo ſuo debito è vn’eſperienza da V. </s>
  <s xml:id="echoid-s3619" xml:space="preserve">S. </s>
  <s xml:id="echoid-s3620" xml:space="preserve">arreccata nel <lb/>_p. </s>
  <s xml:id="echoid-s3621" xml:space="preserve">Dial. </s>
  <s xml:id="echoid-s3622" xml:space="preserve">pag. </s>
  <s xml:id="echoid-s3623" xml:space="preserve">15_. </s>
  <s xml:id="echoid-s3624" xml:space="preserve">in materia d’vn bicchiere, ò vaſo pieno d’aria, <lb/>ſommerſo nell’acqua con la bocca all’ingiù.</s>
  <s xml:id="echoid-s3625" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3626" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s3627" xml:space="preserve">Se V. </s>
  <s xml:id="echoid-s3628" xml:space="preserve">S. </s>
  <s xml:id="echoid-s3629" xml:space="preserve">m’aſcriue à debito l’hauer detto, che quanto più <lb/>s’immerge il bicchiere, ò vaſo, tanto ſi fà minor fatica, con-<lb/>tro quello, che pare che affermi il Dottiſſimo P. </s>
  <s xml:id="echoid-s3630" xml:space="preserve">Fabris nel <lb/>luogo iui citato, ſe non haueſſi altri debiti ſarei felice, men-<lb/>tre queſta è coſa notiſſima</s>
</p>
<p>
  <s xml:id="echoid-s3631" xml:space="preserve">_Ofre_. </s>
  <s xml:id="echoid-s3632" xml:space="preserve">Non in queſto conſiſte il ſuo debito. </s>
  <s xml:id="echoid-s3633" xml:space="preserve">Hauerò però piace-<lb/>re di ſentire come queſta ſia coſa tanto triuiale.</s>
  <s xml:id="echoid-s3634" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3635" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s3636" xml:space="preserve">Io credo che loro Signori haueranno veduto più volte li <lb/>Ciarlatani tener in mano vn’ampolla, ò carafa piena d’ac-<lb/>qua, e dentro alcune palline vuote di vetro lauorate alla <lb/>lucerna, con vn bucchetto, &amp; </s>
  <s xml:id="echoid-s3637" xml:space="preserve">vn poco di collo, che eſſen-<lb/>do iui più groſſo, &amp; </s>
  <s xml:id="echoid-s3638" xml:space="preserve">in conſeguenza più graue che altroue, <lb/>le laſcia bene galleggiar nell’acqua, ma con queſto collo <lb/>immerſo, &amp; </s>
  <s xml:id="echoid-s3639" xml:space="preserve">all’ingiù: </s>
  <s xml:id="echoid-s3640" xml:space="preserve">attaccandogli pure alle volte figuri-<lb/>ne di vetro lauorate alla lucerna, che rapreſentano Sirene, <lb/>Diauoli, Angeli, &amp; </s>
  <s xml:id="echoid-s3641" xml:space="preserve">altre coſe per render maggior ſtupore <lb/>alli merlotti. </s>
  <s xml:id="echoid-s3642" xml:space="preserve">Hora galleggiando queſte palline, come <lb/>quelle, che con l’aria, che contengono fanno vn compo-<lb/>ſto più leggiero in ſpecie dell’acqua, premono queſti con <lb/>il popiſtrello del dito pollice ſopra l’acqua della carafa; </s>
  <s xml:id="echoid-s3643" xml:space="preserve">c
<pb o="32" file="00126" n="126" rhead="DIALOGO"/>
ſecondo la maggior, ò minor preſſione ſi vedono diſcende-<lb/>re, ò alcune, ò tutte queſte palline, chi più, chi meno, chi <lb/>ſino al fondo; </s>
  <s xml:id="echoid-s3644" xml:space="preserve">dal quale anco, rallentandoſi la preſſione <lb/>del dito, ſi vedono riſalire, chi più, chi meno, chi ſino à gal-<lb/>leggiare, ſecondo che più, e più ſi rallenta la preſſione.</s>
  <s xml:id="echoid-s3645" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3646" xml:space="preserve">_Ofr._ </s>
  <s xml:id="echoid-s3647" xml:space="preserve">Et hò fatto io più volte queſto giochetto, e sò anco la <lb/>cauſa, che ne viene aſſegnata comunemente. </s>
  <s xml:id="echoid-s3648" xml:space="preserve">Premendoſi <lb/>l’acqua della carafa con il dito (che però otturi la bocca <lb/>ben bene) queſta ò non patendo compreſſione alcuna, ò <lb/>patendone qualche poco, non però quando habbia doue <lb/>cacciarſi, entra per quelli buccolini nelle palliue a propor-<lb/>tione della preſſione; </s>
  <s xml:id="echoid-s3649" xml:space="preserve">e con il ſuo ingreſſo comprimendo <lb/>l’aria contenuta entro alle palline, fa vn compoſto, ò vgual-<lb/>mente graue in ſpecie con l’acqua, ò più: </s>
  <s xml:id="echoid-s3650" xml:space="preserve">e perciò ſi vedo-<lb/>no tutte quelle varietà. </s>
  <s xml:id="echoid-s3651" xml:space="preserve">Anzi che ben ſpeſſo quando la <lb/>preſſione è molto gagliarda, e le palline ſono aſſai graui <lb/>per ſe ſteſſe, ſi che poco differiſchino dall’acqua, entra in <lb/>eſſe tanta quantità di queſta, che anco ralentata la preſſio-<lb/>ne, non perciò vſcendo l’acqua da eſſe, perſiſtono nel <lb/>fondo; </s>
  <s xml:id="echoid-s3652" xml:space="preserve">ne ſono più atte al gioco ſino che non ſi caui da <lb/>eſſe detta aqua.</s>
  <s xml:id="echoid-s3653" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3654" xml:space="preserve">_Mat._ </s>
  <s xml:id="echoid-s3655" xml:space="preserve">Queſta eſperienza dimoſtra manifeſtamente che nel bic-<lb/>chiere, ò vaſo quanto più fondo ſi ſommerge, tanto ſi pro-<lb/>ua minor fatica nel tenerlo fermo acciò non riſaliſca. </s>
  <s xml:id="echoid-s3656" xml:space="preserve">Per-<lb/>che pure in eſſo può entrare tant’acqua, che l’aggregato <lb/>d’eſſa, vaſo, &amp; </s>
  <s xml:id="echoid-s3657" xml:space="preserve">aria riſtretta, poſto entro l’acqua, ſia, ò <lb/>vgualmente graue in ſpecie con eſſa, ò più, nel qual caſo è <lb/>manifeſto, che non ſi farebbe fatica alcuna. </s>
  <s xml:id="echoid-s3658" xml:space="preserve">Immergendo <lb/>adunque più, e più il bicchiere, caminaſi ſempre più à ren-<lb/>derlo, e graue come l’acqua, e più. </s>
  <s xml:id="echoid-s3659" xml:space="preserve">Adunque ſempre ſi <lb/>rende più graue, e ſempre ſi fà minor fatica.</s>
  <s xml:id="echoid-s3660" xml:space="preserve"/>
</p>
<p style="it">
  <s xml:id="echoid-s3661" xml:space="preserve">Cont. </s>
  <s xml:id="echoid-s3662" xml:space="preserve">_Vn eſperienza ſimile porta il dottiſſimo Claudio Beri-_ <lb/>_gardo, gia Filoſofo primario di queſto Studio_, nel ſuo Circo-<lb/>lo Piſano par. </s>
  <s xml:id="echoid-s3663" xml:space="preserve">3. </s>
  <s xml:id="echoid-s3664" xml:space="preserve">circ. </s>
  <s xml:id="echoid-s3665" xml:space="preserve">6. </s>
  <s xml:id="echoid-s3666" xml:space="preserve">pag. </s>
  <s xml:id="echoid-s3667" xml:space="preserve">294. </s>
  <s xml:id="echoid-s3668" xml:space="preserve">ſit columna vitrea, _dice egli_ caua, <lb/>altitudine vnius pedis, diametro trium digitorum, aquæ plena. <lb/></s>
  <s xml:id="echoid-s3669" xml:space="preserve">Fiat vaſculum vitreum rotundum magnitudine nucis maiuſculæ, <lb/>ſed ita compreſſum, vt minor diameter altitudinem referens ſit <lb/>vnius digiti, maior verò latitudinem referens ſit duorum, paulò
<pb o="33" file="00127" n="127" rhead="QVARTO."/>
craſſius in illa parte, quæ deorſum ſpectare debet, in qua ſit oſculum <lb/>magnitudine lentis per quod tantum aquæ demittatur intra vaſcu-<lb/>lum, vt illud demerſum ad mediam columnam ibi conſiſtat immobi-<lb/>le. </s>
  <s xml:id="echoid-s3670" xml:space="preserve">Tunc ſi paulò ſupra medium attollitur, ſpontè aſcendit ad ſu-<lb/>perficiem aquæ ſi verò paulò infra medium deprimatur ſpontè ad <lb/>fundum columnæ delabitur; </s>
  <s xml:id="echoid-s3671" xml:space="preserve">vnde ſi rursùs ad medium columnæ re-<lb/>uocatur ibi conſiſtit.</s>
  <s xml:id="echoid-s3672" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3673" xml:space="preserve">_Mat._ </s>
  <s xml:id="echoid-s3674" xml:space="preserve">Vedo che la cauſa è la medema, che ſopra habbiamo det-<lb/>to militare e nell’altra carafa e nel bicchiere, o vaſo.</s>
  <s xml:id="echoid-s3675" xml:space="preserve"/>
</p>
<p style="it">
  <s xml:id="echoid-s3676" xml:space="preserve">Cont. </s>
  <s xml:id="echoid-s3677" xml:space="preserve">_Sì ma il Berigardo l’aſſegna diuerſa dall’addotta da V. </s>
  <s xml:id="echoid-s3678" xml:space="preserve">S._ <lb/></s>
  <s xml:id="echoid-s3679" xml:space="preserve">_Dice adunque_. </s>
  <s xml:id="echoid-s3680" xml:space="preserve">Ratio cur bæret in medio eſſe videtur, quod to-<lb/>tum compoſitum ex aere &amp; </s>
  <s xml:id="echoid-s3681" xml:space="preserve">vitro in medio conſiſtens eſt eiuſdem <lb/>ponderis atque aqua eiuſdem molis. </s>
  <s xml:id="echoid-s3682" xml:space="preserve">Si paulùm deprimitur, aer ma-<lb/>gis compreſſus ob violentum deſcenſum minorem locum occupat, &amp; </s>
  <s xml:id="echoid-s3683" xml:space="preserve"><lb/>intra vaſc lum plus aquæ admittit vnde totum compoſitum ex aere <lb/>&amp; </s>
  <s xml:id="echoid-s3684" xml:space="preserve">vitro fit grauiùs aqua eiuſdem molis. </s>
  <s xml:id="echoid-s3685" xml:space="preserve">Atque ob contrariam ra-<lb/>tionem, quando vaſculum paulò ſupra medium columnæ attollitur, <lb/>aere dilatato compoſitum ex aere &amp; </s>
  <s xml:id="echoid-s3686" xml:space="preserve">vitro leuiùs eſt aqua eiuſdem <lb/>molis &amp; </s>
  <s xml:id="echoid-s3687" xml:space="preserve">propterea ad ſuperficiem reuocatur.</s>
  <s xml:id="echoid-s3688" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3689" xml:space="preserve">La medema cauſa aſfegna il noſtro grand’amico, &amp; </s>
  <s xml:id="echoid-s3690" xml:space="preserve">inſigne <lb/>Filoſofo, e Matematico, dico il Signor Rinaldini nel caſo <lb/>del bicchiere che pur’egli conſidera _nel lib. </s>
  <s xml:id="echoid-s3691" xml:space="preserve">primo de Reſ &amp;_</s>
  <s xml:id="echoid-s3692" xml:space="preserve"> <lb/>_Compoſ. </s>
  <s xml:id="echoid-s3693" xml:space="preserve">Mat pag._ </s>
  <s xml:id="echoid-s3694" xml:space="preserve">179. </s>
  <s xml:id="echoid-s3695" xml:space="preserve">dicendo _Quod ex eo planè cuique conſtabit_ <lb/>_aduertenti longè difficiliùs impelli deorſum cyatum inuerſum in bu-_ <lb/>_midum initio quàm poſtea immerſionis decurſu; </s>
  <s xml:id="echoid-s3696" xml:space="preserve">eam ob cauſam,_ <lb/>_quia aer intra cy@tum incipit conſtipari ab humido ſubtus occur-_ <lb/>_rente cyato deorſum pulſo; </s>
  <s xml:id="echoid-s3697" xml:space="preserve">tunc autem cum factum ſit totum corpus_ <lb/>_grauius in ſpecie non reſiſtit prementis manui, vnde nulla in immer-_ <lb/>_ſionis progreſſu reſiſtentia percipitur._ </s>
  <s xml:id="echoid-s3698" xml:space="preserve">Vogliono adunque que-<lb/>ſti Signori che tutto ciò prouenga dall’aria, e vetro, e non <lb/>in conto alcuno dall’acqua, che ſia entrata nel vaſo, che <lb/>aggiunga grauita, come diceua V. </s>
  <s xml:id="echoid-s3699" xml:space="preserve">S. </s>
  <s xml:id="echoid-s3700" xml:space="preserve">la quale non vogliono <lb/>che ſi conſideri in conto alcuno.</s>
  <s xml:id="echoid-s3701" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3702" xml:space="preserve">_Mat._ </s>
  <s xml:id="echoid-s3703" xml:space="preserve">lo dubito Signor Conte che V.</s>
  <s xml:id="echoid-s3704" xml:space="preserve">S. </s>
  <s xml:id="echoid-s3705" xml:space="preserve">non aggraui queſti Si-<lb/>gnori di molto, volendo che dicono vna coſa, la quale non <lb/>dicono eſpreſſamente. </s>
  <s xml:id="echoid-s3706" xml:space="preserve">Per intender meglio il negotio v’è <lb/>neceſſario qualche ſchema, però eſemplifichi ſopra <lb/>queſto.</s>
  <s xml:id="echoid-s3707" xml:space="preserve"/>
</p>
<pb o="34" file="00128" n="128" rhead="DIALOCO"/>
<p>
  <s xml:id="echoid-s3708" xml:space="preserve">_Cont._ </s>
  <s xml:id="echoid-s3709" xml:space="preserve">Sia il vaſo A B C, il quale dopò la total immerſione <lb/>preciſa non contenga altro che aria (perche ſino a queſto <lb/>ſegno ſe v entrerà acqua ſarà in ſenſibile.) </s>
  <s xml:id="echoid-s3710" xml:space="preserve">Queſti ſr para-<lb/>gona con tant’acqua quanta è tuttala ſua mole; </s>
  <s xml:id="echoid-s3711" xml:space="preserve">e nor nel <lb/>tenerlo dobbiamo ſentire tutto l’ecceſſo di queſta ſopra il <lb/>peſo del vetro, &amp; </s>
  <s xml:id="echoid-s3712" xml:space="preserve">aria. </s>
  <s xml:id="echoid-s3713" xml:space="preserve">S’immerga di più di quello che era <lb/>prima ſecondo tutta la ſua altezza, &amp; </s>
  <s xml:id="echoid-s3714" xml:space="preserve">in queſta immerſio-<lb/>ne maggiore ſia entrata dentro l’acqua A D E C, e tutta <lb/>laria ſi ſia riſfretta in D B E. </s>
  <s xml:id="echoid-s3715" xml:space="preserve">Dico che il vetro, e l’aria <lb/>D B E, ſara più graue in ſpecie, che il medemo vetro, &amp; </s>
  <s xml:id="echoid-s3716" xml:space="preserve"><lb/>aria A B C. </s>
  <s xml:id="echoid-s3717" xml:space="preserve">Et auuerta V.</s>
  <s xml:id="echoid-s3718" xml:space="preserve">S. </s>
  <s xml:id="echoid-s3719" xml:space="preserve">che dico più graue in ſpecie, e <lb/>non aſſolutamente, cioè di grauita aſſoluta; </s>
  <s xml:id="echoid-s3720" xml:space="preserve">perche sò <lb/>anch io, che traſportato nel vacuo il vetro con l’aria con-<lb/>denſata D B E, &amp; </s>
  <s xml:id="echoid-s3721" xml:space="preserve">il medemo vetro con l’aria naturale <lb/>A B C, che peſeriano il medemo. </s>
  <s xml:id="echoid-s3722" xml:space="preserve">Anzi che il peſare il <lb/>medemo aſſolutamenre è cagione che ſiano di differente <lb/>grauità ſpecifica, che è quella grauità, che eſercitano nel-<lb/>l’acqua. </s>
  <s xml:id="echoid-s3723" xml:space="preserve">E la ragione è queſta. </s>
  <s xml:id="echoid-s3724" xml:space="preserve">Nel primo caſo il vaſo, e <lb/>l’aria A B C, ſi paragonano con tant’acqua quanta e tutta <lb/>la loro mole, onde ſe l’acqua peſa, per eſempio, libbre 4. </s>
  <s xml:id="echoid-s3725" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s3726" xml:space="preserve"><lb/>il vetro, &amp; </s>
  <s xml:id="echoid-s3727" xml:space="preserve">aria libbre 1. </s>
  <s xml:id="echoid-s3728" xml:space="preserve">noinel tenerlo ſentiremo @@mpul-<lb/>ſo de libbre trè Ma ſe l’acqua entrata A D E C, peſaſſe lib-<lb/>bre 2; </s>
  <s xml:id="echoid-s3729" xml:space="preserve">l’acqua, che ſi paragoneria con il vetro, &amp; </s>
  <s xml:id="echoid-s3730" xml:space="preserve">aria con-<lb/>denſata D B E, non ſaria piuranta quanta è tutta la mole <lb/>A B C, ma tanta ſolamente, quanto ſarebbe il vetro, &amp; </s>
  <s xml:id="echoid-s3731" xml:space="preserve"><lb/>aria D B E; </s>
  <s xml:id="echoid-s3732" xml:space="preserve">la quale peſando libbre 2. </s>
  <s xml:id="echoid-s3733" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s3734" xml:space="preserve">il vetro, &amp; </s>
  <s xml:id="echoid-s3735" xml:space="preserve">aria lib <lb/>bre noi non ſentire ſſimo che l’impulſo d’vna libbra. </s>
  <s xml:id="echoid-s3736" xml:space="preserve">Ec <lb/>co adunque che il vetro, &amp; </s>
  <s xml:id="echoid-s3737" xml:space="preserve">aria D B E, ſono più graun in <lb/>ſpecie del medemo vetro, &amp; </s>
  <s xml:id="echoid-s3738" xml:space="preserve">aria A B C. </s>
  <s xml:id="echoid-s3739" xml:space="preserve">Non è adunque <lb/>vero quello che diceua V.</s>
  <s xml:id="echoid-s3740" xml:space="preserve">S. </s>
  <s xml:id="echoid-s3741" xml:space="preserve">cioè che la cagione ſia perche <lb/>l’acqua A D E C, peſi, e che ſi ponga vn’aggregato di ve-<lb/>tro, aria, &amp; </s>
  <s xml:id="echoid-s3742" xml:space="preserve">acqua, mentre nel primo caſo ſi collocaua nel-<lb/>l’acqua vn aggregato di vetro, &amp; </s>
  <s xml:id="echoid-s3743" xml:space="preserve">aria.</s>
  <s xml:id="echoid-s3744" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3745" xml:space="preserve">_Ofr._ </s>
  <s xml:id="echoid-s3746" xml:space="preserve">In queſto mio patrone conſiſte vno delli ſuoi debiti.</s>
  <s xml:id="echoid-s3747" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3748" xml:space="preserve">_Mat._ </s>
  <s xml:id="echoid-s3749" xml:space="preserve">Se bene è vero che il vetro cō l’aria D B E, ſia più graue <lb/>in ſpecie del vetro, &amp; </s>
  <s xml:id="echoid-s3750" xml:space="preserve">aria A B C. </s>
  <s xml:id="echoid-s3751" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s3752" xml:space="preserve">anco conceſſo che <lb/>l’aria D B E, poſſa eſſer tanto condenſata, che con il vetro <lb/>facia vna mole, e della medema grauita lpecifica con
<pb o="35" file="00129" n="129" rhead="QVARTO."/>
l’acqua, &amp; </s>
  <s xml:id="echoid-s3753" xml:space="preserve">anco di maggiore, e che queſto accada al vaſetto <lb/>del Sig. </s>
  <s xml:id="echoid-s3754" xml:space="preserve">Berigardo; </s>
  <s xml:id="echoid-s3755" xml:space="preserve">nulladimeno hauendo cōſideratione all’ <lb/>operatione della natura, &amp; </s>
  <s xml:id="echoid-s3756" xml:space="preserve">a quāto accade, dico aſſolutamẽ <lb/>te che biſogna parlare come hò parlato io; </s>
  <s xml:id="echoid-s3757" xml:space="preserve">e che in queſto <lb/>caſo quello, che ſi pone nell’acqua è il vetro ABC, l’aria <lb/>D B E, e l’acqua A D E C; </s>
  <s xml:id="echoid-s3758" xml:space="preserve">e che in turti doi li caſi biſogna <lb/>fare la comparatione con la medema mole d’acqua vguale <lb/>
<anchor type="figure" xlink:label="fig-00129-01a" xlink:href="fig-00129-01"/>
alla mole medema poſta nell’acqua; </s>
  <s xml:id="echoid-s3759" xml:space="preserve">la quale nel primo ca-<lb/>ſo conteueua vetro, &amp; </s>
  <s xml:id="echoid-s3760" xml:space="preserve">aria, e nel ſecondo vetro, aria, &amp; </s>
  <s xml:id="echoid-s3761" xml:space="preserve"><lb/>aqua; </s>
  <s xml:id="echoid-s3762" xml:space="preserve">ma ſempre moli vguali ABC. </s>
  <s xml:id="echoid-s3763" xml:space="preserve">Ne li autori ſopradetti <lb/>dicono eſpreſſamente il contrario come ſi pretende.</s>
  <s xml:id="echoid-s3764" xml:space="preserve"/>
</p>
<div xml:id="echoid-div31" type="float" level="2" n="1">
  <figure xlink:label="fig-00129-01" xlink:href="fig-00129-01a">
    <image file="00129-01" xlink:href="http://echo.mpiwg-berlin.mpg.de/zogilib?fn=/permanent/library/9EXVCG1R/figures/00129-01"/>
  </figure>
</div>
<p>
  <s xml:id="echoid-s3765" xml:space="preserve">_Ofr._ </s>
  <s xml:id="echoid-s3766" xml:space="preserve">Il punto ſtà in far ciò vedere.</s>
  <s xml:id="echoid-s3767" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3768" xml:space="preserve">_Mat._ </s>
  <s xml:id="echoid-s3769" xml:space="preserve">Già Signor Ofredi che V. </s>
  <s xml:id="echoid-s3770" xml:space="preserve">S. </s>
  <s xml:id="echoid-s3771" xml:space="preserve">al vedere non reſta perſuaſa <lb/>che l’acqua nell’acqua grauiti, come habbiamo tanto di-<lb/>ſcorſo nelli noſtri antecedenti Dialogi, ſpero di farle con-<lb/>feſſare il tutto, e con’acquiſto de nuoue cognitioni forſe <lb/>non ſprezzabili.</s>
  <s xml:id="echoid-s3772" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3773" xml:space="preserve">_Ofr._ </s>
  <s xml:id="echoid-s3774" xml:space="preserve">Attenderò l adempimento di queſte promeſſe; </s>
  <s xml:id="echoid-s3775" xml:space="preserve">mà prima <lb/>me dica V. </s>
  <s xml:id="echoid-s3776" xml:space="preserve">S. </s>
  <s xml:id="echoid-s3777" xml:space="preserve">ſupponiamo che A B C, ſia vn gallegiante
<pb o="36" file="00130" n="130" rhead="DIALOG"/>
ſolido, il quale già ſia immetſo nell’acqua; </s>
  <s xml:id="echoid-s3778" xml:space="preserve">perche in te-<lb/>nerlo acciò non aſcenda farà tanta fatica quant’è l’ecceſ-<lb/>ſo della grauità d’vna mole d’acqua vguale ad eſſo, ſopra la <lb/>ſua propria? </s>
  <s xml:id="echoid-s3779" xml:space="preserve">Non è la cagione perche il galleggiante tiene <lb/>ſolleuata quella mole d’acqua ad eſſo vguale, che leuato <lb/>eſſo, diſcenderebbe ad occupar quel luogo?</s>
  <s xml:id="echoid-s3780" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3781" xml:space="preserve">_Mat._ </s>
  <s xml:id="echoid-s3782" xml:space="preserve">Supponga che io riſpondi affirmatiuamente, giache è <lb/>certo tenerla ſolleuata.</s>
  <s xml:id="echoid-s3783" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3784" xml:space="preserve">_Cont._ </s>
  <s xml:id="echoid-s3785" xml:space="preserve">Veda V. </s>
  <s xml:id="echoid-s3786" xml:space="preserve">S. </s>
  <s xml:id="echoid-s3787" xml:space="preserve">quello, che concede, perche è negato ſolen-<lb/>nemente dal noſtro gran Galileo _nelli galleggianti nella pag._ </s>
  <s xml:id="echoid-s3788" xml:space="preserve">8. <lb/></s>
  <s xml:id="echoid-s3789" xml:space="preserve">oue proua, che _la mole dell’acqua che s’al za nell’immerger vn_ <lb/>_priſma, ò cilindro ſolido, ò che s’abbaſſa nell’eſtrarlo, è minore dellæ_ <lb/>_mole di eſſo ſolido demerſa, ò estratta: </s>
  <s xml:id="echoid-s3790" xml:space="preserve">e ad eſſa bà la medema pro-_ <lb/>_portione, che la ſuperficie dell’acqua circunfuſa al ſolido, alla me-_ <lb/>_deſima ſuperficie circunfuſa inſieme con la baſe del ſolido._ </s>
  <s xml:id="echoid-s3791" xml:space="preserve">Per <lb/>eſempio ſia il vaſo A C D, con l’acqua E C N (il qual vaſo <lb/>ſe bene la figura dimoſtra come ſettore, poco importa, po-<lb/>tendolo noi immaginare anco come parallelepipedo ò <lb/>priſma) e ſia il galleggiante B L O D, che pure ſia vn priſ-<lb/>ma, la di cui baſe L O (che ſuppongo vguale alla B D,) ſia <lb/>la metà di tutta l’A D. </s>
  <s xml:id="echoid-s3792" xml:space="preserve">Immaginiamoci queſto priſma fuori <lb/>totalmente dell’acqua, e poniamolo con la baſe L O, ſopra <lb/>l’H N, ſuperficie dell’acqua, premendolo in giù nell’acqua <lb/>ſino che ſia arriuato nel ſito B L O D. </s>
  <s xml:id="echoid-s3793" xml:space="preserve">L’acqua, che ſe ſarà <lb/>ſolleuata ſopra il liuello E H N, ſarà A E H B, non vguale <lb/>à tutto il ſolido, ma alla ſola parte H L O N, che è l’acqua <lb/>ſcacciata, e ſolleuata nel ſito A E H B. </s>
  <s xml:id="echoid-s3794" xml:space="preserve">Chi adunque cre-<lb/>de, che in tanto chi tiene il galleggiante nel ſito B L O D, <lb/>facia fatica ſecondo l’ecceſſo della grauità di tant’ acqua <lb/>vguale al gallegiante ſopra la grauità del medemo, perche <lb/>nell’immergerſi habbia alzato, e tenga alzata mole d’ac-<lb/>qua ad eſſo vguale, erra di gran lunga, dice il medemo Ga-<lb/>lileo _alla pag_. </s>
  <s xml:id="echoid-s3795" xml:space="preserve">7. </s>
  <s xml:id="echoid-s3796" xml:space="preserve">perche non ſe n’alza che vna mole A E H B, <lb/>vguale alla parte H L O N, immerſa ſotto il primo liuello <lb/>H N.</s>
  <s xml:id="echoid-s3797" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3798" xml:space="preserve">_Mat._ </s>
  <s xml:id="echoid-s3799" xml:space="preserve">Si come è vero che l’acqua alzata ſopra il primo liuello <lb/>E H N, è la ſola A E H B, così è anco vero che il galleggian-<lb/>te non è totalmente demerſo ſotto il medemo liuello, mà
<pb o="37" file="00131" n="131" rhead="QVARTO."/>
Ia ſola parte H L O N. </s>
  <s xml:id="echoid-s3800" xml:space="preserve">Onde ſe s’immaginaremo che il gal-<lb/>leggiante ſia tanto diſceſo, che ſia totalmente ſotto il det-<lb/>to liuello nel ſito H M P N, ſarà anco vero che allora ha-<lb/>uera alzato ſopra il liuello E H N, l’acqua A E N D, ad eſſo <lb/>vguale. </s>
  <s xml:id="echoid-s3801" xml:space="preserve">Nè mai diſcenderà totalmente ſotto d’vn liuello <lb/>per tutta la ſua altezza, che non habbia ſolleuato, e ſcaccia-<lb/>to acqua à ſe vguale; </s>
  <s xml:id="echoid-s3802" xml:space="preserve">e che non combatta con acqua pure <lb/>à ſe vguale; </s>
  <s xml:id="echoid-s3803" xml:space="preserve">e in conſeguenza che chilo tiene acciò non ri-<lb/>ſaliſca, non debba adoperar forza vguale all’ecceſſo della <lb/>grauità dell’acqua ad eſſo vguale ſopra la ſua propria. </s>
  <s xml:id="echoid-s3804" xml:space="preserve">Nel <lb/>ſito BLOD, realmente nõ è ſolleuata ſopra il primo liuello <lb/>EHN, che la ſola acqua AEHB, vguale alla parte demerſa <lb/>HLON; </s>
  <s xml:id="echoid-s3805" xml:space="preserve">nulladimeno chi ben conſiderera le ſcambieuoli <lb/>operationi del gallegiante, &amp; </s>
  <s xml:id="echoid-s3806" xml:space="preserve">acqua, biſognerà che con-<lb/>feſſi, che chilo tiene immerſo biſogna che facia la mede-<lb/>
<anchor type="figure" xlink:label="fig-00131-01a" xlink:href="fig-00131-01"/>
ma fatica. </s>
  <s xml:id="echoid-s3807" xml:space="preserve">Perche non la ſola aequa AEHB, combatte <lb/>con il galleggiante, e procura diſcendere, ma tutta l’acqua <lb/>AFLB, ad eſſo vguale, La quale ſe bene nõ è tutta ſtata fat-<lb/>ta ſalire ſopra il primo liuello, nulladimeno è pur tutta ſta-
<pb o="38" file="00132" n="132" rhead="DIALOGO"/>
fatta ſalire. </s>
  <s xml:id="echoid-s3808" xml:space="preserve">E ſe bene non tutta, ſcacciando il galleggian-<lb/>te, diſcende ſotto il detto primo liuello, nulladimeno però <lb/>tutta diſcende.</s>
  <s xml:id="echoid-s3809" xml:space="preserve"/>
</p>
<div xml:id="echoid-div32" type="float" level="2" n="2">
  <figure xlink:label="fig-00131-01" xlink:href="fig-00131-01a">
    <image file="00131-01" xlink:href="http://echo.mpiwg-berlin.mpg.de/zogilib?fn=/permanent/library/9EXVCG1R/figures/00131-01"/>
  </figure>
</div>
<p>
  <s xml:id="echoid-s3810" xml:space="preserve">Per intender la qual coſa, immaginiamo l’AFOD, vaſo ri-<lb/>dotto in priſma con l’acqua EFON auanti l’immerſione <lb/>del galleggiante, il quale immerſo ſia pure BLOD, e <lb/>l’acqua alzata ſino all’ AB. </s>
  <s xml:id="echoid-s3811" xml:space="preserve">Intendiamo &amp; </s>
  <s xml:id="echoid-s3812" xml:space="preserve">acqua, <lb/>e galleggiante diuiſi con piani paralleli all’ FO, in <lb/>tanti priſmi minimi fiſici, cioè d’altezza minima, che <lb/>ſiano F1O, 1. </s>
  <s xml:id="echoid-s3813" xml:space="preserve">2. </s>
  <s xml:id="echoid-s3814" xml:space="preserve">2. </s>
  <s xml:id="echoid-s3815" xml:space="preserve">3. </s>
  <s xml:id="echoid-s3816" xml:space="preserve">come nella figura; </s>
  <s xml:id="echoid-s3817" xml:space="preserve">immaginiamo pari-<lb/>mente il galleggiante alzato, e traſportata la LO, in 1. </s>
  <s xml:id="echoid-s3818" xml:space="preserve">Al-<lb/>lera l’acqua F1L, diſcendendo occuperà il minimo ſpa-<lb/>
<anchor type="figure" xlink:label="fig-00132-01a" xlink:href="fig-00132-01"/>
tio L1O; </s>
  <s xml:id="echoid-s3819" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s3820" xml:space="preserve">1. </s>
  <s xml:id="echoid-s3821" xml:space="preserve">2. </s>
  <s xml:id="echoid-s3822" xml:space="preserve">ſarà diſceſa in F1L; </s>
  <s xml:id="echoid-s3823" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s3824" xml:space="preserve">A12B, in 12. </s>
  <s xml:id="echoid-s3825" xml:space="preserve">11; </s>
  <s xml:id="echoid-s3826" xml:space="preserve">e <lb/>l’acqua, che vorrà diſcendere, ſarà la ſegnata nella figura <lb/>1. </s>
  <s xml:id="echoid-s3827" xml:space="preserve">12 per non multiplicare tante note, ma però il ſito del-<lb/>la ſuperficie 1 ſara occupato dalla ſuperficie 2. </s>
  <s xml:id="echoid-s3828" xml:space="preserve">e quello del-<lb/>la ſuperficie 12. </s>
  <s xml:id="echoid-s3829" xml:space="preserve">dalla ſupetficie A B, che ſaranno iui diſce-<lb/>fe. </s>
  <s xml:id="echoid-s3830" xml:space="preserve">Immaginiamo il galleggiante alzato nel ſito 2. </s>
  <s xml:id="echoid-s3831" xml:space="preserve">l’acqua <lb/>ſegnata 1. </s>
  <s xml:id="echoid-s3832" xml:space="preserve">2. </s>
  <s xml:id="echoid-s3833" xml:space="preserve">che però ſarà 2. </s>
  <s xml:id="echoid-s3834" xml:space="preserve">3. </s>
  <s xml:id="echoid-s3835" xml:space="preserve">deſcendendo occuperà pure <lb/>il ſito 1. </s>
  <s xml:id="echoid-s3836" xml:space="preserve">2. </s>
  <s xml:id="echoid-s3837" xml:space="preserve">la ſciato dal galleggiante, e nel ſito 1. </s>
  <s xml:id="echoid-s3838" xml:space="preserve">2. </s>
  <s xml:id="echoid-s3839" xml:space="preserve">dell’ac-
<pb o="39" file="00133" n="133" rhead="QVARTO."/>
qua ſarà diſceſa la 2. </s>
  <s xml:id="echoid-s3840" xml:space="preserve">3. </s>
  <s xml:id="echoid-s3841" xml:space="preserve">ſegnata che però ſarà 3. </s>
  <s xml:id="echoid-s3842" xml:space="preserve">4. </s>
  <s xml:id="echoid-s3843" xml:space="preserve">e tutta <lb/>l’acqua, che hauerà da diſcendere ſarà 2. </s>
  <s xml:id="echoid-s3844" xml:space="preserve">11. </s>
  <s xml:id="echoid-s3845" xml:space="preserve">ma nel ſito del-<lb/>la 1. </s>
  <s xml:id="echoid-s3846" xml:space="preserve">ſarà la 3 &amp; </s>
  <s xml:id="echoid-s3847" xml:space="preserve">nel ſito della 11. </s>
  <s xml:id="echoid-s3848" xml:space="preserve">ſarà F AB Così ſe ſeguire-<lb/>mo ad immaginarſi alzato il galleggiante nelli ſiti 3. </s>
  <s xml:id="echoid-s3849" xml:space="preserve">4. </s>
  <s xml:id="echoid-s3850" xml:space="preserve">5. </s>
  <s xml:id="echoid-s3851" xml:space="preserve">6. <lb/></s>
  <s xml:id="echoid-s3852" xml:space="preserve">&amp;</s>
  <s xml:id="echoid-s3853" xml:space="preserve">c. </s>
  <s xml:id="echoid-s3854" xml:space="preserve">l’acqua diſcenderà ſempre nel medemo modo, in guitz <lb/>che traiportata la LO, fopra la HN, ſi fermi la diſcela. </s>
  <s xml:id="echoid-s3855" xml:space="preserve">E <lb/>adunque manifeſto che tutta l’acqua AFLB, diſcende nel <lb/>principio, ma nel progreſſo ſolo l’eſtante ſopra la baſe in-<lb/>feriore del galleggiante.</s>
  <s xml:id="echoid-s3856" xml:space="preserve"/>
</p>
<div xml:id="echoid-div33" type="float" level="2" n="3">
  <figure xlink:label="fig-00132-01" xlink:href="fig-00132-01a">
    <image file="00132-01" xlink:href="http://echo.mpiwg-berlin.mpg.de/zogilib?fn=/permanent/library/9EXVCG1R/figures/00132-01"/>
  </figure>
</div>
<p>
  <s xml:id="echoid-s3857" xml:space="preserve">Quando poi l’immergiamo perche queſto moto è contrario <lb/>à quello dell’alza nento, biſogna anco che ſucceda il con-<lb/>trar o. </s>
  <s xml:id="echoid-s3858" xml:space="preserve">Cioè poſta la baſe L O ſopra l’HN, e principian-<lb/>doſi ad immergere. </s>
  <s xml:id="echoid-s3859" xml:space="preserve">l’acqua H6N, entra ſotto l’E6H, occu-<lb/>pando tutto quel ſpatio minimo in altezza, &amp; </s>
  <s xml:id="echoid-s3860" xml:space="preserve">alzãdo quel <lb/>la in E7H Così ſeguitando ad immergeieil galleggiante, <lb/>l’acqua 6.</s>
  <s xml:id="echoid-s3861" xml:space="preserve">5 en@ra ſotto la 5. </s>
  <s xml:id="echoid-s3862" xml:space="preserve">6. </s>
  <s xml:id="echoid-s3863" xml:space="preserve">alzando tutta la ſoprapoſtoli <lb/>ſino all 8 e così ſucceſſiuamente. </s>
  <s xml:id="echoid-s3864" xml:space="preserve">Onde e manifeſto che <lb/>quanto p ù s immerge, tanta maggior quantita d’acqua ſi <lb/>alza; </s>
  <s xml:id="echoid-s3865" xml:space="preserve">dimodo che nel fine ſi alza, e ſi tien ſolleuata tutt <lb/>l’acqua AFLB Ecco adunque che nell’immerger il galleg-<lb/>giante, benche non@opra il primo liuelio, ſi ſolleua però <lb/>tant’acqua quant’e eſſo, e nell eſtrarlo diſcende acqua ad <lb/>eſſo vguale, benche non ſotto il detto liuello. </s>
  <s xml:id="echoid-s3866" xml:space="preserve">Sempre adũ-<lb/>que; </s>
  <s xml:id="echoid-s3867" xml:space="preserve">immerſo che ſia il galleggiante totalinente, combat-<lb/>te con tant acqua vguale ad eſſo. </s>
  <s xml:id="echoid-s3868" xml:space="preserve">Onde chi lo tiene, deue <lb/>ſentire l’ecceſſo della grauità dell’acqua ad eſſo vguale lo. <lb/></s>
  <s xml:id="echoid-s3869" xml:space="preserve">pra la lua grauità, menrre il conato di queſto pareggia <lb/>tanta grauità dell’acqua quanta è la ſua.</s>
  <s xml:id="echoid-s3870" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3871" xml:space="preserve">_Cont_. </s>
  <s xml:id="echoid-s3872" xml:space="preserve">Gia che V.</s>
  <s xml:id="echoid-s3873" xml:space="preserve">S. </s>
  <s xml:id="echoid-s3874" xml:space="preserve">ha notato, e dichiarato queſta dottrina, pri-<lb/>ma de dir altro; </s>
  <s xml:id="echoid-s3875" xml:space="preserve">voglio auuertire loro Signori d’vn modo, <lb/>che non mi par proprio, di parlare del dottiſſimo P. </s>
  <s xml:id="echoid-s3876" xml:space="preserve">Nico-<lb/>lo Cabei Geſuita. </s>
  <s xml:id="echoid-s3877" xml:space="preserve">Que ſti _nel lib 1 methæor. </s>
  <s xml:id="echoid-s3878" xml:space="preserve">quæſt 5. </s>
  <s xml:id="echoid-s3879" xml:space="preserve">pag. </s>
  <s xml:id="echoid-s3880" xml:space="preserve">27. </s>
  <s xml:id="echoid-s3881" xml:space="preserve">nel_ <lb/>_fine della prima colon_. </s>
  <s xml:id="echoid-s3882" xml:space="preserve">dice. </s>
  <s xml:id="echoid-s3883" xml:space="preserve">_Sieni n corpus aere plenum tentes_ <lb/>_infra aquam demergere, videbis tanta vi ſurſum repellere depri-_ <lb/>_mentem, quanta eſt grauitas aquæ; </s>
  <s xml:id="echoid-s3884" xml:space="preserve">quæ ſit æqualis illi mole, vt v.</s>
  <s xml:id="echoid-s3885" xml:space="preserve">g_. <lb/></s>
  <s xml:id="echoid-s3886" xml:space="preserve">_ſi ſit globus vitreus plenus aere, magnitud ne palmari, &amp; </s>
  <s xml:id="echoid-s3887" xml:space="preserve">tentes_ <lb/>_quis deprimere infra aquam; </s>
  <s xml:id="echoid-s3888" xml:space="preserve">ſurſum pellet globus ille tanta vi,_ <lb/>_quanta eſt vis, quæ deorſum premit ſphæra aquea vnius palmi_.</s>
  <s xml:id="echoid-s3889" xml:space="preserve">
<pb o="40" file="00134" n="134" rhead="DIALOGO"/>
_demoſtratur hoe geometricè à mathematicis; </s>
  <s xml:id="echoid-s3890" xml:space="preserve">ſed omitto_.</s>
  <s xml:id="echoid-s3891" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3892" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s3893" xml:space="preserve">Queſte parole mi paiono aſſai confuſe; </s>
  <s xml:id="echoid-s3894" xml:space="preserve">ne so vedere di-<lb/>ſtintamente il loro ſignificato. </s>
  <s xml:id="echoid-s3895" xml:space="preserve">In tutti li caſi, Archimede, <lb/>che è quello, che ha demoſtrato queſta materia _nel ſuo am-_ <lb/>_mirabile libretto de inſi hum. </s>
  <s xml:id="echoid-s3896" xml:space="preserve">prop_. </s>
  <s xml:id="echoid-s3897" xml:space="preserve">6. </s>
  <s xml:id="echoid-s3898" xml:space="preserve">parla come l’habbiamo <lb/>immitato noi. </s>
  <s xml:id="echoid-s3899" xml:space="preserve">Cioe, _ſolida leuiora humido vipreſſa in humidum_ <lb/>_ſurſum feruntur tanta vi, quanta humidum habens molem æqualem_ <lb/>_cum magnitudine eſt grauius ipſa_. </s>
  <s xml:id="echoid-s3900" xml:space="preserve">Conforme adunque à que-<lb/>ſt a fraſe _repellet deprimentem_ conlecceſſo.</s>
  <s xml:id="echoid-s3901" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3902" xml:space="preserve">_Ofr_. </s>
  <s xml:id="echoid-s3903" xml:space="preserve">Se ſono vere le ſue dottrine dichiarate di ſopra, parmi <lb/>che ne meno il Galileo parli eſquiſitamente _in quella ſuæ_ <lb/>_prima prop. </s>
  <s xml:id="echoid-s3904" xml:space="preserve">de galleg. </s>
  <s xml:id="echoid-s3905" xml:space="preserve">e nella pag 7_. </s>
  <s xml:id="echoid-s3906" xml:space="preserve">perche in realta l’acqua, <lb/>che s’alza, e che s’abbaſſa nell’immerger, o eſtrare il galleg <lb/>giante non è vguale alla parte ſommerſa ſotto, ò eſtratta <lb/>ſopra il primo liuello, ma di eſſa ſempre maggiore.</s>
  <s xml:id="echoid-s3907" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3908" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s3909" xml:space="preserve">La propoſitione del Galileo può eſſer e vera, e falſa Ve-<lb/>ra ſe s’intende di quella, che s’alza ſopra, e che s’abbaſſa <lb/>ſotto il primo liuello; </s>
  <s xml:id="echoid-s3910" xml:space="preserve">falſa ſe s intende di quella, che s’al-<lb/>za, &amp; </s>
  <s xml:id="echoid-s3911" xml:space="preserve">abbaſſa aſſolutamente; </s>
  <s xml:id="echoid-s3912" xml:space="preserve">poiche queſta ſempre, ſem-<lb/>pre è maggiore della detta parte del galleggiante. </s>
  <s xml:id="echoid-s3913" xml:space="preserve">Ma ill <lb/>Galileo, per ottener il ſuo intento, non ha biſogno dell’in-<lb/>vgualità nel primo ſenſo, ma nel ſecondo.</s>
  <s xml:id="echoid-s3914" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3915" xml:space="preserve">_Cont_. </s>
  <s xml:id="echoid-s3916" xml:space="preserve">Io oſſeruo vn’altra cola; </s>
  <s xml:id="echoid-s3917" xml:space="preserve">cioè che la dottrina di V. </s>
  <s xml:id="echoid-s3918" xml:space="preserve">S. </s>
  <s xml:id="echoid-s3919" xml:space="preserve">mi <lb/>par vera quando l’acqua AFLB, è vguale al galleggiante <lb/>BLOD, ma quando è minore, per eſſer più anguſto il vaſo, <lb/>allora non combatte con acqua vguale ad eſſo, ma con <lb/>minore.</s>
  <s xml:id="echoid-s3920" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3921" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s3922" xml:space="preserve">Sempre però con l’acqua AFLB, alta quant’è eſſa. </s>
  <s xml:id="echoid-s3923" xml:space="preserve">V.</s>
  <s xml:id="echoid-s3924" xml:space="preserve">S. <lb/></s>
  <s xml:id="echoid-s3925" xml:space="preserve">ha ragione. </s>
  <s xml:id="echoid-s3926" xml:space="preserve">Deue però ſapere che la pietra lidia di parago <lb/>nare li momẽti delle coſe graui è l’vgualita. </s>
  <s xml:id="echoid-s3927" xml:space="preserve">Il fondamento <lb/>di tutta la Mecanica ſuppoſto da Archimede nel principio <lb/>_del lib. </s>
  <s xml:id="echoid-s3928" xml:space="preserve">1. </s>
  <s xml:id="echoid-s3929" xml:space="preserve">æ quipond. </s>
  <s xml:id="echoid-s3930" xml:space="preserve">è. </s>
  <s xml:id="echoid-s3931" xml:space="preserve">Grauia ęqualia, æquali diſtantia poſita, in-_ <lb/>_ter ſe æqualiter ponderare_. </s>
  <s xml:id="echoid-s3932" xml:space="preserve">Da queſto le ne cauano le ſue _prop_ <lb/>7. </s>
  <s xml:id="echoid-s3933" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s3934" xml:space="preserve">8. </s>
  <s xml:id="echoid-s3935" xml:space="preserve">ci<unsure/>oe che le moli appefe da diſtanze reciproche alle <lb/>loro grauita habbiano momenti vguali. </s>
  <s xml:id="echoid-s3936" xml:space="preserve">Da queſto pari-<lb/>mente ne ſegue quello, che comunemente aſſeriſcono tut-<lb/>ti li mecanici; </s>
  <s xml:id="echoid-s3937" xml:space="preserve">cioè che tutti li inſtrumenti nominati me-<lb/>canici ſi riduchino alla Libra, ò ſtadera di braccia vguali.</s>
  <s xml:id="echoid-s3938" xml:space="preserve">
<pb o="41" file="00135" n="135" rhead="QVARTO."/>
Nelnoſtro caſo adunque quando l’acqua AFLB è vguale <lb/>al ſolido BLOD, queſti combatte con eſſa; </s>
  <s xml:id="echoid-s3939" xml:space="preserve">e quando è <lb/>minore, combatte anco con minore. </s>
  <s xml:id="echoid-s3940" xml:space="preserve">Ma queſta però hà <lb/>ſempre il momento medemo, che ha quella ad eſſo vguale.</s>
  <s xml:id="echoid-s3941" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3942" xml:space="preserve">_Ofr_. </s>
  <s xml:id="echoid-s3943" xml:space="preserve">Io non intendo queſta coſa.</s>
  <s xml:id="echoid-s3944" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3945" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s3946" xml:space="preserve">Quando l’acqua AFLB, è vguale al ſolìdo BLOD ſe lo <lb/>ſcaccia fuori con la medema velocità, che ſale il ſolido, di-<lb/>ſcēde anco l’acqua. </s>
  <s xml:id="echoid-s3947" xml:space="preserve">Ma quando l’acqua è minore, diſcende <lb/>con tanto maggior velocità. </s>
  <s xml:id="echoid-s3948" xml:space="preserve">E perche li momenti con <lb/>quali diſcende l’acqua ſi compongono delle grauità dell’-<lb/>acqua, che diſcende, e delle velocita; </s>
  <s xml:id="echoid-s3949" xml:space="preserve">ſempre credo che <lb/>componghino momenti vguali; </s>
  <s xml:id="echoid-s3950" xml:space="preserve">perche tanto credo cre-<lb/>ſcere; </s>
  <s xml:id="echoid-s3951" xml:space="preserve">ò calare la velocità, quanto cala, e creſce la gran-<lb/>dezza dell’acqua, &amp; </s>
  <s xml:id="echoid-s3952" xml:space="preserve">in conſeguenza la ſua grauità. </s>
  <s xml:id="echoid-s3953" xml:space="preserve">Eſſen-<lb/>do coſa fondamentale nella Mecanica, che volocità di <lb/>moto, e grauità di mole ſi tramutano tra ſe a puntino, e <lb/>che vna ſuppl ſce mirabilmente per l’altra. </s>
  <s xml:id="echoid-s3954" xml:space="preserve">Sempre poi il <lb/>galleggiante BLOD, ſommerſo ſino al ſommo, combat-<lb/>te con l’acqua AFLB, alta quant’è eſſo, e non ſolamente <lb/>con quella, che diſcende ſotto il liuello ABD, mentre lo <lb/>ſcaccia. </s>
  <s xml:id="echoid-s3955" xml:space="preserve">Il che fù anco beniſſimo conoſciuto dal medemo <lb/>Galileo _nella prop. </s>
  <s xml:id="echoid-s3956" xml:space="preserve">5 pag_. </s>
  <s xml:id="echoid-s3957" xml:space="preserve">10. </s>
  <s xml:id="echoid-s3958" xml:space="preserve">doue volendo dimoſtrare che <lb/>il gallegiante totalmente ſommerſo viene ſcacciato dall’-<lb/>acqua, lo paragona con queſta alta quant’è eſſo, della <lb/>quale proua il momento maggiore del momento del gal-<lb/>leggiante, e non con quella, che diſcende al ſuo ſalire ſot-<lb/>to il primo liuello.</s>
  <s xml:id="echoid-s3959" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3960" xml:space="preserve">_Ofr_. </s>
  <s xml:id="echoid-s3961" xml:space="preserve">Io non sò ſe l’acqua nell’immerger il galleggiante ſaliſca <lb/>nel modo, che hà dichiarato V.</s>
  <s xml:id="echoid-s3962" xml:space="preserve">S. </s>
  <s xml:id="echoid-s3963" xml:space="preserve">cioè che l’HN, entri ſot-<lb/>to l’EH, e le parti ſotto l’HN, entrino ſotto l’EH, e ſotto-<lb/>poſtoli.</s>
  <s xml:id="echoid-s3964" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3965" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s3966" xml:space="preserve">Quando il galleggiante è la metà del vaſo, ò minore io <lb/>lo tengo di certo per ragione, e per eſperienza. </s>
  <s xml:id="echoid-s3967" xml:space="preserve">La ragio-<lb/>ne è fondata ſopra quel detto comune, che è la medema <lb/>ſtrada quella, che conduce da Tebe ad Atene, e da Atene <lb/>a Tebe. </s>
  <s xml:id="echoid-s3968" xml:space="preserve">Voglio dire in buon linguaggio, che parmi che <lb/>la ſalita dell’acqua ſi facìa in conformità della diſceſa. </s>
  <s xml:id="echoid-s3969" xml:space="preserve">Mà <lb/>non vi hà diffìcolta che nelli predetti caſi la diſceſa ſi fà nel
<pb o="42" file="00136" n="136" rhead="_DIALOG_"/>
modo dichiarato; </s>
  <s xml:id="echoid-s3970" xml:space="preserve">adunque anco l’aſceſa. </s>
  <s xml:id="echoid-s3971" xml:space="preserve">L’eſperienza poi <lb/>è ſtata, che hauendo ſpinto galleggianti in diuerſi vaſi, &amp; </s>
  <s xml:id="echoid-s3972" xml:space="preserve"><lb/>hauendo oſſeruato la ſuperficie dell’acqua, l’hò ſempre <lb/>veduta la medema, che s andaua alzando con tutti quelli <lb/>corpuſcoli, e lanugini, che le ſopraſtauano, &amp; </s>
  <s xml:id="echoid-s3973" xml:space="preserve">in ſporcaua-<lb/>no. </s>
  <s xml:id="echoid-s3974" xml:space="preserve">Mà quando il vaſo è più che doppio del galleggiante, <lb/>hò notato qualche varietà tanto maggiore, e più ſenſibile <lb/>quanto è maggiore. </s>
  <s xml:id="echoid-s3975" xml:space="preserve">Al qual propoſito, credo che V. </s>
  <s xml:id="echoid-s3976" xml:space="preserve">S. </s>
  <s xml:id="echoid-s3977" xml:space="preserve">ha-<lb/>uerà oſſeruato infinite volte che, ò ſputando nell’ acqua <lb/>ſtagnante, ò laſciandoui cadere qualche ſaſſetto, che nel <lb/>luogo, oue cade ſi fà cẽtro, dal quale principiano vno, ò più <lb/>circoli, che eſtendono le loro circonferenze ſino ad vn <lb/>certo ſegno, che ſuaniſcono. </s>
  <s xml:id="echoid-s3978" xml:space="preserve">Queſti non ſono altro che l’-<lb/>acqua ſolleuata ſopra il primo liuello per l’ingreſſo, ò to-<lb/>tale, ò partiale in eſſa del corpicciolo caduto, la quale ſi <lb/>ſpande per di ſopra per ridurſi alla perfetta liuellatione. <lb/></s>
  <s xml:id="echoid-s3979" xml:space="preserve">Quì certo le parti dell’acqua fatte aſcendere, ſe ſubintrano <lb/>ſotto l’altre, e ſe le pigliano il capo, come ha bbiamo det-<lb/>to, ciò non ſuccede che in poca diſtanza. </s>
  <s xml:id="echoid-s3980" xml:space="preserve">Tanto credo che <lb/>ſucceda nell’immerſione del galleggiantein vaſi larghi più <lb/>del doppiò d’eſſo; </s>
  <s xml:id="echoid-s3981" xml:space="preserve">credo che l’acqua, che ſubintra ſia vgua-<lb/>le alla baſe del ſolido, che ſi ſommerge; </s>
  <s xml:id="echoid-s3982" xml:space="preserve">e che leuandoſi in <lb/>capo la ſuperiore, la vadi alzando ſopra il primo liuello di <lb/>modo che queſta ſi vada diffondendo come più alta ſopra <lb/>l’altra. </s>
  <s xml:id="echoid-s3983" xml:space="preserve">Hò immerſo vn galleggiante in vn maſtello aſſai <lb/>largo, &amp; </s>
  <s xml:id="echoid-s3984" xml:space="preserve">hò oſſeruato che la lanugine, che ſopraſtaua all’-<lb/>acqua, ſecondo che il galleggiante più s’immergeua, più <lb/>s’allontanaua da eſſo, e s’accoſtaua alli lati del maſtello. </s>
  <s xml:id="echoid-s3985" xml:space="preserve"><lb/>Segno che nell’immerſione ſaliua certamente dell’ acqua <lb/>ſopra la ſuprema ſuperficie, e ſi ſpandeua verſo li lati. </s>
  <s xml:id="echoid-s3986" xml:space="preserve">Nel-<lb/>la ſolleuatione poi del medemo galleggiante queſta lanu-<lb/>gine di nuouo s’accoſtaua ad eſſo, per la diſceſa certamen-<lb/>te che faceua l’acqua vicina al galleggiante, che lo circon-<lb/>daua; </s>
  <s xml:id="echoid-s3987" xml:space="preserve">nel luogo laſciato della quale diſcendeua la più lon-<lb/>tana per liuellarſi. </s>
  <s xml:id="echoid-s3988" xml:space="preserve">Il che ſuccedēdo in queſta guiſa quãdo il <lb/>vaſo è più che doppio del galleggiante, in realtà non aſ-<lb/>cende, e diſcende tutta l’acqua AFLB, ma certamente non <lb/>minore del medemo galleggiante. </s>
  <s xml:id="echoid-s3989" xml:space="preserve">Il che a noibaſta abbõ-
<pb o="43" file="00137" n="137" rhead="_QVARTO_."/>
dantemente. </s>
  <s xml:id="echoid-s3990" xml:space="preserve">E dopò vna ſi lunga digreſſione, ritornando <lb/>doue è ſtata principiata, parmi di poter ragioneuolmente <lb/>concedere al Signor Ofredi, che ſi fa tanta fatica nel tener <lb/>immerſo il galleggiante, quant’è l’ecceſſo della grauità <lb/>d’vna mole d’acqua vguale ad eſſo ſopra la ſua propria, per <lb/>cheil galleggiante tenga ſolleuato quella mole d’acqua ad <lb/>eſſo vguale, che leuato eſſo diſcenderebbe, eſſendo il fatto <lb/>certiſſimo, anco quando quella non foſſe la vera cagione</s>
</p>
<p>
  <s xml:id="echoid-s3991" xml:space="preserve">_Ofr_. </s>
  <s xml:id="echoid-s3992" xml:space="preserve">Adunque tenendo il vaſo ABC, V. </s>
  <s xml:id="echoid-s3993" xml:space="preserve">S. </s>
  <s xml:id="echoid-s3994" xml:space="preserve">non ſente ſe non <lb/>l’ecceſſo della grauità di tant’acqua in mole quant’è il ve-<lb/>tro con l’aria DBE, ſopra la grauità di queſti, perche alza-<lb/>to il vaſo ABC, ſolo quell’acqua diſcende, e non altr’acqua <lb/>vguale all’acqua ADEC, che reſta in quel medemo luogo. <lb/></s>
  <s xml:id="echoid-s3995" xml:space="preserve">Adunque male paragona vetro, aria, &amp; </s>
  <s xml:id="echoid-s3996" xml:space="preserve">acqua con tant’ac-<lb/>qua quanta è queſta mole.</s>
  <s xml:id="echoid-s3997" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s3998" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s3999" xml:space="preserve">Dato, e non conceſſo, che non diſcendeſſe l’acqua vgua-<lb/>
<anchor type="figure" xlink:label="fig-00137-01a" xlink:href="fig-00137-01"/>
le all’ ADEC, mentre alzando il vaſo, queſta reſti nel me-<lb/>demo luogo, io dico che ciò ſarebbe per accidente, cioè per <lb/>cagione dell’aria, che condenſata per l’acqua entrata nel <lb/>va ſo, mentre alziamo il vaſo non ſentendo tanta preſſio-
<pb o="44" file="00138" n="138" rhead="_DIALOG_"/>
ne, con il proprio elaterio riſpingendo per ritornareal <lb/>ſuo poſto naturale, ſcaccia fuori l’acqua. </s>
  <s xml:id="echoid-s4000" xml:space="preserve">Mà queſta mede-<lb/>ma eſperienza, ò poco diuerſa, fà anco Signor Ofredi con-<lb/>tro di lei E per redarguirla; </s>
  <s xml:id="echoid-s4001" xml:space="preserve">adunque, dico io, quando al-<lb/>zando il vaſo ABC immerſo nell’acqua diſcende tant’ ac-<lb/>qua quant’è tutta la ſua mole con l’acqua, che contiene ſa-<lb/>rebbe vero che queſt’acqua grauitaſſe, e che ſi doueſse far <lb/>la cõparatione di tutta queſta mole con tant<unsure/>’acqua ad eſsa <lb/>vguale. </s>
  <s xml:id="echoid-s4002" xml:space="preserve">Hora Signor Ofredi riempia tuttoil vat<unsure/>o d’acqua, <lb/>e l’alzi, e vedrà che non ſolo l’acqua, che contiene non di-<lb/>ſcenderà mẽtre che il vaſo è ancora ſommerſo. </s>
  <s xml:id="echoid-s4003" xml:space="preserve">ma che le-<lb/>uato in buona parte fuori dell’acqua, tanto e tanto aſcen-<lb/>derà l’acqua, che cõtiene moltoſopra il liuello dell altra; </s>
  <s xml:id="echoid-s4004" xml:space="preserve">ne <lb/>diſcenderà, ſe il vaſo nõ ſarà totalmẽte eſtratto dall’acqua.</s>
  <s xml:id="echoid-s4005" xml:space="preserve"/>
</p>
<div xml:id="echoid-div34" type="float" level="2" n="4">
  <figure xlink:label="fig-00137-01" xlink:href="fig-00137-01a">
    <image file="00137-01" xlink:href="http://echo.mpiwg-berlin.mpg.de/zogilib?fn=/permanent/library/9EXVCG1R/figures/00137-01"/>
  </figure>
</div>
<p>
  <s xml:id="echoid-s4006" xml:space="preserve">Di più; </s>
  <s xml:id="echoid-s4007" xml:space="preserve">quando il vaſo ABC, con l’acqua ADEC, s’alza, cre-<lb/>de V. </s>
  <s xml:id="echoid-s4008" xml:space="preserve">S. </s>
  <s xml:id="echoid-s4009" xml:space="preserve">che ie foſse poſſibile diſtruggere l’aria DBE, ò vera-<lb/>mente eſtenuarla in modo che ſi riduceſse al ſuo primiero <lb/>ſtato crede dico che vſc ſſe l’acqua ADEC? </s>
  <s xml:id="echoid-s4010" xml:space="preserve">Non certo; <lb/></s>
  <s xml:id="echoid-s4011" xml:space="preserve">anzi n’entrarebbe dell’altra, ſpinta dalla maggior preſſione <lb/>dell’atmosfera. </s>
  <s xml:id="echoid-s4012" xml:space="preserve">Bene adunque in queſto caſo ſi farebbe la <lb/>predetta comparatione, e conſtarebbe che l’acqua ADEC, <lb/>grauitaſse.</s>
  <s xml:id="echoid-s4013" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4014" xml:space="preserve">Hopoidetto di ſopra, dato, enon conceſso, che non diſcen-<lb/>deſse l’acqua vguale all ADEC, perche non è vero che nõ <lb/>diſcenda, ſe non in tutto almeno in parte. </s>
  <s xml:id="echoid-s4015" xml:space="preserve">E per inrender <lb/>queſto, ſupponiamo che immergendoſi il vaſo aſcenda l’-<lb/>acqua AFGC, e che continuandoſi ad immergere di nuo-<lb/>uo per lo ſpatio della ſua altezza aſcenda l’acqua ſino in <lb/>DE; </s>
  <s xml:id="echoid-s4016" xml:space="preserve">ſe l’alzaremo per tutta la ſua altezza l’acqua di nuouo <lb/>ritornera in FG ln queſto caſo per l’alzamento del ſolido <lb/>ſara diſceſal acqua ad eſso vguale; </s>
  <s xml:id="echoid-s4017" xml:space="preserve">e pure à ſuo modo par-<lb/>lando, non ſarà rimaſta nel medemo luogo che l’acqua <lb/>vguale al FDEG.</s>
  <s xml:id="echoid-s4018" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4019" xml:space="preserve">_Ofr_ Sia come eſsex ſi voglia, torna tutto vno, ò in vn modo, ò <lb/>nell’altro che parliamo; </s>
  <s xml:id="echoid-s4020" xml:space="preserve">perche noi nel tener il vaſo non <lb/>ſentiremo che il medemo ſpingere, cioe il corriſpondente <lb/>all ecceſso lella grauita di tant’acqua quant’è il vetro, &amp; </s>
  <s xml:id="echoid-s4021" xml:space="preserve"><lb/>aria condenſata. </s>
  <s xml:id="echoid-s4022" xml:space="preserve">Tuttal’ acqua vguale alle mole ABC,
<pb o="45" file="00139" n="139" rhead="_QVARTO_."/>
peſi 4. </s>
  <s xml:id="echoid-s4023" xml:space="preserve">libbre, &amp; </s>
  <s xml:id="echoid-s4024" xml:space="preserve">il vetro, aria condenſata, &amp; </s>
  <s xml:id="echoid-s4025" xml:space="preserve">acqua ADEC <lb/>ne peſi 3 ſentiremo il ſpingere d’vna libbra. </s>
  <s xml:id="echoid-s4026" xml:space="preserve">Supponiamo <lb/>che l’acqua del mezzo vguale all’ ADEC ſtia otioſa per eſ-<lb/>ſer contrapeſata da eſsa, e che qual ſi ſia di queſte peſi 2. <lb/></s>
  <s xml:id="echoid-s4027" xml:space="preserve">libbre; </s>
  <s xml:id="echoid-s4028" xml:space="preserve">tanto, e tanto la rimanente ſupererà il vetro, &amp; </s>
  <s xml:id="echoid-s4029" xml:space="preserve">aria <lb/>d’vna libbra. </s>
  <s xml:id="echoid-s4030" xml:space="preserve">Onde in tutti li modi il noſtro ſenſo prouerà <lb/>la medema fatica.</s>
  <s xml:id="echoid-s4031" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4032" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s4033" xml:space="preserve">Se bene queſta differenza pare la medema in tutti doi li <lb/>modi, e pare che il tatto la proui la medema, nulladimeno <lb/>non è così, &amp; </s>
  <s xml:id="echoid-s4034" xml:space="preserve">è molto diuerſa; </s>
  <s xml:id="echoid-s4035" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s4036" xml:space="preserve">il tatto, &amp; </s>
  <s xml:id="echoid-s4037" xml:space="preserve">vn altro ſenſo <lb/>la conoſcerà molto bene. </s>
  <s xml:id="echoid-s4038" xml:space="preserve">Queſto ſarà il vedere che ſe il <lb/>vetro ABC, &amp; </s>
  <s xml:id="echoid-s4039" xml:space="preserve">aria CBE, ſiano più graui in ſpecie dell’ ac-<lb/>qua, diſcenderebbero più velo cemente (quando ſoli con-<lb/>tinuaſsero à deſcendere) che vetro aria, &amp; </s>
  <s xml:id="echoid-s4040" xml:space="preserve">acqua ADEC. <lb/></s>
  <s xml:id="echoid-s4041" xml:space="preserve">Per dimoſtrare queſta coſa, la quale ſe tirerà dietro altre <lb/>cognitioni non ſprezzabili, mi dica Sig Ofredi; </s>
  <s xml:id="echoid-s4042" xml:space="preserve">ſe poneſſi-<lb/>mo nell’acqua due corpi vguali, vno d’oro, e i’altro di piõ-<lb/>bo qual crede che deſcendeſſe più velocemente?</s>
  <s xml:id="echoid-s4043" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4044" xml:space="preserve">_Ofr_. </s>
  <s xml:id="echoid-s4045" xml:space="preserve">E notiſſima la dottrina ſpiegata mirabilmente dal noſtro <lb/>gran Galileo _nel Dial. </s>
  <s xml:id="echoid-s4046" xml:space="preserve">1. </s>
  <s xml:id="echoid-s4047" xml:space="preserve">deile due nuoue ſcientie_, cioè che dalla <lb/>velocità aſſoluta, con la quale il mobile ſi mouerebbe <lb/>nel vacuo, il mezzo ne leua tanta, quanta è la ſua grauità. <lb/></s>
  <s xml:id="echoid-s4048" xml:space="preserve">Per eſempio; </s>
  <s xml:id="echoid-s4049" xml:space="preserve">ſe l’oro foſſe 20. </s>
  <s xml:id="echoid-s4050" xml:space="preserve">volte più graue dell acqua, &amp; </s>
  <s xml:id="echoid-s4051" xml:space="preserve"><lb/>il piombo 16. </s>
  <s xml:id="echoid-s4052" xml:space="preserve">eisendo le loro velocità nel vacuo vguali, <lb/>l’acqua leuerebbe alla velocità dell’oro vn vigeſimo, &amp; </s>
  <s xml:id="echoid-s4053" xml:space="preserve">a <lb/>quella del piombo vn ſeſtodecimo: </s>
  <s xml:id="echoid-s4054" xml:space="preserve">on le la velocità dell’-<lb/>oro nell’acqua à quella del piombo ſarebbe come 19 à 18. </s>
  <s xml:id="echoid-s4055" xml:space="preserve"><lb/>e tre quaiti.</s>
  <s xml:id="echoid-s4056" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4057" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s4058" xml:space="preserve">Tanto che l’oro diſcenderebbe con la velocità corriſpõ-<lb/>dente à 19. </s>
  <s xml:id="echoid-s4059" xml:space="preserve">D modo che ſe peſaſse lib 20. </s>
  <s xml:id="echoid-s4060" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s4061" xml:space="preserve">tant’acqua ad <lb/>eſso vguale lib. </s>
  <s xml:id="echoid-s4062" xml:space="preserve">1. </s>
  <s xml:id="echoid-s4063" xml:space="preserve">diſcenderebbe con velocità corriſpon-<lb/>dente a lib. </s>
  <s xml:id="echoid-s4064" xml:space="preserve">19. </s>
  <s xml:id="echoid-s4065" xml:space="preserve">Il che anco quando non ſuccedeſse così per <lb/>che non ſono ſicuro di queſta dottrina del Galileo, mi ba-<lb/>ſta che l’oro diſcenderebbe più velocemente del piombo, e <lb/>nel diſcendere ſolleuarebbe acqua, che peſaria vna libbra. <lb/></s>
  <s xml:id="echoid-s4066" xml:space="preserve">Hora intenda V. </s>
  <s xml:id="echoid-s4067" xml:space="preserve">S. </s>
  <s xml:id="echoid-s4068" xml:space="preserve">che con l’oro ſia vnita tanta materia, <lb/>che peſi libre 20 e ſia dalla medema grauità in ſpeciecon <lb/>l’acqua, come ſarebbe ſettole di cauallo; </s>
  <s xml:id="echoid-s4069" xml:space="preserve">queſt aggre gato, <lb/>che ſarà lib. </s>
  <s xml:id="echoid-s4070" xml:space="preserve">40. </s>
  <s xml:id="echoid-s4071" xml:space="preserve">deſcendendo alzarà vna mole d’acqua, che
<pb o="46" file="00140" n="140" rhead="_DIALOGO_"/>
peſerà lib. </s>
  <s xml:id="echoid-s4072" xml:space="preserve">21. </s>
  <s xml:id="echoid-s4073" xml:space="preserve">Crede V. </s>
  <s xml:id="echoid-s4074" xml:space="preserve">S. </s>
  <s xml:id="echoid-s4075" xml:space="preserve">che deſcenderà con la medema <lb/>velocità dell’oro?</s>
  <s xml:id="echoid-s4076" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4077" xml:space="preserve">_Ofr_. </s>
  <s xml:id="echoid-s4078" xml:space="preserve">Nò Signore. </s>
  <s xml:id="echoid-s4079" xml:space="preserve">Diſcenderà con aſsai minor velocità. </s>
  <s xml:id="echoid-s4080" xml:space="preserve">Per-<lb/>che ſe bene tutti doi li ecceſſi ſono aſsolutamente de lib. <lb/></s>
  <s xml:id="echoid-s4081" xml:space="preserve">19. </s>
  <s xml:id="echoid-s4082" xml:space="preserve">nulladimeno paragonati con il mezzo, che s’alza, ſono <lb/>molto diuerſi; </s>
  <s xml:id="echoid-s4083" xml:space="preserve">mentre il primo ad eſso hauea la propor-<lb/>tione de 19. </s>
  <s xml:id="echoid-s4084" xml:space="preserve">ad 1. </s>
  <s xml:id="echoid-s4085" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s4086" xml:space="preserve">il ſecondo de 19. </s>
  <s xml:id="echoid-s4087" xml:space="preserve">a 21; </s>
  <s xml:id="echoid-s4088" xml:space="preserve">quella tanto mag <lb/>giore. </s>
  <s xml:id="echoid-s4089" xml:space="preserve">e queſta minore.</s>
  <s xml:id="echoid-s4090" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4091" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s4092" xml:space="preserve">E ſe all’oro haueſſimo aggiunte lib. </s>
  <s xml:id="echoid-s4093" xml:space="preserve">20. </s>
  <s xml:id="echoid-s4094" xml:space="preserve">di materia più <lb/>leggiera in ſpecie del mezzo?</s>
  <s xml:id="echoid-s4095" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4096" xml:space="preserve">_Ofr_. </s>
  <s xml:id="echoid-s4097" xml:space="preserve">Diſcenderebbe queſto compoſto tanto più lentamente; <lb/></s>
  <s xml:id="echoid-s4098" xml:space="preserve">e potria eſsere che foſse tanto più leggiero in ſpecie del <lb/>ſolo oro, che queſto aggregato foſse, ò della medema gra-<lb/>uità ſpecifica dell’acqua, ò di minore. </s>
  <s xml:id="echoid-s4099" xml:space="preserve">Nelli quali caſi <lb/>queſt’aggregato, nel primo non diſcenderebbe, enelſe-<lb/>condo galleggierebbe.</s>
  <s xml:id="echoid-s4100" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4101" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s4102" xml:space="preserve">V. </s>
  <s xml:id="echoid-s4103" xml:space="preserve">S. </s>
  <s xml:id="echoid-s4104" xml:space="preserve">ha riſpoſto mirabilmente. </s>
  <s xml:id="echoid-s4105" xml:space="preserve">Hora nel noſtro caſo, già <lb/>che ſupponiamo che il vetro ABC, &amp; </s>
  <s xml:id="echoid-s4106" xml:space="preserve">aria cõſtipata DBE, <lb/>ſiano più graui in ſpecie dell’acqua, determiniamo l’ecceſ-<lb/>ſo della loro grauità;</s>
  <s xml:id="echoid-s4107" xml:space="preserve">e ſupponiamo per eſempio che ſia vn <lb/>quinto, dimodo che peſando vetro, &amp; </s>
  <s xml:id="echoid-s4108" xml:space="preserve">aria condenſata <lb/>lib. </s>
  <s xml:id="echoid-s4109" xml:space="preserve">5. </s>
  <s xml:id="echoid-s4110" xml:space="preserve">l’acqua ad eſſi vguale ne peſi 4. </s>
  <s xml:id="echoid-s4111" xml:space="preserve">E manifeſto che di-<lb/>ſcenderanno conla velocità corriſpõdente ad vna libbra.</s>
  <s xml:id="echoid-s4112" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4113" xml:space="preserve">_Ofr_. </s>
  <s xml:id="echoid-s4114" xml:space="preserve">Certiſſimo.</s>
  <s xml:id="echoid-s4115" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4116" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s4117" xml:space="preserve">Intendiamo che al vetro, &amp; </s>
  <s xml:id="echoid-s4118" xml:space="preserve">aria ſia aggiunta l’acqua <lb/>ADEC, che pur peſi lib. </s>
  <s xml:id="echoid-s4119" xml:space="preserve">5. </s>
  <s xml:id="echoid-s4120" xml:space="preserve">sì che tutto queſto compoſto <lb/>debba diſcendere, &amp; </s>
  <s xml:id="echoid-s4121" xml:space="preserve">alzare vna mole d’acqua vguale à tut-<lb/>tala mole ABC; </s>
  <s xml:id="echoid-s4122" xml:space="preserve">è manifeſto che quello, che diſcenderà <lb/>peſerà lib. </s>
  <s xml:id="echoid-s4123" xml:space="preserve">10. </s>
  <s xml:id="echoid-s4124" xml:space="preserve">el’acqua, che s’alzerà lib. </s>
  <s xml:id="echoid-s4125" xml:space="preserve">9. </s>
  <s xml:id="echoid-s4126" xml:space="preserve">Onde la grauità <lb/>del corpo diſcendente eccederà l’acqua alzata pure d’vna <lb/>libbra, ma che ſarà vn decimo. </s>
  <s xml:id="echoid-s4127" xml:space="preserve">E perche li corpi più gra-<lb/>ui del mezzo diſcendono in eſſo con la velocità corriſpon-<lb/>dente all’ecceſſo della lor grauità ſopra quella del mezzo; <lb/></s>
  <s xml:id="echoid-s4128" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s4129" xml:space="preserve">il compoſto del vetro, &amp; </s>
  <s xml:id="echoid-s4130" xml:space="preserve">aria eccedeua il mezzo d’vn <lb/>quinto; </s>
  <s xml:id="echoid-s4131" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s4132" xml:space="preserve">il compoſto di vetro, aria, &amp; </s>
  <s xml:id="echoid-s4133" xml:space="preserve">acqua @ccede d’vn <lb/>decimo, ſi moueranno, e diſcenderanno conforme à que-<lb/>ſti ecceſſi. </s>
  <s xml:id="echoid-s4134" xml:space="preserve">Ma quel quinto ſe bene aſſolutamente è vna lib-<lb/>bra, come è anco il decimo, nulladimeno comparatiua-
<pb o="47" file="00141" n="141" rhead="_QVARTO._"/>
mente al mezzo è maggiore d’vn decimo. </s>
  <s xml:id="echoid-s4135" xml:space="preserve">Adunque di-<lb/>ſcenderà più velocemente il vetro, &amp; </s>
  <s xml:id="echoid-s4136" xml:space="preserve">aria, che il vetro, aria, <lb/>&amp; </s>
  <s xml:id="echoid-s4137" xml:space="preserve">acqua.</s>
  <s xml:id="echoid-s4138" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4139" xml:space="preserve">_Ofr_. </s>
  <s xml:id="echoid-s4140" xml:space="preserve">Con queſte dottrine mi hà fatto conoſcer manifeſtamẽ-<lb/>te, che ſe bene pare, che eſſendo aſſolutamente il medemo <lb/>ecceſſo della grauità dell’acqua vguale al vetro, &amp; </s>
  <s xml:id="echoid-s4141" xml:space="preserve">aria <lb/>condenſata D B E, ſopra la grauità di queſti, e dell’acqua <lb/>vguale à tutta la mole ABC, ſopra la grauità de primi, e <lb/>dell’acqua ADEC, che anco debba cagionare nel tatto la <lb/>medema ſenſatione, nulladimeno non eſſer così; </s>
  <s xml:id="echoid-s4142" xml:space="preserve">perche <lb/>il primo ecceſſo opererà più velocemente che il ſecondo; <lb/></s>
  <s xml:id="echoid-s4143" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s4144" xml:space="preserve">in conſeguenza queſte diuerſe velocità deuono eſſer <lb/>fenſibili; </s>
  <s xml:id="echoid-s4145" xml:space="preserve">perche ſe bene quell’acceſo è il medemo aſſolu-<lb/>tamente, come già è ſtato detto, non però riſpettiuamẽ-<lb/>te, eſſendo diuerſe le proportioni trà li peſi. </s>
  <s xml:id="echoid-s4146" xml:space="preserve">E parmi di-<lb/>pender tutto il preſente negotio da vna g eometrica pro-<lb/>poſitione, che io non voglio dire.</s>
  <s xml:id="echoid-s4147" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4148" xml:space="preserve">_Cont_. </s>
  <s xml:id="echoid-s4149" xml:space="preserve">Caro Sig. </s>
  <s xml:id="echoid-s4150" xml:space="preserve">Ofredi non ne defraudi, ma ne conſoli con <lb/>queſta ſua Geometria, che sà quanto ne vada à genio.</s>
  <s xml:id="echoid-s4151" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4152" xml:space="preserve">_Ofr_. </s>
  <s xml:id="echoid-s4153" xml:space="preserve">La ſeruo.</s>
  <s xml:id="echoid-s4154" xml:space="preserve"/>
</p>
</div>
<div xml:id="echoid-div36" type="section" level="1" n="21">
<head xml:id="echoid-head33" xml:space="preserve">PROPOSITIONE.</head>
<p style="it">
  <s xml:id="echoid-s4155" xml:space="preserve">Sia BE, l’ecceſſo di B A, ſopra C D, &amp; </s>
  <s xml:id="echoid-s4156" xml:space="preserve">ad eſſe ſiano aggiunte <lb/>AF, DG, vguali. </s>
  <s xml:id="echoid-s4157" xml:space="preserve">Sarà maggiore la Proportione di B A, à C D, di <lb/>quella di B F, à CG.</s>
  <s xml:id="echoid-s4158" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4159" xml:space="preserve">@ciaſi come BA, alla C D, coſi AH, à <lb/>
<anchor type="figure" xlink:label="fig-00141-01a" xlink:href="fig-00141-01"/>
GD. </s>
  <s xml:id="echoid-s4160" xml:space="preserve">Perche come BA, alla C D, coſi <lb/>AH, a GD; </s>
  <s xml:id="echoid-s4161" xml:space="preserve">ſarà anco come BA, alla <lb/>CD, così BH, à C G. </s>
  <s xml:id="echoid-s4162" xml:space="preserve">Ma B H, a C G, <lb/>ha maggior proportione che BF, à <lb/>CG, Adunque anco BA, alla CD, ha-<lb/>uerà maggior proportione che BF, a <lb/>CG. </s>
  <s xml:id="echoid-s4163" xml:space="preserve">Ecco adunque che ſe bene BE, <lb/>aſſolutamente è il medemo ecceſſo <lb/>tanto della BF, ſopra la C G, quanto <lb/>della B A, ſopra la CD, nulladimeno <lb/>non ſono le medeme proportioni. <lb/></s>
  <s xml:id="echoid-s4164" xml:space="preserve">Le quali anco tanto più ſi ſminuiſ-<lb/>cono, quanto più le magnitudini vguali aggiunte ſono
<pb o="48" file="00142" n="142" rhead="_DIALOGO_"/>
maggiori.</s>
  <s xml:id="echoid-s4165" xml:space="preserve"/>
</p>
<div xml:id="echoid-div36" type="float" level="2" n="1">
  <figure xlink:label="fig-00141-01" xlink:href="fig-00141-01a">
    <image file="00141-01" xlink:href="http://echo.mpiwg-berlin.mpg.de/zogilib?fn=/permanent/library/9EXVCG1R/figures/00141-01"/>
  </figure>
</div>
<p>
  <s xml:id="echoid-s4166" xml:space="preserve">_Cont._ </s>
  <s xml:id="echoid-s4167" xml:space="preserve">Queſto non l’intendo.</s>
  <s xml:id="echoid-s4168" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4169" xml:space="preserve">_Ofr._ </s>
  <s xml:id="echoid-s4170" xml:space="preserve">Siano aggiunte alle prime altre due grandezze vguali <lb/>FH, GK. </s>
  <s xml:id="echoid-s4171" xml:space="preserve">Già s’è prouato che B A, alla C D, hà maggior pro-<lb/>portione che BF, a CG; </s>
  <s xml:id="echoid-s4172" xml:space="preserve">ma per la ſteſſa propoſitione BF, a <lb/>CG, ha maggior proportione che BH, a CK. </s>
  <s xml:id="echoid-s4173" xml:space="preserve">Adunque _ex_ <lb/>_æquali_ B A, alla C D, ha molto maggior proportione che <lb/>BH, a C K Ecco adunque che quanto maggiori ſaranno <lb/>le magnitudini vguali aggiunte, ſempre tanto più ſi dimi-<lb/>nuirà la proportione.</s>
  <s xml:id="echoid-s4174" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4175" xml:space="preserve">_Cont._ </s>
  <s xml:id="echoid-s4176" xml:space="preserve">Tutto è veriſſimo.</s>
  <s xml:id="echoid-s4177" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4178" xml:space="preserve">_Ofre._ </s>
  <s xml:id="echoid-s4179" xml:space="preserve">Non meno anco è vero, che ſe alla maggiore B A, foſſe <lb/>aggiunta AF minore di K D; </s>
  <s xml:id="echoid-s4180" xml:space="preserve">aggiunta alla minore <lb/>che tanto maggiore ſarebbe la proportione di B A, alla <lb/>C D, di quella di BF, a CK. </s>
  <s xml:id="echoid-s4181" xml:space="preserve">Perche eſsendoſi prouata la pro <lb/>portione di BA, alla CD magg ore di quella di BH, alla <lb/>C K, &amp; </s>
  <s xml:id="echoid-s4182" xml:space="preserve">eſſendo quella di BH alla CK, maggiore di quella <lb/>di BF, alla CK, ſarà queila di B A, alla CD, molto maggio <lb/>re di quella di BF alla C K.</s>
  <s xml:id="echoid-s4183" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4184" xml:space="preserve">_Cont._ </s>
  <s xml:id="echoid-s4185" xml:space="preserve">Tutto và bene. </s>
  <s xml:id="echoid-s4186" xml:space="preserve">Mà io non vedo come queſte verità a <lb/>ſtratte, &amp; </s>
  <s xml:id="echoid-s4187" xml:space="preserve">vm<unsure/>uerſali, ſi poſſino applicar al concreto parti <lb/>colare del qual tr@ttiamo.</s>
  <s xml:id="echoid-s4188" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4189" xml:space="preserve">_Ofred._ </s>
  <s xml:id="echoid-s4190" xml:space="preserve">Oggi V S è molto difficile da contentare. </s>
  <s xml:id="echoid-s4191" xml:space="preserve">Sia BA, la <lb/>grauità dell’aria condenſata, e del vetro; </s>
  <s xml:id="echoid-s4192" xml:space="preserve">e CD, ſia la gra <lb/>uità dell’acqua, che deue alzare L’alzera con la velocita <lb/>co rriſpondente all’ecceſſo della ſua propo rtione, la qua <lb/>velocità và creſcendo ſecondo che creſce la proportione <lb/>E perche aggiunti li peſi vguali AF DG, &amp; </s>
  <s xml:id="echoid-s4193" xml:space="preserve">AH, DK, ſem <lb/>pre le proportioni del vetro, aria. </s>
  <s xml:id="echoid-s4194" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s4195" xml:space="preserve">acqua mancano; </s>
  <s xml:id="echoid-s4196" xml:space="preserve">e <lb/>tanto più, quanto maggiori ſono le grauita dell’acque <lb/>uguali aggiunte; </s>
  <s xml:id="echoid-s4197" xml:space="preserve">adunque alzerà ſempre con minor velo <lb/>cita Che ſe alla BA, grauita del vetro, &amp; </s>
  <s xml:id="echoid-s4198" xml:space="preserve">aria aggiungeſ <lb/>ſimo il peſo AF, minor del Dk, aggiunto al CD; </s>
  <s xml:id="echoid-s4199" xml:space="preserve">tanto più <lb/>s’impiccolirebbe queſta proportione; </s>
  <s xml:id="echoid-s4200" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s4201" xml:space="preserve">in conſeguenza <lb/>alzerebbe con minor velocità.</s>
  <s xml:id="echoid-s4202" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4203" xml:space="preserve">_Cont._ </s>
  <s xml:id="echoid-s4204" xml:space="preserve">Dio me liberi dal ſuſſeguo del Sig. </s>
  <s xml:id="echoid-s4205" xml:space="preserve">Ofredi quando ha da <lb/>parlare geometricamente.</s>
  <s xml:id="echoid-s4206" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4207" xml:space="preserve">_Ofr._ </s>
  <s xml:id="echoid-s4208" xml:space="preserve">Horsù mi abbaſſerò tanto che deuenirò fanciullo, con-
<pb o="49" file="00143" n="143" rhead="_QVARTO._"/>
fermando con vn’eſperienza fanciulleſca quanto è ſtato <lb/>ſin’hora detto. </s>
  <s xml:id="echoid-s4209" xml:space="preserve">Liquefanno li fanciulli del ſapone con l’ac-<lb/>qua, e prendendo vna cannucia a perta d’ambi le parti, im-<lb/>mergono vno delli ſuoi capi in quella ſaponata, poi ſoffi-<lb/>ando gentilmente dall’altra, formano certe sfere più, e <lb/>meno grandi, che hanno vna ſottiliſſima guſcia d’acqua, <lb/>e ſono ripiene di fiato. </s>
  <s xml:id="echoid-s4210" xml:space="preserve">Staccandole poi con deſtrezza <lb/>dalla canna con l’aggitatle vn poco poco, queſte diſcen-<lb/>dono. </s>
  <s xml:id="echoid-s4211" xml:space="preserve">Ma benche queſte habbino attaccato alla parte <lb/>inferiore vna goccia d’acqua, nulladimeno anco per l’aria <lb/>quieta diſcendono con grandiſſima lentezza in compara-<lb/>tione della velocità con la quale diſcenderebbe la ſola ac-<lb/>qua ſe foſſe vnita. </s>
  <s xml:id="echoid-s4212" xml:space="preserve">Queſto certo non ſuccede per altro, ſe <lb/>non perche quelle sfere conſtituiſcono vn compoſto d’ac-<lb/>qua, &amp; </s>
  <s xml:id="echoid-s4213" xml:space="preserve">aria, ò fiato, il quale riſpettiuamente al mezzo <lb/>vguale alla loro mole, che deuono alzare, e ſcacciare, è <lb/>piu leggiero, che non è il ſolo graue paragonato al mezzo <lb/>vguale al ſuo corpo, che douerebbe alzare ſolo.</s>
  <s xml:id="echoid-s4214" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4215" xml:space="preserve">_Mat._ </s>
  <s xml:id="echoid-s4216" xml:space="preserve">Da tutte a dunque queſte dottrine parmi molto euiden-<lb/>temente ſtabilito che l’acqua, che entra nel bicchiere, ò <lb/>vaſo debba grauitare, &amp; </s>
  <s xml:id="echoid-s4217" xml:space="preserve">aggiungere peſo al vetro, &amp; </s>
  <s xml:id="echoid-s4218" xml:space="preserve">aria; <lb/></s>
  <s xml:id="echoid-s4219" xml:space="preserve">parendomi veriſſimo, che allora il mezzo non aggiunga <lb/>peſo al corpo in eſſo collocato, quando non diſcende con <lb/>eſſo, e non cagioni ſalita di parte del medemo mezzo ad <lb/>eſſo vguale; </s>
  <s xml:id="echoid-s4220" xml:space="preserve">ma quando diſcende con il corpo, e con la ſua <lb/>diſceſa cagiona ſalita del medemo mezzo a ſe vguale, pur <lb/>troppo aggiunge peſo.</s>
  <s xml:id="echoid-s4221" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4222" xml:space="preserve">A queſto propoſito voglio ſuggerire vna maniera aſſai ga-<lb/>lante di peſare l’acqua nell’acqua, &amp; </s>
  <s xml:id="echoid-s4223" xml:space="preserve">anco l’aria nella me-<lb/>dema acqua. </s>
  <s xml:id="echoid-s4224" xml:space="preserve">Prendaſi vn gran vaſo di vetro, ò d’altro (co-<lb/>me vna gran boccia) che habbia vn piccolo bucco, che ſi <lb/>chiuda beniſſimo con vn bocchino di ſtagno ſimile a quel-<lb/>li, che hanno le noſtre boccie quadre, che chiamiamo da <lb/>caneuetta, il quale bocchino ſi fori nella ſua ſommità con <lb/>vn piccolo bucchetto; </s>
  <s xml:id="echoid-s4225" xml:space="preserve">s’attacchi al fondo del vaſo tanto <lb/>peſo, che comodamente lo poſſi far diſcendere nell’acqua; <lb/></s>
  <s xml:id="echoid-s4226" xml:space="preserve">e legando queſto vaſo con fune di ſettolle di cauallo ſi la-<lb/>ſci diſcendere; </s>
  <s xml:id="echoid-s4227" xml:space="preserve">ſecondo che più, e più diſcendera, anderà
<pb o="50" file="00144" n="144" rhead="_DIALOGO_"/>
entrando nel vaſo per quel piccolo buccolino ſempre <lb/>maggior, e maggior quantità d’acqua ſenza che n’eſca vna <lb/>minima particella d’aria, la quale ſempre s’anderà più, e <lb/>più condenſando.</s>
  <s xml:id="echoid-s4228" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4229" xml:space="preserve">_Ofred._ </s>
  <s xml:id="echoid-s4230" xml:space="preserve">E poſſibile queſta coſa?</s>
  <s xml:id="echoid-s4231" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4232" xml:space="preserve">_Cont._ </s>
  <s xml:id="echoid-s4233" xml:space="preserve">Queſt’eſperienza è ſtata fatta dal Sig. </s>
  <s xml:id="echoid-s4234" xml:space="preserve">Sinclaro, e la regi-<lb/>ſtra _nel lib. </s>
  <s xml:id="echoid-s4235" xml:space="preserve">2. </s>
  <s xml:id="echoid-s4236" xml:space="preserve">Dial. </s>
  <s xml:id="echoid-s4237" xml:space="preserve">4. </s>
  <s xml:id="echoid-s4238" xml:space="preserve">principiando dal num._ </s>
  <s xml:id="echoid-s4239" xml:space="preserve">9. </s>
  <s xml:id="echoid-s4240" xml:space="preserve">onde non occorre <lb/>dubitare d’eſſa.</s>
  <s xml:id="echoid-s4241" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4242" xml:space="preserve">_Mat._ </s>
  <s xml:id="echoid-s4243" xml:space="preserve">All eſperienza ſi può aggiungere la ragione. </s>
  <s xml:id="echoid-s4244" xml:space="preserve">L’aria della <lb/>boccia è ſottopoſta alla medema preſſione dell’altra. </s>
  <s xml:id="echoid-s4245" xml:space="preserve">Quã-<lb/>do ſe và immergendo preme ſopra quel buccolino non ſo-<lb/>lo tutta l’altezza dell’atmosfera della medema forza con <lb/>eſſa, ma anco tutta l’acqua, che li ſouraſta; </s>
  <s xml:id="echoid-s4246" xml:space="preserve">onde premen-<lb/>do queſto compoſto con maggior momento, caccia dell’-<lb/>acqua nella boccia per quel piccolo pertugio; </s>
  <s xml:id="echoid-s4247" xml:space="preserve">e non po-<lb/>tendo vſcir l’aria per eſſo otturato per la ſua piccolez-<lb/>za da coſa, che più preme, è neceſſitata a riſtringerſi ſin’à <lb/>tanto, che acquiſti con queſto riſtringimento forza tale, <lb/>che pareggi il momento dell’acqua ſopraſtante, &amp; </s>
  <s xml:id="echoid-s4248" xml:space="preserve">atmos-<lb/>fera.</s>
  <s xml:id="echoid-s4249" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4250" xml:space="preserve">_Ofred._ </s>
  <s xml:id="echoid-s4251" xml:space="preserve">Reſto perſuaſo dalla ragione.</s>
  <s xml:id="echoid-s4252" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4253" xml:space="preserve">_Mat._ </s>
  <s xml:id="echoid-s4254" xml:space="preserve">Hora Sig Ofredi, chi applicherà queſto vaſo ad vna bi-<lb/>lancia, ò ſtadera, trouerà che quanto più diſcenderà, tanto <lb/>più peſerà ſecondo la quantità dell’acqua in eſſo entrata. <lb/></s>
  <s xml:id="echoid-s4255" xml:space="preserve">Chi ſarà quel pazzo, che creda, che queſto maggior peſo <lb/>ſia cauſato non dall acqua entrata, ma dall’aria, che con-<lb/>denſata più di quello, che era prima, ſia fatta più graue in <lb/>ſpecie di quello ch’era?</s>
  <s xml:id="echoid-s4256" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4257" xml:space="preserve">_Ofr._ </s>
  <s xml:id="echoid-s4258" xml:space="preserve">Mo patron mio, inqueſto caſo l’acqua è totalmente ſepa-<lb/>rata dall’acqua del mezzo.</s>
  <s xml:id="echoid-s4259" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4260" xml:space="preserve">_Mat._ </s>
  <s xml:id="echoid-s4261" xml:space="preserve">Intendo. </s>
  <s xml:id="echoid-s4262" xml:space="preserve">In vece di far diſcender il vaſo con il fondo all’-<lb/>ingiù, lo facia diſcender con il bocchino: </s>
  <s xml:id="echoid-s4263" xml:space="preserve">tanto è tanto di-<lb/>fceſo che ſia tanto quanto nell’altra guiſa, entreràin eſſo la <lb/>mede ma quantità d’acqua; </s>
  <s xml:id="echoid-s4264" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s4265" xml:space="preserve">applicato alla ſtadera peſerà <lb/>come prima. </s>
  <s xml:id="echoid-s4266" xml:space="preserve">In queſto caſo l’acqua del vaſo ſarà median-<lb/>te il piccolo pertuggio vnita con l’eſterna. </s>
  <s xml:id="echoid-s4267" xml:space="preserve">Dirà forſe Sig. <lb/></s>
  <s xml:id="echoid-s4268" xml:space="preserve">Ofredi che queſto peſo ſia cauſato dall’aria condenſata? </s>
  <s xml:id="echoid-s4269" xml:space="preserve"><lb/>Lo vadi a dire alle marmote.</s>
  <s xml:id="echoid-s4270" xml:space="preserve"/>
</p>
<pb o="51" file="00145" n="145" rhead="_QVARTO._"/>
<p>
  <s xml:id="echoid-s4271" xml:space="preserve">Per peſare poi l’aria nell’acqua, diſceſo che ſia il vaſo nel pri-<lb/>mo modo aſlai in fondo, sì che molta ſia l’acqua in eſſo <lb/>entrata, ſe vadi ſolleuando a poco a poco, ſecondo che più, <lb/>e più aſcenderà, ſe vedrà aſcendere quantità di bolle, cioè <lb/>l’aria contenuta nel vaſo.</s>
  <s xml:id="echoid-s4272" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4273" xml:space="preserve">_Ofr._ </s>
  <s xml:id="echoid-s4274" xml:space="preserve">Cerramente n’vſcira queſt’aria?</s>
  <s xml:id="echoid-s4275" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4276" xml:space="preserve">_Cont._ </s>
  <s xml:id="echoid-s4277" xml:space="preserve">V’e l’eſperienza del medemo Sig. </s>
  <s xml:id="echoid-s4278" xml:space="preserve">Sinclaro.</s>
  <s xml:id="echoid-s4279" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4280" xml:space="preserve">_Mat._ </s>
  <s xml:id="echoid-s4281" xml:space="preserve">E non manca la ragione Perche alzato in parte il vaſo, <lb/>l’acqua, &amp; </s>
  <s xml:id="echoid-s4282" xml:space="preserve">atmosfera non preme iui come premeua più <lb/>fondo. </s>
  <s xml:id="echoid-s4283" xml:space="preserve">Sì che contropremen@o più l’aria del vaſo, eſce fuo-<lb/>ri in parte ſino che habbia tanto debilitato l’elaterio che <lb/>paregg la p@eſſione dell’acqua, &amp; </s>
  <s xml:id="echoid-s4284" xml:space="preserve">atmosfera. </s>
  <s xml:id="echoid-s4285" xml:space="preserve">E queſta è la <lb/>cauſa che biſogna alzar pian piano; </s>
  <s xml:id="echoid-s4286" xml:space="preserve">perche chi alzaſſe per <lb/>molto ſpatio repentinamente, mentre vi ſaria gran diffe-<lb/>renza tra queſte preſſioni, farebbe l’aria tanta furia per v-<lb/>ſcire, che non potendo per l’anguſtezza del buccolino far-<lb/>lo così preſto, potrebbe ſpezzar il vaſo, come accadè al <lb/>medemo Sig. </s>
  <s xml:id="echoid-s4287" xml:space="preserve">Sinclaro.</s>
  <s xml:id="echoid-s4288" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4289" xml:space="preserve">Hora tirato il vaſo in pello d’acqua, sì che ne ſia vſcita l’aria <lb/>condenſata, e che la rimanente ſia dilatata quanto l’eſte-<lb/>riore, immergendo ſotto acqua tutta quella quantità di <lb/>fune, che era diſceſa, s’applichi pure alla bilancia; </s>
  <s xml:id="echoid-s4290" xml:space="preserve">che ſe <lb/>queſta ſarà eſquiſita, farà conoſcere qualche differenza trà <lb/>il vaſo in queſto ſito, e quando fù peſato nel fondo (ilche <lb/>ſe ſuppone eſſer ſtato fatto) Queſta differen za di peſo non <lb/>ſarà altro che quello che peſa tanta quantità d’aria, quãt’è <lb/>l’acqua, che ſarà entrata nel vaſo.</s>
  <s xml:id="echoid-s4291" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4292" xml:space="preserve">_Ofr._ </s>
  <s xml:id="echoid-s4293" xml:space="preserve">A fare queſt’eſperienza vi vorranno’le gran diligenze.</s>
  <s xml:id="echoid-s4294" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4295" xml:space="preserve">_Mat._ </s>
  <s xml:id="echoid-s4296" xml:space="preserve">Certiſſimo. </s>
  <s xml:id="echoid-s4297" xml:space="preserve">Nulladimeno, _omnia vincit labor improbus_. </s>
  <s xml:id="echoid-s4298" xml:space="preserve">Di-<lb/>chiarate, &amp; </s>
  <s xml:id="echoid-s4299" xml:space="preserve">inteſe bene le dottrine ſoprapoſte, credo che <lb/>facilmente s’intenderà più adequatamente la cagione d’al-<lb/>tro natural Fenomeno di quello che l’abbia inteſa il no-<lb/>ſtro gran Galileo. </s>
  <s xml:id="echoid-s4300" xml:space="preserve">Queſti doppo hauer mirabilmente di-<lb/>chiarato _nel Dial. </s>
  <s xml:id="echoid-s4301" xml:space="preserve">ſopracitato_, che li corpi ſimili della mede-<lb/>ma grauità ſpecifica diſcendono per il medemo mezzo <lb/>con la medema velocità, per eccederlo con il medemo ec-<lb/>ceſſo proportionale, ricerca da che auuenga poi che ſi ve-<lb/>da tanta diuerſità nelle velocità mentre per eſempio, ve-
<pb o="52" file="00146" n="146" rhead="_DIALOGO_"/>
draſi che vn quadrello diſcenderà per tant’ acqua in due, <lb/>battute di polſo, che ſpezzato in particelle piccoliſſime, <lb/>tall’ vna di quelle a diſcendere la medema acqua conſu-<lb/>merà più hore, e giorni. </s>
  <s xml:id="echoid-s4302" xml:space="preserve">Ricorre egli _nella pag_. </s>
  <s xml:id="echoid-s4303" xml:space="preserve">88. </s>
  <s xml:id="echoid-s4304" xml:space="preserve">_alla ſca-_ <lb/>_broſità, ò poroſità, che communemẽte, e per lo più neceſſariamente_ <lb/>_ſi ritroua nella ſuperficie de i corpi ſolidi, le quali ſcabroſità nel_ <lb/>_moto d’eſſi vanno vrtando nell’aria, ò altro mezzo ambiente, &amp;_</s>
  <s xml:id="echoid-s4305" xml:space="preserve"> <lb/>_apportano ritardamento alla velocità, e tanto maggiore, quanto_ <lb/>_la ſuperficie ſarà più grande, quale è quella de i ſolidi minori para-_ <lb/>_gonati à i maggiori_. </s>
  <s xml:id="echoid-s4306" xml:space="preserve">Il che viene da eſſo dimoſtrato. </s>
  <s xml:id="echoid-s4307" xml:space="preserve">Ma io <lb/>oltre a queſta, n’aſſegnarei due altre cauſe prouenienti dal-<lb/>le dottrine ſopra dichiarate. </s>
  <s xml:id="echoid-s4308" xml:space="preserve">Mi dica Sig. </s>
  <s xml:id="echoid-s4309" xml:space="preserve">Ofredi. </s>
  <s xml:id="echoid-s4310" xml:space="preserve">Ha mai <lb/>hauuto curioſità di vedere li piccoli granelli d’arena, &amp; </s>
  <s xml:id="echoid-s4311" xml:space="preserve">al-<lb/>tri corpiccioli poluerizatti con il microſcopio, o lente col-<lb/>ma, che notabilmente ingrandiſca l’ogetto?</s>
  <s xml:id="echoid-s4312" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4313" xml:space="preserve">_Ofr_. </s>
  <s xml:id="echoid-s4314" xml:space="preserve">Si Signore. </s>
  <s xml:id="echoid-s4315" xml:space="preserve">Et hò oſſeruato con gran mia ammiratione, <lb/>che ſe bene li loro corpiccioli paiono all’occhio libero co-<lb/>me tante sferette; </s>
  <s xml:id="echoid-s4316" xml:space="preserve">veduti però con il microſcopio ſono ri-<lb/>pieni di certe cauità, e montuoſità, e ſono corpi irrego, <lb/>lariſſimi.</s>
  <s xml:id="echoid-s4317" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4318" xml:space="preserve">_Cont_. </s>
  <s xml:id="echoid-s4319" xml:space="preserve">Quanto più irregolari, ſaranno anco le loro ſuperficie <lb/>tanto maggiori; </s>
  <s xml:id="echoid-s4320" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s4321" xml:space="preserve">in conſeguenza prenderà maggior vi-<lb/>gore la cauſa aſſegnata dal Galileo.</s>
  <s xml:id="echoid-s4322" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4323" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s4324" xml:space="preserve">Ma di più ſarà anco vero, che ripoſti queſti nel mezzo <lb/>fluido, come nell acqua, ò quelle cauitàſaranno riempi-<lb/>te da eſſa, ò per la loro piccolezza, ò altro accidente reſte-<lb/>ranno pure piene d’aria. </s>
  <s xml:id="echoid-s4325" xml:space="preserve">In ambidue li caſi quello, che di-<lb/>ſcenderà non ſaràil corpicciolo ſolo, ma queſto congion-<lb/>to con dell’acqua, ò con dell’aria; </s>
  <s xml:id="echoid-s4326" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s4327" xml:space="preserve">in conſeguenza doue-<lb/>rà nella ſua diſceſa alzare mole d’acqua non vguale al ſolo <lb/>proprio corpicciolo, ma ad eſſo, &amp; </s>
  <s xml:id="echoid-s4328" xml:space="preserve">acqua, ò aria. </s>
  <s xml:id="echoid-s4329" xml:space="preserve">Nelli <lb/>qua li caſi diſcenderà, ma certo più lentamente che ſe di-<lb/>ſcendeſſe ſolo. </s>
  <s xml:id="echoid-s4330" xml:space="preserve">Può eſſer adunque che quel corpicciolo ſia <lb/>congionto con tant’aria, che il locato entro l’acqua, ò non <lb/>ecceda, ò molto di poco in grauitàaltre tant’acqua. </s>
  <s xml:id="echoid-s4331" xml:space="preserve">Nelli <lb/>quali caſi ò non diſcendera, ò con lentezza grande, e gran-<lb/>diſſima.</s>
  <s xml:id="echoid-s4332" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4333" xml:space="preserve">Con queſt’occaſione non voglio mancare di narrarle vn’al-
<pb o="53" file="00147" n="147" rhead="_QVARTO_."/>
tro Fenomeno a queſto propoſito non ſprezzabíle. </s>
  <s xml:id="echoid-s4334" xml:space="preserve">L’al-<lb/>tro giorno per certa eſperienza il Sig. </s>
  <s xml:id="echoid-s4335" xml:space="preserve">Rinaldini. </s>
  <s xml:id="echoid-s4336" xml:space="preserve">D. </s>
  <s xml:id="echoid-s4337" xml:space="preserve">Gio. <lb/></s>
  <s xml:id="echoid-s4338" xml:space="preserve">Antonio Baglioni, &amp; </s>
  <s xml:id="echoid-s4339" xml:space="preserve">io haueuimo riempito vn tubo di ve-<lb/>tro competentemẽte lungo d’acqua, laſciandoli luogo per <lb/>vn poco d’aria, &amp; </s>
  <s xml:id="echoid-s4340" xml:space="preserve">oglio, che doueuano ſeruire con la loro <lb/>ſalita al noſtro propoſito. </s>
  <s xml:id="echoid-s4341" xml:space="preserve">Otturato il tubo con veſcica d’-<lb/>ambi le parti, lo voltauimo, &amp; </s>
  <s xml:id="echoid-s4342" xml:space="preserve">riuoltauimo perpendicola, <lb/>re all’orizonte, oſſeruando per l’acqua la ſalita dell’aria, &amp; </s>
  <s xml:id="echoid-s4343" xml:space="preserve"><lb/>oglio. </s>
  <s xml:id="echoid-s4344" xml:space="preserve">Queſto non aſcendeua tutto vnito, ma ſi diuideua in <lb/>varii come globetti di diuerſe grandezze; </s>
  <s xml:id="echoid-s4345" xml:space="preserve">alcuni delli qua-<lb/>li alle volte conteneuano nella parte inferiore nella loro <lb/>corpulenza quantità di bolle molto bianche, che certa-<lb/>mente erano acqua imprigionata, credo io, dalla viſco-<lb/>ſità dell oglio.</s>
  <s xml:id="echoid-s4346" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4347" xml:space="preserve">_Ofr_. </s>
  <s xml:id="echoid-s4348" xml:space="preserve">E perche non aria?</s>
  <s xml:id="echoid-s4349" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4350" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s4351" xml:space="preserve">L’effetto dimoſtraua che non foſſero aria; </s>
  <s xml:id="echoid-s4352" xml:space="preserve">perche que-<lb/>ſti globetti a ſcendeuano con vna tardita tanto maggiore <lb/>ſopra quella delli altri, che erano oglio puro, quanto mag-<lb/>gior quantità di queſte bolle conteneuano. </s>
  <s xml:id="echoid-s4353" xml:space="preserve">Il che non ſa-<lb/>rebbe ſucceſſo ſe foſſero ſtati aria, la quale hauerebbe ve-<lb/>locitato il loro moto, e non ritardatolo, come s’oſſeruaua <lb/>in altri, che congiunti con eſſa, ſaliuano più velocemente. <lb/></s>
  <s xml:id="echoid-s4354" xml:space="preserve">Di più; </s>
  <s xml:id="echoid-s4355" xml:space="preserve">l’aria congiunta con eſſi li precedeua, e non ſegui-<lb/>ua. </s>
  <s xml:id="echoid-s4356" xml:space="preserve">In oltre, ſe alcuno di queſti gl obetti arriuato ad alto ri-<lb/>trouaua altro globetto, che prima d’eſſo foſſe ſalito che <lb/>però nella parte inferiore conteneſſe ſimil bolle, ſi vedeua-<lb/>no manifeſtamente queſte diſcendere per la corpulenza, <lb/>dell’oglio, che arriuaua doppo il primo, &amp; </s>
  <s xml:id="echoid-s4357" xml:space="preserve">andarſi ad vni-<lb/>re con altri inferiori, e l oglio puro con l’oglio puro.</s>
  <s xml:id="echoid-s4358" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4359" xml:space="preserve"><gap/>ora queſto fenomeno dimoſtra che anco nell’eſpulſione eſ-<lb/>perimentiamo quant’ habbiamo eſperimentato nelle di-<lb/>ſceſe; </s>
  <s xml:id="echoid-s4360" xml:space="preserve">cioè che più tardamente l’acqua cacci l’oglio con-<lb/>giunto con l’acqua, che l’oglio puro; </s>
  <s xml:id="echoid-s4361" xml:space="preserve">ſe bene è il medemo <lb/>aſſolutamente l’ecceſſo della grauità di tant’acqua quant’è <lb/>l’oglio, con l’ecceſſo della grauità di tant’acqua, quant’è <lb/>l’acqua, &amp; </s>
  <s xml:id="echoid-s4362" xml:space="preserve">oglio, ſopra queſti; </s>
  <s xml:id="echoid-s4363" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s4364" xml:space="preserve">è vero che anch in queſto <lb/>caſo l’acqua aggiunge grauità all’ oglio in eſſa collocato <lb/>mentre con eſſo debba ſalire.</s>
  <s xml:id="echoid-s4365" xml:space="preserve"/>
</p>
<pb o="54" file="00148" n="148" rhead="_DIALOGO_"/>
<p>
  <s xml:id="echoid-s4366" xml:space="preserve">_Cont._ </s>
  <s xml:id="echoid-s4367" xml:space="preserve">Io tengo di certo che queſte cauſe habbino luogo in ſi-<lb/>mil caſi. </s>
  <s xml:id="echoid-s4368" xml:space="preserve">Et hora meglio intendo, e penetro la cauſa di cer-<lb/>to Fenomeno, che rammemora il Berigardo _nel predetto_ <lb/>_luogo alla pag_. </s>
  <s xml:id="echoid-s4369" xml:space="preserve">304. </s>
  <s xml:id="echoid-s4370" xml:space="preserve">con queſte parole _Vas vitreum aquæ plenum_ <lb/>_deprehenderam in aqua ponderatum plus ponderare, quam omniz,_ <lb/>_eius fragmenta, rem accuratè ſæpius ex aminando_. </s>
  <s xml:id="echoid-s4371" xml:space="preserve">E dice che <lb/>credeua che il medemo doueſſe ſuccedere peſandolo in <lb/>aria, ma che conobbe che non era vero; </s>
  <s xml:id="echoid-s4372" xml:space="preserve">e che tanto in ac-<lb/>qua, quanto in aria peſaua vgualmente; </s>
  <s xml:id="echoid-s4373" xml:space="preserve">ma che la cauſa per <lb/>la quale in acqua pareua che peſaſse inegualmẽte era. </s>
  <s xml:id="echoid-s4374" xml:space="preserve">_Quod_ <lb/>_intra aquã illa minuta fragmenta coniunctas habẽt multas aeris ve_ <lb/>_ſciculas, quæ aliquo modo ſubleuantlancẽ vbi ſunt fragmenta, quaſu_ <lb/>_inflatio bullentis aquæ, ijs vero amotis eſt idem pondus_. </s>
  <s xml:id="echoid-s4375" xml:space="preserve">Io in virtù <lb/>delle ſopradette dottrine dico, che ſe bene in queſto Feno <lb/>meno può in qualche modo interuenire anco l’aria, non <lb/>però nel modo che dice il Signor Berigardo; </s>
  <s xml:id="echoid-s4376" xml:space="preserve">cioè che ſol-<lb/>leui la lance come fa l’acqua, che bolle; </s>
  <s xml:id="echoid-s4377" xml:space="preserve">poiche l’aria non <lb/>cagiona queſta maggior leggierezza, ma perche il vaſo <lb/>ſpezzato ſi paragona con maggior mole d’acqua, che in <lb/>tiero.</s>
  <s xml:id="echoid-s4378" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4379" xml:space="preserve">_Ofr_. </s>
  <s xml:id="echoid-s4380" xml:space="preserve">Ciò parmi molto difficile da capire.</s>
  <s xml:id="echoid-s4381" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4382" xml:space="preserve">_Cont_. </s>
  <s xml:id="echoid-s4383" xml:space="preserve">Procurerò dichiararlo in modo che V.</s>
  <s xml:id="echoid-s4384" xml:space="preserve">S. </s>
  <s xml:id="echoid-s4385" xml:space="preserve">l’intenda. </s>
  <s xml:id="echoid-s4386" xml:space="preserve">Spez <lb/>zato il vaſo, le ſue particelle, &amp; </s>
  <s xml:id="echoid-s4387" xml:space="preserve">anco le più grandinell <lb/>ſuperficie con le quali erano vnite, hanno infinite cauità <lb/>e montuoſità. </s>
  <s xml:id="echoid-s4388" xml:space="preserve">Queſte ſono cagione del Fenomeno. </s>
  <s xml:id="echoid-s4389" xml:space="preserve">Pe <lb/>intender il che, ſupponga V. </s>
  <s xml:id="echoid-s4390" xml:space="preserve">S. <lb/></s>
  <s xml:id="echoid-s4391" xml:space="preserve">
<anchor type="figure" xlink:label="fig-00148-01a" xlink:href="fig-00148-01"/>
che A B C D, rapreſenti vn graue <lb/>più dell’acqua intiero. </s>
  <s xml:id="echoid-s4392" xml:space="preserve">Queſto <lb/>poſto nell’acqua peſerà tanto <lb/>meno, quanto peſa vna mole d’ <lb/>acqua ad eſso vguale _per la tanto_ <lb/>_decantata prop. </s>
  <s xml:id="echoid-s4393" xml:space="preserve">7. </s>
  <s xml:id="echoid-s4394" xml:space="preserve">del I. </s>
  <s xml:id="echoid-s4395" xml:space="preserve">d’Archim de_ <lb/>_inſid. </s>
  <s xml:id="echoid-s4396" xml:space="preserve">humid_. </s>
  <s xml:id="echoid-s4397" xml:space="preserve">Lo ſupponghi ſpez <lb/>zato in due parti, di modo che <lb/>BEFGC, contenghi la cauità <lb/>EFG, e AEFGD, la montuoſità <lb/>EFG. </s>
  <s xml:id="echoid-s4398" xml:space="preserve">Se nella cauità EFG, può <lb/>entrare l’acqua a riẽpirla, allora <lb/>tanto peſerà B D, ſpezzato co-
<pb o="55" file="00149" n="149" rhead="_QVARTO_."/>
me intiero. </s>
  <s xml:id="echoid-s4399" xml:space="preserve">Ma ſe la cauita EFG, foſse nell’acqua, ò ripie-<lb/>na d’aria, ò coſi minima, che non foſse capace ne d’acqua, <lb/>ne d’aria, ma rimaneſse vacua, allora peſerebbe meno <lb/>ſpezzato che intiero. </s>
  <s xml:id="echoid-s4400" xml:space="preserve">Perche la parte BEFGC, ſi parago-<lb/>nerebbe con l’acqua vguale a tutta la mole BEGC, che ſa-<lb/>rebbe quella collocata nell’acqua; </s>
  <s xml:id="echoid-s4401" xml:space="preserve">e l a parte AEFGD, con <lb/>lacqua vguale a tutta queſta mole. </s>
  <s xml:id="echoid-s4402" xml:space="preserve">Onde l’acqua parago-<lb/>nata con ambidue queſte parti eccederebbe la paragonata <lb/>con tutta la BD, intiera di tant’acqua quanta foſse la mon-<lb/>tuoſità EFG. </s>
  <s xml:id="echoid-s4403" xml:space="preserve">E perche l’acqua leua dal peſo del graue po-<lb/>ſto in eſsa quanta è la grauità dell’acqua, che con eſso ſi <lb/>paragona; </s>
  <s xml:id="echoid-s4404" xml:space="preserve">più leuerà l’acqua paragonata con le parti, di <lb/>quello che leui la paragonata cõ il tutto. </s>
  <s xml:id="echoid-s4405" xml:space="preserve">Adunque le par-<lb/>ti rimaneranno più leggieri del tutto. </s>
  <s xml:id="echoid-s4406" xml:space="preserve">Quello che habbia-<lb/>mo detto d’vna intendaſi di tutte. </s>
  <s xml:id="echoid-s4407" xml:space="preserve">E perche nel vaſo ſpez-<lb/>zato ſi contengono infinite cauità, e montuoſità, le quali <lb/>benche minime, nulladimeno perche _multa pauca faciunt_ <lb/>_vnum ſatis_, e</s>
</p>
<div xml:id="echoid-div37" type="float" level="2" n="2">
  <figure xlink:label="fig-00148-01" xlink:href="fig-00148-01a">
    <image file="00148-01" xlink:href="http://echo.mpiwg-berlin.mpg.de/zogilib?fn=/permanent/library/9EXVCG1R/figures/00148-01"/>
  </figure>
</div>
<p style="it">
  <s xml:id="echoid-s4408" xml:space="preserve">Adde parum paruo, paruo ſuperadde puſillum,</s>
</p>
<p style="it">
  <s xml:id="echoid-s4409" xml:space="preserve">Tandem de paruis magnus aceruus erit;</s>
  <s xml:id="echoid-s4410" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4411" xml:space="preserve">quindi è che formano vn tal che, il quale anco ſi conoſce <lb/>con la ſtadera, ò bilance, peſando meno il vaſo ſpezzato <lb/>che intiero.</s>
  <s xml:id="echoid-s4412" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4413" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s4414" xml:space="preserve">Queſti diſcorſi mi hanno ſuegliato la mente a procurare <lb/>d’inueſtigare le cagioni d’altri effetti, che eſperimentia-<lb/>mo. </s>
  <s xml:id="echoid-s4415" xml:space="preserve">Mi hanno ſempre dato gran faſtidio certi corpuſcoli <lb/>conſtanti di materia più graue in ſpecie di liquidi, nelli qua <lb/>li ſi fermano da per tutto. </s>
  <s xml:id="echoid-s4416" xml:space="preserve">Come per eſempio, dice il nobi-<lb/>liſsimo Boile Ingleſe _in Hiſt. </s>
  <s xml:id="echoid-s4417" xml:space="preserve">fluid. </s>
  <s xml:id="echoid-s4418" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s4419" xml:space="preserve">firmit. </s>
  <s xml:id="echoid-s4420" xml:space="preserve">ſect. </s>
  <s xml:id="echoid-s4421" xml:space="preserve">5. </s>
  <s xml:id="echoid-s4422" xml:space="preserve">Atqui pa-_ <lb/>_lam est plumbum, argentum viuum, quin &amp; </s>
  <s xml:id="echoid-s4423" xml:space="preserve">aurum ipſum, licet in_ <lb/>_mole ſenſibili reperta, ad fundum aquæ regis, vel ſimilis eiuſmodi_ <lb/>_liquoris citiſſimè demergentur; </s>
  <s xml:id="echoid-s4424" xml:space="preserve">attamen a menſtruo corroſa, inque_ <lb/>_partes valde minutas exeſa, adeo eſſe agitationis, quam ante, ca-_ <lb/>_paciora, vt relicto liquoris fundo libere quaqua uerſum, ad ipſam_ <lb/>_quoque ſummitatem vna cum ſociatis liquoris partibus feruntur_ <lb/>_nec ad fundum relab antur_. </s>
  <s xml:id="echoid-s4425" xml:space="preserve">Mai hò potuto ſodisfarmi nell’in-<lb/>ueſtigar la cagione perche queſti corpuſcoletti ſi fermino <lb/>da per tutto, e non diſcendino al fondo, eſſendo più graui
<pb o="56" file="00150" n="150" rhead="_DIALOGO_"/>
in ſpecie d’eſſa acqua, e liquido.</s>
  <s xml:id="echoid-s4426" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4427" xml:space="preserve">_Ofr_. </s>
  <s xml:id="echoid-s4428" xml:space="preserve">Certo che ſe ſono più graui in ſpecie, douerebbero, ben-<lb/>che anco con grandiſſima lentezza come eſperimentia-<lb/>mo in tanti altri, finalmente diſcendere.</s>
  <s xml:id="echoid-s4429" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4430" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s4431" xml:space="preserve">Si quando non diueniſſero per qualche accidente della, <lb/>medema grauità ſpecifica con il liquido. </s>
  <s xml:id="echoid-s4432" xml:space="preserve">Io prego loro Si-<lb/>gnori a reflettere ſe quà poſſi hauer luogo il dire, che quel-<lb/>li corpuſcoli habbino il loro ambito coſi ſcabroſo, e ripie-<lb/>no di cauità coſi minime, che non ſiano capaci delli mini-<lb/>mi di quelli fluidi. </s>
  <s xml:id="echoid-s4433" xml:space="preserve">Onde ſe bene il puro corpuſcolo dell’-<lb/>oro, per eſempio, è aſsai più graue in ſpecie del liquido, <lb/>nulladimeno cõgiunto, ò con tutte quelle minime cauità <lb/>vacue, ò ripiene di materia ſottiliſſima, facia vn’aggregato <lb/>della medema grauità ſpecifica con quel liquido; </s>
  <s xml:id="echoid-s4434" xml:space="preserve">che per-<lb/>ciò ſi fermi da per tutto.</s>
  <s xml:id="echoid-s4435" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4436" xml:space="preserve">E perche vna notitia corre dietro all’altra, da quanto s’è det <lb/>to, forſe ſi potrebbe penetrare la vera cagione delle preci <lb/>pitationi di queſti corpuſcoli. </s>
  <s xml:id="echoid-s4437" xml:space="preserve">Per eſempio, ſoggiunge i <lb/>medemo Boile. </s>
  <s xml:id="echoid-s4438" xml:space="preserve">_Quinimò videre est pondero ſa, &amp; </s>
  <s xml:id="echoid-s4439" xml:space="preserve">mineralia cor_ <lb/>_pora, ſi in corpuſculu ſatis exilia diuidantur, ad eam leuitatem &amp;_</s>
  <s xml:id="echoid-s4440" xml:space="preserve"> <lb/>_volubilitatem redigi poſſe, ut partes ingredientes stillatiorum eti_ <lb/>_liquorum fiant, uti diſcere poſſumus ex illo, quem Chymiſtarum_ <lb/>_alij Butyrum, alij ſimpliciter oleum, alij oleum glaciale Antimo_ <lb/>_nij appellant; </s>
  <s xml:id="echoid-s4441" xml:space="preserve">qui, licet poſt retific ationem liquor fit admodum lim_ <lb/>_pidus, magna tamen ſui parte ex ipſo Antimonij corpore conſtat_ <lb/>_vt patet (prætermiſſa iam eius grauitate) ex eo quod magna pon_ <lb/>_deroſæ calcis albæ, per artem in vitrum antimoniale reducibilis_ <lb/>_quantitas beneficio aquæ limpidæ ex ipſo facilime præcipita_ <lb/>_poſſit._</s>
  <s xml:id="echoid-s4442" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4443" xml:space="preserve">_Ofr_. </s>
  <s xml:id="echoid-s4444" xml:space="preserve">Io direi che quell’acqua limpida infuſa facia con quel l@ <lb/>quore vn cõpoſto aſsai più leggiero in ſpecie del puro l@ <lb/>quore. </s>
  <s xml:id="echoid-s4445" xml:space="preserve">Che perciò quelli corpuſcoli diuenuti più graui in <lb/>ſpecie del mezzo, diſcendino. </s>
  <s xml:id="echoid-s4446" xml:space="preserve">La cera è poco meno gr<gap/> <lb/>ue in ſpecie dell’acqua comune; </s>
  <s xml:id="echoid-s4447" xml:space="preserve">onde ſe vn poco di lim<gap/> <lb/>tura di ferro la farà diſcendere apena, ſe in quell’ acqua s<gap/> <lb/>infonderà vn poco d’acqua ſalſa, ò vn poco di ſale, ſi vede <lb/>rà ritornar a galla. </s>
  <s xml:id="echoid-s4448" xml:space="preserve">Così ſe fatta graue con la predetta l<gap/> <lb/>matura quanto è l’acqua ſalſa, s’infonderà in queſta della
<pb o="57" file="00151" n="151" rhead="QVARTO."/>
dolce, ſi vedrà la cera diſcendere.</s>
  <s xml:id="echoid-s4449" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4450" xml:space="preserve">_Cont_. </s>
  <s xml:id="echoid-s4451" xml:space="preserve">Tutto queſto lo sò anch’io; </s>
  <s xml:id="echoid-s4452" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s4453" xml:space="preserve">è ſtato ſaputo prima di <lb/>noi dal Galileo, e da altri. </s>
  <s xml:id="echoid-s4454" xml:space="preserve">Queſta ſua riſpoſta però Signor <lb/>Ofredi forſe non può quadrare a cert’ eſperienza del Sig-<lb/>Berigardo.</s>
  <s xml:id="echoid-s4455" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4456" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s4457" xml:space="preserve">Et io proporo a loro Signori da conſiderare, ſe in molti <lb/>caſi la vera cauſa poſsa eſsere (almeno vna delle cauſe) che <lb/>li minimi dell’acqua limpida infuſa eſsendo più ſottili del-<lb/>Ii minimi del primo liquido, poſſino penetrare, e cacciarſi <lb/>in quelli ſpatietti delli corpuſcoli, e coſi renderli più graui <lb/>in ſpecie, e capaci di diſcendere.</s>
  <s xml:id="echoid-s4458" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4459" xml:space="preserve">_Cont_. </s>
  <s xml:id="echoid-s4460" xml:space="preserve">Queſta certo mi pare più confacente al Fenomeno del <lb/>Signor Berigardo, che dice _nel luogo ſopra cit. </s>
  <s xml:id="echoid-s4461" xml:space="preserve">pag_. </s>
  <s xml:id="echoid-s4462" xml:space="preserve">299. </s>
  <s xml:id="echoid-s4463" xml:space="preserve">darſi <lb/>certi metalli, _Quorum ſolutione tingitur aqua, &amp; </s>
  <s xml:id="echoid-s4464" xml:space="preserve">quæ mox ad fun-_ <lb/>_dum iniecto ſale præcipitantur_. </s>
  <s xml:id="echoid-s4465" xml:space="preserve">Non sò ſe il ſale con quell’ac-<lb/>qua facia vn compoſto più leggiero in ſpecie della ſola ac-<lb/>qua, ò più graue. </s>
  <s xml:id="echoid-s4466" xml:space="preserve">Onde per queſto capo quelli corpuſcoli <lb/>meno doueſsero diſcendere.</s>
  <s xml:id="echoid-s4467" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4468" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s4469" xml:space="preserve">Più graue certo, ſe quella è acqua ordinaria. </s>
  <s xml:id="echoid-s4470" xml:space="preserve">Anco di <lb/>queſto Fenomeno forſe la cauſa ſa@à che li minimi del ſa-<lb/>le poſſino più prontamente cacciarſi in quelli ſpatietti de <lb/>minimi metallici, di quello che poſſino fare li minimi di <lb/>quell’acqua, e così rendendoli più graui farli diſcendere. </s>
  <s xml:id="echoid-s4471" xml:space="preserve">Se <lb/>potrebbe anco cõſiderare ſecõ queſte infuſioni di ſale, ac-<lb/>qua, e meſcolanze di diuerſe materie ſi faceſse, &amp; </s>
  <s xml:id="echoid-s4472" xml:space="preserve">eccitaſse <lb/>vna tal fermentatione, mediante la quale le particelle di <lb/>quelli liquidi riceueſsero vn moto più efficace dell’ordina-<lb/>rio conſeruante la loro fluidità, nel quale ſempre ſono, <lb/>mediante il quale poteſſero più prontamente cacciarſi in <lb/>quelli ſpatietti. </s>
  <s xml:id="echoid-s4473" xml:space="preserve">Già è maniſeſto, come habbiamo tocco <lb/>anco di ſopra, che vn corpo in moto maggiore entrerà in <lb/>quelli luoghi, nelli quali non entrerà con moto minore. </s>
  <s xml:id="echoid-s4474" xml:space="preserve">Io <lb/>hò tocche queſte cauſe, acciò loro Signori l’eſaminino; <lb/></s>
  <s xml:id="echoid-s4475" xml:space="preserve">che per altro io non le ſpoſo.</s>
  <s xml:id="echoid-s4476" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4477" xml:space="preserve">_Vont_. </s>
  <s xml:id="echoid-s4478" xml:space="preserve">Io non sò ſe li minimi del ſale ſe poſſino cacciare più <lb/>prontamente in quelli ſpatietti che li minimi dell’acqua; <lb/></s>
  <s xml:id="echoid-s4479" xml:space="preserve">sò bene che queſti prontamente ſi cacciano nel medemo <lb/>ſale, liquefacendolo, e riceuendone vna certa quantità. </s>
  <s xml:id="echoid-s4480" xml:space="preserve">Mi
<pb o="58" file="00152" n="152" rhead="DIALOG"/>
par coſa molto conſiderabile, e non aliena dal noſtro pro-<lb/>poſito, che ſe ſi ponerà del ſal comune pur nell’ acqua co-<lb/>mune, queſta lo liquefarà ſino ad vn certo ſegno, che ſia <lb/>fatta vna perfetta ſalamora; </s>
  <s xml:id="echoid-s4481" xml:space="preserve">la quale conoſcono queſti no-<lb/>ſtri ſalumieri che ſia fatta, quando ponendo in eſſa vn ouo <lb/>freſco, queſto galleggi. </s>
  <s xml:id="echoid-s4482" xml:space="preserve">Riceuuto che hà l’acqua il ſale, <lb/>che richiede, non è più poſſibile che liquefaccia altro ſale <lb/>comune, e che ne riceua più, ma lo laſcia intatto.</s>
  <s xml:id="echoid-s4483" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4484" xml:space="preserve">_Ofr_. </s>
  <s xml:id="echoid-s4485" xml:space="preserve">Queſto Fenomeno lo sò dalli miei primianni, ma ne vor-<lb/>rei ſapere la cagione.</s>
  <s xml:id="echoid-s4486" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4487" xml:space="preserve">_Cont_. </s>
  <s xml:id="echoid-s4488" xml:space="preserve">Credo che queſt’effetto ſia vno delli ſoliti cauſati dalla <lb/>preſſione dell’aria, e liquidi. </s>
  <s xml:id="echoid-s4489" xml:space="preserve">Preme l’atmosfera l’acqua, e <lb/>queſta la ſottopoſtoli;</s>
  <s xml:id="echoid-s4490" xml:space="preserve">ma queſta per liberarſi dalla preſſio-<lb/>ne penetra in tutti quelli ſpati, che puole: </s>
  <s xml:id="echoid-s4491" xml:space="preserve">onde incontran-<lb/>do li grani del ſale, è cacciata, e ſpinta da queſta preſſione <lb/>nelli infiniti ſpatietti, e pori, che ſono diſperſi trà li mini-<lb/>mi, che compongono il ſale. </s>
  <s xml:id="echoid-s4492" xml:space="preserve">In queſta guiſa ſeparanno <lb/>quelli minimi, e li rendono fluidi in guiſa, che con li mini-<lb/>mi dell’acqua compongono vn fluido, li di cui minimi ſo-<lb/>no maggiori, ò più craſſi delli puri minimi dell’acqua. <lb/></s>
  <s xml:id="echoid-s4493" xml:space="preserve">Queſti minimi adunque ſeguono à cacciarſi nelli ſpatiet ti <lb/>e pori del ſale ſino che queſti ne ſono capaci, e li permet-<lb/>tono l’ingreſſo; </s>
  <s xml:id="echoid-s4494" xml:space="preserve">ma quando poi dalli minimi del ſale ſono <lb/>coſi ingroſſati, che non poſſino più cacciarſi, ne quelli li <lb/>poſſino più riceuere;</s>
  <s xml:id="echoid-s4495" xml:space="preserve">allora ceſſa la liquefattione, per mol-<lb/>to che s’infonda ſale.</s>
  <s xml:id="echoid-s4496" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4497" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s4498" xml:space="preserve">Realmente chi voleſſe negare che li minimi della ſala-<lb/>mora non foſſero più craſſi delli minimi dell’acqua comu-<lb/>ne, meritarebbe delle ſaſſatte; </s>
  <s xml:id="echoid-s4499" xml:space="preserve">mentre manifeſtamente ſi <lb/>vede che l’acqua comune è più leggiera, più fluida, e più <lb/>ſottile della ſalamora Nulladimeno io proponerò due eſ-<lb/>perienze da fare per vedere ſe il negotio camina come di-<lb/>ce il Signor Conte.</s>
  <s xml:id="echoid-s4500" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4501" xml:space="preserve">Nella machina del Signor Boile, con la quale ſi procura il <lb/>voto, ſe ponghi vn vaſetto pieno d’a cqua comune con ſa-<lb/>le à ſufficienza per far la ſalamora, e fatto il voto, ſi noti la <lb/>qualità della ſala mora che ſi farà, e tempo. </s>
  <s xml:id="echoid-s4502" xml:space="preserve">Se è vera la dot <lb/>trina del Sig. </s>
  <s xml:id="echoid-s4503" xml:space="preserve">Co: </s>
  <s xml:id="echoid-s4504" xml:space="preserve">ſarà certo qualche differenza trà queſta.</s>
  <s xml:id="echoid-s4505" xml:space="preserve">
<pb o="59" file="00153" n="153" rhead="QVARTO."/>
quella, che ſi farà nell’aria libera. </s>
  <s xml:id="echoid-s4506" xml:space="preserve">Perche ſe queſto è effetto <lb/>della preſſione dell’aria, &amp; </s>
  <s xml:id="echoid-s4507" xml:space="preserve">acqua, doue vi ſarà maggior <lb/>preſſione, come nell’aria libera, li minimi dell’acqua, e più <lb/>preſto, &amp; </s>
  <s xml:id="echoid-s4508" xml:space="preserve">in maggior copia ſaranno cacciati nelli ſpatietti <lb/>del ſale.</s>
  <s xml:id="echoid-s4509" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4510" xml:space="preserve">L’altra eſperienza è queſta. </s>
  <s xml:id="echoid-s4511" xml:space="preserve">Con il medemo vaſo ſi faciano <lb/>tre, quattro, e più vaſi di perfettiſſima ſalamora; </s>
  <s xml:id="echoid-s4512" xml:space="preserve">poi pon-<lb/>gaſſi tutta queſta ſalamora in vn vaſo aſſai più alto, ſi che <lb/>le parti inferiori ſiano molto più premute da queſto peſo, <lb/>che non erano premute le parti inferiori in qual ſi ſia vaſo. <lb/></s>
  <s xml:id="echoid-s4513" xml:space="preserve">lo credo che chi infonderà del nuouo ſale, nè liquefarà par-<lb/>te. </s>
  <s xml:id="echoid-s4514" xml:space="preserve">Perche ſe bene la preſſione di qual ſi ſia vaſo non era <lb/>ſufficiente à cacciare li minimi della ſalamora nelli mini-<lb/>mi del ſale per la loro groſſezza, &amp; </s>
  <s xml:id="echoid-s4515" xml:space="preserve">anguſtezza di queſti, <lb/>vna preſſione maggiore ne potrà pur far pe netrar in <lb/>parte.</s>
  <s xml:id="echoid-s4516" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4517" xml:space="preserve">_Of_. </s>
  <s xml:id="echoid-s4518" xml:space="preserve">V. </s>
  <s xml:id="echoid-s4519" xml:space="preserve">S. </s>
  <s xml:id="echoid-s4520" xml:space="preserve">hà ben narrato il mirabile Fenomeno della ſalomora <lb/>ordinaria, ma poi, per quanto vedo, non sà coſa molto più <lb/>ammirabile. </s>
  <s xml:id="echoid-s4521" xml:space="preserve">Cioè altr’eſperienza fatta a Firenze dal no-<lb/>ſtro Sig. </s>
  <s xml:id="echoid-s4522" xml:space="preserve">Rinaldini, che me l’ha comunicata. </s>
  <s xml:id="echoid-s4523" xml:space="preserve">Se nella ſala-<lb/>mora ordinaria V. </s>
  <s xml:id="echoid-s4524" xml:space="preserve">S. </s>
  <s xml:id="echoid-s4525" xml:space="preserve">infonderà del ſal Gemma, queſta ne <lb/>ſoleuerà parte, e riceuerà ſino ad vn certo ſeguo. </s>
  <s xml:id="echoid-s4526" xml:space="preserve">Et impre-<lb/>gnata che ſia d’eſſo non ne riceuerà più, come s’è detto del <lb/>ſal comune, &amp; </s>
  <s xml:id="echoid-s4527" xml:space="preserve">acqua. </s>
  <s xml:id="echoid-s4528" xml:space="preserve">Se in queſta ſeconda ſalamora infō-<lb/>derà dell’alume di Rocca, ſuccederà il medemo. </s>
  <s xml:id="echoid-s4529" xml:space="preserve">Se di nuo-<lb/>uo infonderà del ſal Armoniaco, e poi ſal Nitro, e per fine <lb/>Zuccaro, ſempre ſuccederà il medemo, che ſaranno li-<lb/>quefatti ſino ad vn certo ſegno. </s>
  <s xml:id="echoid-s4530" xml:space="preserve">In conformità delle ſue <lb/>dottrine biſogneria dire, che li minimi della ſala mora non <lb/>baſtanti ad eſſer cacciati nelli ſpatietti del ſal comune, po-<lb/>teſſero eſſer cacciati nelli ſpatietti del ſal Gemma; </s>
  <s xml:id="echoid-s4531" xml:space="preserve">e così <lb/>diſcorrendo. </s>
  <s xml:id="echoid-s4532" xml:space="preserve">Ma già che ſopra ſiamo ſtati con il Signor Be-<lb/>rigardo, ritorniamoci in gratia, eſaminãdo alcuni ſuoi det-<lb/>ti non alieni dalle materie ſoprapoſte, regiſtrati da eſſo <lb/>_nella medema pag_. </s>
  <s xml:id="echoid-s4533" xml:space="preserve">294. </s>
  <s xml:id="echoid-s4534" xml:space="preserve">auanti quell’eſperienza, che c’ha dato <lb/>materie di diſcorrer tanto. </s>
  <s xml:id="echoid-s4535" xml:space="preserve">Dopò hauer detto che il fumo, <lb/>e il legno aſcendono per l’acqua tanto velocemente, che <lb/>eſcono anco da eſſa, dice. </s>
  <s xml:id="echoid-s4536" xml:space="preserve">_Aſcend it tamen eò remiſſius quò pro-_
<pb o="60" file="00154" n="154" rhead="DIALOGO"/>
_priùs accedit ad ſuperficiem aquæ ſicut ampulla aere plena, &amp; </s>
  <s xml:id="echoid-s4537" xml:space="preserve">be-_ <lb/>_ne obturata tanto deprimitur violentiùs, quantò profundiùs aquæ_ <lb/>_immergitur. </s>
  <s xml:id="echoid-s4538" xml:space="preserve">Proinde celeriùs moueri debet ex profundiori loco._ <lb/></s>
  <s xml:id="echoid-s4539" xml:space="preserve">_vndè plus aquæ partes eam ſurſum impellunt_.</s>
  <s xml:id="echoid-s4540" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4541" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s4542" xml:space="preserve">Manco male che V. </s>
  <s xml:id="echoid-s4543" xml:space="preserve">S. </s>
  <s xml:id="echoid-s4544" xml:space="preserve">non aſcriue anco queſte partite al <lb/>mio debito; </s>
  <s xml:id="echoid-s4545" xml:space="preserve">almeno le due vltime, e pure lo potria fare <lb/>con qualche fondamento, poiche ho determinato il con-<lb/>trario ad eſſe _nel noſtro pr. </s>
  <s xml:id="echoid-s4546" xml:space="preserve">Dial_. </s>
  <s xml:id="echoid-s4547" xml:space="preserve">Hò detto iui _alla pag_. </s>
  <s xml:id="echoid-s4548" xml:space="preserve">13. </s>
  <s xml:id="echoid-s4549" xml:space="preserve">che <lb/>quando s’immerge il galleggiante, ſino alla total immer-<lb/>ſione ſi fà ſempre maggior fatica quanto più s’immerge; <lb/></s>
  <s xml:id="echoid-s4550" xml:space="preserve">ma paſſata queſta total immerſione, ſi fà ſempre la mede-<lb/>ma fatica. </s>
  <s xml:id="echoid-s4551" xml:space="preserve">L’ampolla del Signor Berigardo è vn galleggiã-<lb/>te come li altri; </s>
  <s xml:id="echoid-s4552" xml:space="preserve">ne perciò deue ſoggiacere ad altre leggi-<lb/>Se adunque egli intende dopò la total immerſione, e tiene <lb/>che l’acqua non patiſca alcuno riſtringimento, credo che <lb/>dica manifeſtamente il falſo; </s>
  <s xml:id="echoid-s4553" xml:space="preserve">perche per tutto l’acqua fà <lb/>la medema forza per ſcacciar insù il galleggiante, ò altro <lb/>corpo in eſſa immerſo. </s>
  <s xml:id="echoid-s4554" xml:space="preserve">Almeno certo la ſua ragione ni-<lb/>ente vale, cioè la maggior altezza dell’ acqua quanto più <lb/>fondo ſi và. </s>
  <s xml:id="echoid-s4555" xml:space="preserve">Se poi è vero che l’acqua quanto più fonda <lb/>ſia vn poco più riſtretta, certamente che quanto più fon-<lb/>da dourèbbe ſcacciar più sù il galleggiante, cioè con mag-<lb/>gior forza. </s>
  <s xml:id="echoid-s4556" xml:space="preserve">Perche riſpingendo qual ſi ſia corpo con la <lb/>propria grauità; </s>
  <s xml:id="echoid-s4557" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s4558" xml:space="preserve">eſſendo tanto più graue quanto più <lb/>fonda, come quella che è più condenſata; </s>
  <s xml:id="echoid-s4559" xml:space="preserve">quanto più fon-<lb/>da riſpingerà con maggior forza E douendo noi ſentire l’-<lb/>ecceſſo della ſua grauità ſopra quella del galleggiante; </s>
  <s xml:id="echoid-s4560" xml:space="preserve">ſen-<lb/>tiremo maggior riſpingimenio quanto più fonda.</s>
  <s xml:id="echoid-s4561" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4562" xml:space="preserve">_Cont_. </s>
  <s xml:id="echoid-s4563" xml:space="preserve">Se l’acqua patiſca compreſſione, ò nò, lo potremo co-<lb/>noſcere peſando in eſſa qualche corpo più graue dell’ac-<lb/>qua. </s>
  <s xml:id="echoid-s4564" xml:space="preserve">Per eſempio peſiamo in eſſa vn pezzo d’oro, che ſia <lb/>bene tutto immerſo, ma poco lontano dalla cima dell’ac-<lb/>qua; </s>
  <s xml:id="echoid-s4565" xml:space="preserve">poicaliamolo molto al fondo, e torniamo a ripeſar-<lb/>lo; </s>
  <s xml:id="echoid-s4566" xml:space="preserve">peſera certo meno, ſe l’acqua patiſce compreſſione. <lb/></s>
  <s xml:id="echoid-s4567" xml:space="preserve">Perche leuando il mezzo all’oro tanta grauità quanto è <lb/>quella d’vna ſua mole vguale alla mole del corpo, che ſi <lb/>peſa, conforme le tanto decantate dottrine d’Archimede; </s>
  <s xml:id="echoid-s4568" xml:space="preserve"><lb/>e di moli vguali dell’acqua peſando più la più fonda, chela
<pb o="61" file="00155" n="155" rhead="QVARTO."/>
meno, ſe è iui più conſtipata; </s>
  <s xml:id="echoid-s4569" xml:space="preserve">quella leuerà dalla grauità <lb/>dell’oro più di queſta.</s>
  <s xml:id="echoid-s4570" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4571" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s4572" xml:space="preserve">Se bene queſti diſcorſi aſtratti paiono molto ragioneuo-<lb/>li, nulladimeno non sò come la coſa ſuccedeſſe in pratica. <lb/></s>
  <s xml:id="echoid-s4573" xml:space="preserve">Perche ſe bene anco l’acqua patiſca riſtringimento, nulla-<lb/>dimeno queſto è pochiſſimo. </s>
  <s xml:id="echoid-s4574" xml:space="preserve">Onde per queſto capo due <lb/>moli vguali d eſſa, cioè vna più fonda notabilmente, &amp; </s>
  <s xml:id="echoid-s4575" xml:space="preserve"><lb/>vna più alta differiranno in grauità molto poco. </s>
  <s xml:id="echoid-s4576" xml:space="preserve">Di più, chi <lb/>n’aſſicurcrà che anco ritrouando queſta differẽza di mag-<lb/>gior, e minor peſo, non naſca eſſa da altro? </s>
  <s xml:id="echoid-s4577" xml:space="preserve">Cioè certamẽ-<lb/>te dall’acqua più denſa, e graue; </s>
  <s xml:id="echoid-s4578" xml:space="preserve">ma non già per la maggior <lb/>preſſione, ma bene per eſſer tale di ſua natura. </s>
  <s xml:id="echoid-s4579" xml:space="preserve">Non è cre-<lb/>dibile che l’acqua ſia corpo homogeneo, ma bene etero-<lb/>geneo, &amp; </s>
  <s xml:id="echoid-s4580" xml:space="preserve">impuro; </s>
  <s xml:id="echoid-s4581" xml:space="preserve">e tanto più, quanto più fonda. </s>
  <s xml:id="echoid-s4582" xml:space="preserve">Onde <lb/>certo di due moli vguali d’eſſa, peſerà più la più baſſa, che <lb/>la più alta.</s>
  <s xml:id="echoid-s4583" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4584" xml:space="preserve">_Ofre_. </s>
  <s xml:id="echoid-s4585" xml:space="preserve">A queſto propoſito mi ſouuiene d’hauer letto _nel Dial_. </s>
  <s xml:id="echoid-s4586" xml:space="preserve">I. <lb/></s>
  <s xml:id="echoid-s4587" xml:space="preserve">_cit del Gal. </s>
  <s xml:id="echoid-s4588" xml:space="preserve">pag_. </s>
  <s xml:id="echoid-s4589" xml:space="preserve">70. </s>
  <s xml:id="echoid-s4590" xml:space="preserve">che per ingannare gentilmẽte alcuni ſuoi <lb/>amici, nel fondo d’vn vaſo poſe dell’acqua ſalata, e ſopra <lb/>della dolce; </s>
  <s xml:id="echoid-s4591" xml:space="preserve">e con limatura di ferro hauendo fatto vna bal-<lb/>la di cera tanto graue, che a pena diſcendeſſe, queſta di-<lb/>ſcendeua ſino che incontraua l’acqua ſalſa, &amp; </s>
  <s xml:id="echoid-s4592" xml:space="preserve">iui ſi ferma-<lb/>ua. </s>
  <s xml:id="echoid-s4593" xml:space="preserve">E ſe la ſpingeua più fondo, ritornaua trà le due ac-<lb/>que.</s>
  <s xml:id="echoid-s4594" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4595" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s4596" xml:space="preserve">Inganno veramente gentile, e degno della filoſofica ſa-<lb/>gacità del Galileo. </s>
  <s xml:id="echoid-s4597" xml:space="preserve">Nell’eſperimentare biſogna hauer mol-<lb/>to bene li occhiaperti e conſiderare attentamente tutte <lb/>le circonſtanze. </s>
  <s xml:id="echoid-s4598" xml:space="preserve">Lidarò vn’eſempio. </s>
  <s xml:id="echoid-s4599" xml:space="preserve">Il dottiſſimo P. <lb/></s>
  <s xml:id="echoid-s4600" xml:space="preserve">Riccioli Geſuita _nell’ Almag. </s>
  <s xml:id="echoid-s4601" xml:space="preserve">lib. </s>
  <s xml:id="echoid-s4602" xml:space="preserve">2. </s>
  <s xml:id="echoid-s4603" xml:space="preserve">cap. </s>
  <s xml:id="echoid-s4604" xml:space="preserve">5. </s>
  <s xml:id="echoid-s4605" xml:space="preserve">n. </s>
  <s xml:id="echoid-s4606" xml:space="preserve">10_. </s>
  <s xml:id="echoid-s4607" xml:space="preserve">inueſtiga que <lb/>ſto Problema. </s>
  <s xml:id="echoid-s4608" xml:space="preserve">_Quantũ plumbi appendendũ ſit dato funi; </s>
  <s xml:id="echoid-s4609" xml:space="preserve">vtcertus,_ <lb/>_recta &amp; </s>
  <s xml:id="echoid-s4610" xml:space="preserve">perpendiculariter tractum ab eo iri funem deorsũ_. </s>
  <s xml:id="echoid-s4611" xml:space="preserve">Sup-<lb/>pone la lũghezza della fune eſſer 1000. </s>
  <s xml:id="echoid-s4612" xml:space="preserve">piedi; </s>
  <s xml:id="echoid-s4613" xml:space="preserve">e preſi piedi <lb/>10. </s>
  <s xml:id="echoid-s4614" xml:space="preserve">della medema, &amp; </s>
  <s xml:id="echoid-s4615" xml:space="preserve">hauendola beniſſimo bagnata ſuppo-<lb/>ne che peſi in aria lib. </s>
  <s xml:id="echoid-s4616" xml:space="preserve">3. </s>
  <s xml:id="echoid-s4617" xml:space="preserve">e fatto altro peſo nell’acqua, troua <lb/>che tant’acqua quanto è eſſa peſi lib. </s>
  <s xml:id="echoid-s4618" xml:space="preserve">4. </s>
  <s xml:id="echoid-s4619" xml:space="preserve">Da queſto ne caua <lb/>che vn cilindro d acqua lungo, &amp; </s>
  <s xml:id="echoid-s4620" xml:space="preserve">vguale alla fune peſerà <lb/>lib 400 Queſto ſaria vero quando tutta l’acqua foſſe della <lb/>medema natura, &amp; </s>
  <s xml:id="echoid-s4621" xml:space="preserve">homogenea; </s>
  <s xml:id="echoid-s4622" xml:space="preserve">ma può eſſer diuerſa per
<pb o="62" file="00156" n="156" rhead="_DIALOGO_"/>
due capi; </s>
  <s xml:id="echoid-s4623" xml:space="preserve">primieramente perche quanto più fonda può eſ-<lb/>ſer tanto più impura; </s>
  <s xml:id="echoid-s4624" xml:space="preserve">ſecondariamente può eſſer tanto <lb/>più conſtipata. </s>
  <s xml:id="echoid-s4625" xml:space="preserve">Tutti queſti capi poſſono molto vitiar l’o-<lb/>peratione. </s>
  <s xml:id="echoid-s4626" xml:space="preserve">e cauſare che quel bolide, ò ſcandaglio, che ſi <lb/>crederà affondarſi rettamente, anderà trauerſo; </s>
  <s xml:id="echoid-s4627" xml:space="preserve">perche <lb/>quell’acqua vguale al piombo, e corda con la ſua grauità <lb/>leuerà molto più di quello che eſſo ſuppone.</s>
  <s xml:id="echoid-s4628" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4629" xml:space="preserve">_Ofr_. </s>
  <s xml:id="echoid-s4630" xml:space="preserve">Anch’io m’arricordo d’hauer vna volta viſto queſto ſuo <lb/>modo di ſcioglier detto problema, &amp; </s>
  <s xml:id="echoid-s4631" xml:space="preserve">hauer notato non sò <lb/>che degno di eſſer auuertito da chi vorrà intendere queſta <lb/>ſua operatione. </s>
  <s xml:id="echoid-s4632" xml:space="preserve">Il peſo del piombo, che ritroua da aggiun-<lb/>ger alla fune è lib. </s>
  <s xml:id="echoid-s4633" xml:space="preserve">100. </s>
  <s xml:id="echoid-s4634" xml:space="preserve">qual peſo biſogna intenderlo in ac-<lb/>qua, e non in aria. </s>
  <s xml:id="echoid-s4635" xml:space="preserve">E perche ſuppone che lib. </s>
  <s xml:id="echoid-s4636" xml:space="preserve">2. </s>
  <s xml:id="echoid-s4637" xml:space="preserve">e mezza di <lb/>piombo in aria peſino in acqua lib. </s>
  <s xml:id="echoid-s4638" xml:space="preserve">2. </s>
  <s xml:id="echoid-s4639" xml:space="preserve">acciò che il piombo <lb/>peſi in acqua lib. </s>
  <s xml:id="echoid-s4640" xml:space="preserve">100. </s>
  <s xml:id="echoid-s4641" xml:space="preserve">biſogna che in aria ne peſi 125. </s>
  <s xml:id="echoid-s4642" xml:space="preserve">Che <lb/>poi biſogni intender che il piompo d’aggiunger alla fune <lb/>peſi lib. </s>
  <s xml:id="echoid-s4643" xml:space="preserve">100. </s>
  <s xml:id="echoid-s4644" xml:space="preserve">in acqua, e non in aria è manifeſto, perche tãt’ <lb/>acqua quanto è la fune peſa lib. </s>
  <s xml:id="echoid-s4645" xml:space="preserve">400. </s>
  <s xml:id="echoid-s4646" xml:space="preserve">e la fune 300. </s>
  <s xml:id="echoid-s4647" xml:space="preserve">il piõbo <lb/>lib. </s>
  <s xml:id="echoid-s4648" xml:space="preserve">100 e l’acqua vguale ad eſſo lib. </s>
  <s xml:id="echoid-s4649" xml:space="preserve">20 Onde l’acqua vguale <lb/>a 100. </s>
  <s xml:id="echoid-s4650" xml:space="preserve">lib. </s>
  <s xml:id="echoid-s4651" xml:space="preserve">di piõbo in aria, e 1000. </s>
  <s xml:id="echoid-s4652" xml:space="preserve">piedi di fune peſerà lib. </s>
  <s xml:id="echoid-s4653" xml:space="preserve">420 <lb/>è il predetto aggregato lib. </s>
  <s xml:id="echoid-s4654" xml:space="preserve">400. </s>
  <s xml:id="echoid-s4655" xml:space="preserve">Onde peſando più l’acqua <lb/>del corpo in eſſa collocato queſto galleggierà. </s>
  <s xml:id="echoid-s4656" xml:space="preserve">Biſogna <lb/>adunque che il piombo peſi in aria lib. </s>
  <s xml:id="echoid-s4657" xml:space="preserve">125. </s>
  <s xml:id="echoid-s4658" xml:space="preserve">perche così con <lb/>la fune peſerà lib. </s>
  <s xml:id="echoid-s4659" xml:space="preserve">425. </s>
  <s xml:id="echoid-s4660" xml:space="preserve">e l’acqua vguale a queſt’ aggregato <lb/>peſerà il m@demo.</s>
  <s xml:id="echoid-s4661" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4662" xml:space="preserve">_Cont_. </s>
  <s xml:id="echoid-s4663" xml:space="preserve">Vn’accidente, che occorre à queſto bolide, ſcandaglio, <lb/>ò altro corpo graue, che appeſo ad vna fune ſi laſcia diſcẽ-<lb/>dere nell’acqua, parmi che dia molto bene a vedere che l’-<lb/>acqua quanto più è profonda, tanto più iui grauiti; </s>
  <s xml:id="echoid-s4664" xml:space="preserve">accada <lb/>poi queſto per qual ſi ſia cauſa Se ſi laſcia diſcendere que-<lb/>ſto graue quanto ſi voglia, finalmente s’arriua in luogo, <lb/>che non più diſcende, ma la fune, &amp; </s>
  <s xml:id="echoid-s4665" xml:space="preserve">il peſo ſtanno bene im-<lb/>merſi, ma però obliquamente; </s>
  <s xml:id="echoid-s4666" xml:space="preserve">e ſe ſi laſcia diſcender più <lb/>fune, più tutto queſto peſo s’obliqua. </s>
  <s xml:id="echoid-s4667" xml:space="preserve">Non ſi può dire <lb/>che queſto aggregato di fune, e di peſo attaccato ſia più <lb/>leggiero in ſpecie dell’acqua da per tutto, perche queſto æ-<lb/>ſcenderebbe à galla. </s>
  <s xml:id="echoid-s4668" xml:space="preserve">Fermandoſi adunque in vn luogo, bi-<lb/>gna dire che iui ſi pareggino li momenti dell’acqua, e del
<pb o="63" file="00157" n="157" rhead="_QVARTO_."/>
detto aggregato; </s>
  <s xml:id="echoid-s4669" xml:space="preserve">e non può ſtare in ſito perpendicolare. <lb/></s>
  <s xml:id="echoid-s4670" xml:space="preserve">perche quell’acqua più profonda peſerebbe più. </s>
  <s xml:id="echoid-s4671" xml:space="preserve">Per que-<lb/>ſto capo adunque della maggior grauità, che può hauere <lb/>l’acqua più fonda della meno può eſſere, che nel deprimer <lb/>l’ampolla del Signor Berigardo ſe facia tanto maggior fa-<lb/>tica quanto più ſi profonda. </s>
  <s xml:id="echoid-s4672" xml:space="preserve">Il Sig. </s>
  <s xml:id="echoid-s4673" xml:space="preserve">Profeſſore dice ciò non <lb/>ſeguire per la maggior altezza dall’ acqua, ſentiremo co-<lb/>me ciò ſia vero; </s>
  <s xml:id="echoid-s4674" xml:space="preserve">tanto più che il medemo giuditio biſogne-<lb/>rà fare d’altra aſperienza dal Dottiſſimo Pietro Gaſſendo, <lb/>il quale pure conformandoſi al Sig. </s>
  <s xml:id="echoid-s4675" xml:space="preserve">Berigardo dice _nel lib. </s>
  <s xml:id="echoid-s4676" xml:space="preserve">2_. </s>
  <s xml:id="echoid-s4677" xml:space="preserve"><lb/>_Philoſ ſect. </s>
  <s xml:id="echoid-s4678" xml:space="preserve">1 cap. </s>
  <s xml:id="echoid-s4679" xml:space="preserve">3_. </s>
  <s xml:id="echoid-s4680" xml:space="preserve">che nel tener vna veſcica gonfia ſotto <lb/>acqua ſi fa tanto maggior fatica quanto più ſi profonda.</s>
  <s xml:id="echoid-s4681" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4682" xml:space="preserve">_Mat_ Queſto Fenomeno, che lei Sig. </s>
  <s xml:id="echoid-s4683" xml:space="preserve">Ofredi ſtima ſimile all’-<lb/>ampolla piena d’aria del Signor Berigardo, è molto diſſi-<lb/>mile E ſe il Gaſſendo intende della fatica, che ſi fà nel pro-<lb/>fondar la veſcica doppo la total immerſione, credo che <lb/>non habbia vna ragione al mondo; </s>
  <s xml:id="echoid-s4684" xml:space="preserve">perche non oſtante an-<lb/>co la maggior grauità dell’acqua fonda, che della meno, <lb/>el può eſſere che per altro accidente, che più ſenſibilmen. <lb/></s>
  <s xml:id="echoid-s4685" xml:space="preserve">te accada alla veſcica di quello poſſi accadere all’ampolla, <lb/>quanto più ſi profonda tanto minor fatica ſi facia. </s>
  <s xml:id="echoid-s4686" xml:space="preserve">Ma <lb/>auanti che ciò eſplichi, giudico bene apportar certa eſpe-<lb/>rienza regiſtrata dal Sig. </s>
  <s xml:id="echoid-s4687" xml:space="preserve">Sinclaro _lib. </s>
  <s xml:id="echoid-s4688" xml:space="preserve">2. </s>
  <s xml:id="echoid-s4689" xml:space="preserve">Dial. </s>
  <s xml:id="echoid-s4690" xml:space="preserve">4. </s>
  <s xml:id="echoid-s4691" xml:space="preserve">n. </s>
  <s xml:id="echoid-s4692" xml:space="preserve">7_ Se vna <lb/>botte piena d’aria beniſſimo chiuſa con peſi attaccati ſi <lb/>renderà coſi graue che diſcenda nell’ acqua, quando in <lb/>eſſa ſia diſceſa 7. </s>
  <s xml:id="echoid-s4693" xml:space="preserve">ouero 8. </s>
  <s xml:id="echoid-s4694" xml:space="preserve">paſſi principierà ad andar in fa-<lb/>ſcio, e romperſi. </s>
  <s xml:id="echoid-s4695" xml:space="preserve">Coſi ſe ſi profonderà nell’acqua vna boc-<lb/>cia fatta di ſtagno, vn vaſo di pietra, di ferro, e di qual ſi <lb/>ſia materia più dura, come è ſtato detto della botte, final-<lb/>mente profondandoſi ſempre più, ſi rompera, tanto più <lb/>preſto, e meno profondo quanto ſarà di materia meno <lb/>dura, e forte. </s>
  <s xml:id="echoid-s4696" xml:space="preserve">La ragione è, che l’acqua circondante il <lb/>vaſo premendolo più quanto più ſi profonda, per conco@ <lb/>rere à queſta preſſione tutta l’altezza dell’acqua premuta <lb/>pure dall’atmosfera, &amp; </s>
  <s xml:id="echoid-s4697" xml:space="preserve">al contrario contrapremendo li <lb/>lati interni del vaſo la ſola aria rachiuſa, che pareggia la ſo <lb/>la preſſione dell’at mosfera, biſogna che queſta cedi alla <lb/>maggior preſſione fatta alle parti eſterne del vaſo, e ſi con-
<pb o="64" file="00158" n="158" rhead="_DIALOG_"/>
ſtipi; </s>
  <s xml:id="echoid-s4698" xml:space="preserve">e che in conſeguenza il vaſo ſi renda, ſe puole; </s>
  <s xml:id="echoid-s4699" xml:space="preserve">e quan-<lb/>do non può più che ſi ſpezzi.</s>
  <s xml:id="echoid-s4700" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4701" xml:space="preserve">_Ofr_. </s>
  <s xml:id="echoid-s4702" xml:space="preserve">Queſt’eſ perienza non è bruta. </s>
  <s xml:id="echoid-s4703" xml:space="preserve">Tanto che l’ampolla del <lb/>Sig. </s>
  <s xml:id="echoid-s4704" xml:space="preserve">Berigardo potrà tanto dimergerſi, che finalmente ſe <lb/>ſpezzi.</s>
  <s xml:id="echoid-s4705" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4706" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s4707" xml:space="preserve">Chi ne hà dubio E ciò tanto più preſto, quanto ſarà me-<lb/>no sferica, e rotonda; </s>
  <s xml:id="echoid-s4708" xml:space="preserve">perche queſta figura arrecca mag-<lb/>gior reſiſtenza alli vaſi. </s>
  <s xml:id="echoid-s4709" xml:space="preserve">Hora Sig. </s>
  <s xml:id="echoid-s4710" xml:space="preserve">Oſredi V. </s>
  <s xml:id="echoid-s4711" xml:space="preserve">S. </s>
  <s xml:id="echoid-s4712" xml:space="preserve">hauerà oſ-<lb/>ſeruato, che premendo vna veſcica gonfia con le mani, ò <lb/>in altro modo, l’aria rachiuſa ſe conſtipa maggiormente, e <lb/>tanto più, quanto più ſi comprime, e con maggior forza; </s>
  <s xml:id="echoid-s4713" xml:space="preserve">e <lb/>che ceſſata la compreſſione, ſi torna con il proprio elate-<lb/>rio ad eſtendere come prima. </s>
  <s xml:id="echoid-s4714" xml:space="preserve">Spingẽdo adunque la veſcica <lb/>ſotto acqua incõtra queſta in acqua, che ſempre maggior-<lb/>mente ſtrige li ſuoi lati eſtrinſeci: </s>
  <s xml:id="echoid-s4715" xml:space="preserve">onde l’aria interna è ne-<lb/>ceſſitata a riſtringerſi; </s>
  <s xml:id="echoid-s4716" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s4717" xml:space="preserve">in conſeguenza la veſcica diuē-<lb/>ta ſempre di mole minore, benche conſerui ſempre il me-<lb/>demo peſo. </s>
  <s xml:id="echoid-s4718" xml:space="preserve">E perche ſempre la veſcica è ſpinta insù dalla <lb/>mole d’acqua ad eſſa vguale, e noi nel tenerla ſentimo l’-<lb/>ecceſſo della grauità di queſt’acqua ſopra la grauità della <lb/>veſcica; </s>
  <s xml:id="echoid-s4719" xml:space="preserve">e la mole d’acqua, che riſpinge la veſcica ſi fa <lb/>ſempre minore; </s>
  <s xml:id="echoid-s4720" xml:space="preserve">quindi è che la ſupera ſempre di minor ec-<lb/>ceſſo. </s>
  <s xml:id="echoid-s4721" xml:space="preserve">Onde per queſto capo dobbiamo ſempre fare minor <lb/>fatica quanto più ſi profonda. </s>
  <s xml:id="echoid-s4722" xml:space="preserve">E può eſſere, che quello, <lb/>che ſcema per queſto capo ſia tanto notabile, che ecceda <lb/>queilo, che poteſſe creſcer per altro; </s>
  <s xml:id="echoid-s4723" xml:space="preserve">cioè per il peſar <lb/>l’acqua più profonda per qual ſi ſia cauſa, che la <lb/>più alta.</s>
  <s xml:id="echoid-s4724" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4725" xml:space="preserve">Se bene da quanto s’è detto ſi poſſi formar qualche giuditio <lb/>di quelle parole del Berigardo. </s>
  <s xml:id="echoid-s4726" xml:space="preserve">_Proinde celerius moueri debet_ <lb/>_ex profundiori loco, vndè plures aquæ partes eam ſurſum impel-_ <lb/>_lunt_; </s>
  <s xml:id="echoid-s4727" xml:space="preserve">e che leuato il patir l’acqua compreſſione, &amp; </s>
  <s xml:id="echoid-s4728" xml:space="preserve">eſſendo <lb/>per tutto della medema grauità, queſte non poſſino veri-<lb/>ficarſi ſe non nel modo dichiarato _nel primo Dial pag_. </s>
  <s xml:id="echoid-s4729" xml:space="preserve">31. <lb/></s>
  <s xml:id="echoid-s4730" xml:space="preserve">cioè perche eſſendo più alto il cilindro d’acqua, che ſuc-<lb/>ceſſiuamente ſegue a ſpingerla, li da più ſpinte; </s>
  <s xml:id="echoid-s4731" xml:space="preserve">nulladime-<lb/>no a queſto propoſito ſi potrebbe fare queſt’eſperienza. </s>
  <s xml:id="echoid-s4732" xml:space="preserve">Si <lb/>prendino doi canne di diuerſe lunghezze, vna per eſempio
<pb o="65" file="00159" n="159" rhead="_QVARTO_."/>
di 6. </s>
  <s xml:id="echoid-s4733" xml:space="preserve">braccia, &amp; </s>
  <s xml:id="echoid-s4734" xml:space="preserve">vna d’vno, e ſe li ponghi vna pallina, come <lb/>nell’e ſperienza del Sig. </s>
  <s xml:id="echoid-s4735" xml:space="preserve">Rinaldini regiſtrata, _nel pr. </s>
  <s xml:id="echoid-s4736" xml:space="preserve">Dial. </s>
  <s xml:id="echoid-s4737" xml:space="preserve">no-_ <lb/>_ſtro pag. </s>
  <s xml:id="echoid-s4738" xml:space="preserve">27_. </s>
  <s xml:id="echoid-s4739" xml:space="preserve">e notiſi il tempo che aſcenderà il primo brac-<lb/>cio in quella di 6. </s>
  <s xml:id="echoid-s4740" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s4741" xml:space="preserve">il braccio in quella di vno; </s>
  <s xml:id="echoid-s4742" xml:space="preserve">poiche que-<lb/>ſti tempi credo che ſarãno ritrouati vguali. </s>
  <s xml:id="echoid-s4743" xml:space="preserve">E la ragione lo <lb/>perſuade. </s>
  <s xml:id="echoid-s4744" xml:space="preserve">Perche nelli moti all’ingiù il medemo ſpatio è <lb/>paſſato dal principio del moto più alto, e più baſſo che ſia <lb/>il mobile, nel medemo tempo. </s>
  <s xml:id="echoid-s4745" xml:space="preserve">Adunque pare che coſi <lb/>anco doueſſe ſuccedere nell’eſtruſione. </s>
  <s xml:id="echoid-s4746" xml:space="preserve">Principij a muo-<lb/>uerſi la pietra dalla cima della torre, ò dal mezzo, ſcorrerà <lb/>il primo braccio nel medemo tempo. </s>
  <s xml:id="echoid-s4747" xml:space="preserve">E ſi potrebbe fare <lb/>queſt’eſperienza. </s>
  <s xml:id="echoid-s4748" xml:space="preserve">Nella canna di 6. </s>
  <s xml:id="echoid-s4749" xml:space="preserve">braccia ſi ſommerga <lb/>vna pallina di piombo tenuta con qualche inſtrumento vn <lb/>poco ſotto acqua, ſi che con dilatare ſolo, ò aprire quell’-<lb/>inſtrumento la pallina ſubito diſcendeſſe, e ſi noti il tempo, <lb/>che conſumerà a paſſar vn braccio; </s>
  <s xml:id="echoid-s4750" xml:space="preserve">poi tenuta come ſopra <lb/>ſe ponghi ſotto acqua per 5. </s>
  <s xml:id="echoid-s4751" xml:space="preserve">braccia, e ſe la ſci diſcender pu-<lb/>re per vn braccio, e ſi noti il tempo medemamente. </s>
  <s xml:id="echoid-s4752" xml:space="preserve">Io cre-<lb/>do certo che queſti due tempi ſaranno vguali. </s>
  <s xml:id="echoid-s4753" xml:space="preserve">Coſi adun-<lb/>que nell’eſtruſione io credo che li medemi ſpatii ſijno paſ-<lb/>ſati in tempi vguali da qual ſi voglia luogo principii l’ eſ-<lb/>truſione.</s>
  <s xml:id="echoid-s4754" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4755" xml:space="preserve">_Ofr_. </s>
  <s xml:id="echoid-s4756" xml:space="preserve">Ma io direi in contrario. </s>
  <s xml:id="echoid-s4757" xml:space="preserve">Quanto più l’acqua è alta, tanto <lb/>più preme. </s>
  <s xml:id="echoid-s4758" xml:space="preserve">L’eſperienza la vediamo nella botte piena, che <lb/>quanto più fondo ſi fora, con tanto maggior empito eſce <lb/>il vino, perche ne ha ſopra maggior quantità premente. <lb/></s>
  <s xml:id="echoid-s4759" xml:space="preserve">Così nel noſtro caſo, quanto più alto è il cilindro d’ac-<lb/>qua ſopra il galleggiante, tanto più preme per cac-<lb/>ciarlo.</s>
  <s xml:id="echoid-s4760" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4761" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s4762" xml:space="preserve">L’eſempio non mi par a propoſito; </s>
  <s xml:id="echoid-s4763" xml:space="preserve">perche nella botte, <lb/>dalla parte dalla quale eſce il vino non vi è coſa, che pre-<lb/>mi contro eſſo atta ad impedire l’vſcita; </s>
  <s xml:id="echoid-s4764" xml:space="preserve">perche ſe bene <lb/>contraſta l’aria, &amp; </s>
  <s xml:id="echoid-s4765" xml:space="preserve">impediſce l’empito del vino in <lb/>qualche parte, il quale vſcirebbe con maggior velocìtà, ſe <lb/>ò non foſſe l’aria, ò foſſe più leggiera, e meno premente, <lb/>nulladimeno non può impedire totalmente l’vſcita. </s>
  <s xml:id="echoid-s4766" xml:space="preserve">Ma <lb/>ſopra il galleggiante preme altr’acqua, come habbiamo <lb/>detto _nel cit. </s>
  <s xml:id="echoid-s4767" xml:space="preserve">Dial. </s>
  <s xml:id="echoid-s4768" xml:space="preserve">pag_. </s>
  <s xml:id="echoid-s4769" xml:space="preserve">14. </s>
  <s xml:id="echoid-s4770" xml:space="preserve">E perciò queſta equilibrando l’al-
<pb o="66" file="00160" n="160" rhead="_DIALOGO_"/>
tra ad eſſa vguale nell’altro ſettore, la quale pure pretende <lb/>diſcendere, rende nullo riſpetto il galleggiante il ſuo co-<lb/>nato Vedaſi _il cit. </s>
  <s xml:id="echoid-s4771" xml:space="preserve">luogo nel Dial_. </s>
  <s xml:id="echoid-s4772" xml:space="preserve">e ſi roccara con mano que-<lb/>ſta verità. </s>
  <s xml:id="echoid-s4773" xml:space="preserve">In confirmatione di queſto, &amp; </s>
  <s xml:id="echoid-s4774" xml:space="preserve">in ſimil propoſi-<lb/>to potremo hauere vn’eſempio, &amp; </s>
  <s xml:id="echoid-s4775" xml:space="preserve">eſperienza in vn tubo <lb/>ritorto, nel quale con qualche otturamento ſia impedito <lb/>il bucco, o piegatura oue comunicano le ſue gābe. </s>
  <s xml:id="echoid-s4776" xml:space="preserve">Riẽpita <lb/>vna gamba leueſi l’otturamento; </s>
  <s xml:id="echoid-s4777" xml:space="preserve">ſi vedrà che l’acqua ſalirà <lb/>con grand’empito per l’altra per la preſſione, che fanno <lb/>le parti ſuperiori ſopra l’inferiori e ſeguir à ad aſcen-<lb/>dere ſino che s’equilibrino. </s>
  <s xml:id="echoid-s4778" xml:space="preserve">Ma ſe nell’ altra gamba ſoſſe <lb/>pure infuſa acqua, ma non così alta come nella prima, per <lb/>eſempio ſino al mezzo, cioè più baſſa della prima; </s>
  <s xml:id="echoid-s4779" xml:space="preserve">l’acqua <lb/>pur ſalirà, ma con minor empito, per la contropreſſione, <lb/>che fa l’acqua ſuperiore.</s>
  <s xml:id="echoid-s4780" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4781" xml:space="preserve">_Ofr_. </s>
  <s xml:id="echoid-s4782" xml:space="preserve">Reſto perſuaſo. </s>
  <s xml:id="echoid-s4783" xml:space="preserve">Non facio poi molta ſalſa ſopra le pa-<lb/>role prime del Berigardo, cioè (parlando del fumo, e le-<lb/>gno) che _aſcendit eò remiſſiùs quò proprius accedit ad ſuperfi-_ <lb/>_ciem aquæ_, perche m’arricordo beniſſimo che hauendo <lb/>V. </s>
  <s xml:id="echoid-s4784" xml:space="preserve">S. </s>
  <s xml:id="echoid-s4785" xml:space="preserve">_nel 1. </s>
  <s xml:id="echoid-s4786" xml:space="preserve">Dial. </s>
  <s xml:id="echoid-s4787" xml:space="preserve">pag. </s>
  <s xml:id="echoid-s4788" xml:space="preserve">31_. </s>
  <s xml:id="echoid-s4789" xml:space="preserve">riſpoſto a certo mio dubio, che ha-<lb/>ueuo circa _la prop. </s>
  <s xml:id="echoid-s4790" xml:space="preserve">6. </s>
  <s xml:id="echoid-s4791" xml:space="preserve">d’ Arch. </s>
  <s xml:id="echoid-s4792" xml:space="preserve">de inſid. </s>
  <s xml:id="echoid-s4793" xml:space="preserve">bumid_. </s>
  <s xml:id="echoid-s4794" xml:space="preserve">e che haueuo pro-<lb/>poſto _nella pag_ 29. </s>
  <s xml:id="echoid-s4795" xml:space="preserve">e dalla ſua riſpoſta concludendoſi che <lb/>queſto moto non ſolo non ſi ritardaua nel fine, ma che <lb/>più to ſto s’acceleraua, io confeſſai _ne lla pag_. </s>
  <s xml:id="echoid-s4796" xml:space="preserve">32. </s>
  <s xml:id="echoid-s4797" xml:space="preserve">d’eſſer ſta-<lb/>to perſuaſo dal momento delle ſue ragioni.</s>
  <s xml:id="echoid-s4798" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4799" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s4800" xml:space="preserve">Io reſto molto ammirato come che il Berigardo ſi ſia in-<lb/>gannato in ſimil Fenomeno tanto manifeſto, e patente ad <lb/>ogn’vno. </s>
  <s xml:id="echoid-s4801" xml:space="preserve">Se bene però credo penetrarne la cagione. </s>
  <s xml:id="echoid-s4802" xml:space="preserve">Que. <lb/></s>
  <s xml:id="echoid-s4803" xml:space="preserve">ſta credo eſſer ſtata vn troppo hauerſi cura di non eſſer in-<lb/>gannato dà Ariſtotile. </s>
  <s xml:id="echoid-s4804" xml:space="preserve">Haueua detto queſti _nel 4. </s>
  <s xml:id="echoid-s4805" xml:space="preserve">de celo_. </s>
  <s xml:id="echoid-s4806" xml:space="preserve"><lb/>_Eodem modo feri leuia ſurſum, quo grauia deorſum_. </s>
  <s xml:id="echoid-s4807" xml:space="preserve">Ma queſti di-<lb/>ſcendono più velocemente per l’aria che per l’acqua, e con <lb/>maggior velocità nel fine che nel principio adunque anco <lb/>il ſumo, e legno aſcendono più velocemente per l’aria che <lb/>per l’acqua, e più velocemente nel fine che nel principio. </s>
  <s xml:id="echoid-s4808" xml:space="preserve"><lb/>Volendo adunque aſſerire la falſità di queſto detto in tut-<lb/>to, e per tutto, non è ſtato contento di dire veridicamente, <lb/>che al contrario di quello, che ſuonano le parole d’Ariſto-
<pb o="67" file="00161" n="161" rhead="QVARTO."/>
tile, il fumo, elegno aſcendono più velocemente per l’ac-<lb/>qua, che per l’aria; </s>
  <s xml:id="echoid-s4809" xml:space="preserve">ma anco poi falſamente, che il motoè <lb/>più tardo in fine che in principio.</s>
  <s xml:id="echoid-s4810" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4811" xml:space="preserve">_Cont_. </s>
  <s xml:id="echoid-s4812" xml:space="preserve">Io non voglio dire che il Berigardo ſi ſia ingannato, ſe <lb/>prima V. </s>
  <s xml:id="echoid-s4813" xml:space="preserve">S. </s>
  <s xml:id="echoid-s4814" xml:space="preserve">non ſodisfa ad vna mia inſtanza. </s>
  <s xml:id="echoid-s4815" xml:space="preserve">Dice il Gali-<lb/>leo _nel ſiſt Coſmico Dial. </s>
  <s xml:id="echoid-s4816" xml:space="preserve">1. </s>
  <s xml:id="echoid-s4817" xml:space="preserve">pag. </s>
  <s xml:id="echoid-s4818" xml:space="preserve">latina_ 18 &amp; </s>
  <s xml:id="echoid-s4819" xml:space="preserve">è dottrina comu-<lb/>nemente riceuuta, che _acceleratio motus fit in mobili, quando_ <lb/>_id fertur ad terminum inclinatione naturali deſideratum: </s>
  <s xml:id="echoid-s4820" xml:space="preserve">retarda-_ <lb/>_tio autem oritur per repugnantiam, qua illud ipſum egrè diſcedit_ <lb/>_ac remouetur ab eodem termino_. </s>
  <s xml:id="echoid-s4821" xml:space="preserve">Hora mentre il legno v. </s>
  <s xml:id="echoid-s4822" xml:space="preserve">g. </s>
  <s xml:id="echoid-s4823" xml:space="preserve">è <lb/>ſpinto insù dall’acqua, queſto moto non li è naturale, ma <lb/>violento, mentre è ſpinto dal centro al quale ha inclina-<lb/>tione naturale. </s>
  <s xml:id="echoid-s4824" xml:space="preserve">Adunque queſto moto deue ritardarſi, e <lb/>non accelerarſi; </s>
  <s xml:id="echoid-s4825" xml:space="preserve">altrimente biſognerebbe dire che ſi mo-<lb/>ueſſe all’insù per leggierezza poſitiua; </s>
  <s xml:id="echoid-s4826" xml:space="preserve">coſa negata da <lb/>V. </s>
  <s xml:id="echoid-s4827" xml:space="preserve">S.</s>
  <s xml:id="echoid-s4828" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4829" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s4830" xml:space="preserve">Io non credo chela ritardatione, &amp; </s>
  <s xml:id="echoid-s4831" xml:space="preserve">accelerationenel <lb/>moto delli graui all’insù, &amp; </s>
  <s xml:id="echoid-s4832" xml:space="preserve">all’ingiù ſia tanto di loro eſsen-<lb/>za, che ſenza queſte non poſſino ſuſſiſtere; </s>
  <s xml:id="echoid-s4833" xml:space="preserve">mentre ſtimo <lb/>che ſi ritrouino in eſſi per accidente; </s>
  <s xml:id="echoid-s4834" xml:space="preserve">e che tutto dipenda <lb/>dal modo di principiar queſti moti, e dal come li ſiano cō-<lb/>feriti, e li eſercitino. </s>
  <s xml:id="echoid-s4835" xml:space="preserve">Quando l’Aquila homicidiale del po-<lb/>uero Eſchilo, tenendo la Teſtudine trà li artigli, preſeil <lb/>volo all’insù, queſto moto (parlando al modo di V. </s>
  <s xml:id="echoid-s4836" xml:space="preserve">S.) </s>
  <s xml:id="echoid-s4837" xml:space="preserve">era <lb/>alla Teſtudine violento, mētre era rimoſſa dal centro delle <lb/>coſe graui. </s>
  <s xml:id="echoid-s4838" xml:space="preserve">E pure è manifeſto che l’Aquila poteua aſcen-<lb/>dere con moto, &amp; </s>
  <s xml:id="echoid-s4839" xml:space="preserve">equabile, e ritardato, &amp; </s>
  <s xml:id="echoid-s4840" xml:space="preserve">acceletato. </s>
  <s xml:id="echoid-s4841" xml:space="preserve">Co-<lb/>sì ſe foſſe ritornata verſo laterra, ilmoto all’ingiù ſarebbe <lb/>ſtato naturale alla Teſtudine, mentre s’accoſtaua al cen-<lb/>tro; </s>
  <s xml:id="echoid-s4842" xml:space="preserve">e pure poteua diſcendere in tutti trè li predetti modi. <lb/></s>
  <s xml:id="echoid-s4843" xml:space="preserve">Ecco adunque che ambidue queſti moti poſſono eſſer mo-<lb/>dificati in tutte trè le predette guiſe; </s>
  <s xml:id="echoid-s4844" xml:space="preserve">e che habbino più vn <lb/>modo che l’altro, naſce altronde, cioè dal modo d’eſſerli <lb/>conferito queſto moto. </s>
  <s xml:id="echoid-s4845" xml:space="preserve">Ma perche comunemente li graui <lb/>non ſi ſcoſtano dal centro che per proiettione, e non s’ac-<lb/>coſtano ſe non per diſceſa principiata dopò la remotione <lb/>di cauſa impediente, nelliquali caſi riceuono le modifica-<lb/>tioni di ritardamento in quello all’insù, e d’acceleramento
<pb o="68" file="00162" n="162" rhead="DIALOGO"/>
in queſto all’ingiù, quindi è che così ſi parla comunemẽte. <lb/></s>
  <s xml:id="echoid-s4846" xml:space="preserve">Anzi che anco in queſto modo di prencipiar il graue il mo <lb/>to all’ingiù io non credo che eſſo ſempre ſeguiſſe ad acce-<lb/>lerare il ſuo moto, il quale di propria natura ſi ridurebbe <lb/>all’equabile. </s>
  <s xml:id="echoid-s4847" xml:space="preserve">Queſta dottrina l’hò ſpiegata abbondante-<lb/>mente _nelle quarte Conſid contro l’Apologia del P. </s>
  <s xml:id="echoid-s4848" xml:space="preserve">Riccioli. </s>
  <s xml:id="echoid-s4849" xml:space="preserve">Dial._ </s>
  <s xml:id="echoid-s4850" xml:space="preserve"><lb/>_7. </s>
  <s xml:id="echoid-s4851" xml:space="preserve">principiando alla pag_. </s>
  <s xml:id="echoid-s4852" xml:space="preserve">54. </s>
  <s xml:id="echoid-s4853" xml:space="preserve">ſi veda iui, perche la conſideratio-<lb/>ne non mi pare ſprezzabile.</s>
  <s xml:id="echoid-s4854" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4855" xml:space="preserve">_Ofr_. </s>
  <s xml:id="echoid-s4856" xml:space="preserve">Anch’io voglio entrare in queſta diſputa. </s>
  <s xml:id="echoid-s4857" xml:space="preserve">Mi diea in gra-<lb/>tia Sig. </s>
  <s xml:id="echoid-s4858" xml:space="preserve">Conte; </s>
  <s xml:id="echoid-s4859" xml:space="preserve">perche quando il braccio ſcaglia in alto vn <lb/>graue, quel moto languiſce?</s>
  <s xml:id="echoid-s4860" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4861" xml:space="preserve">_Cont_. </s>
  <s xml:id="echoid-s4862" xml:space="preserve">Perche la virtù impreſſa (così nominiamola) languiſce <lb/>anch’eſſa.</s>
  <s xml:id="echoid-s4863" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4864" xml:space="preserve">_Ofr_. </s>
  <s xml:id="echoid-s4865" xml:space="preserve">E ſe il braccio conferente l’empito ſi ſtaccaſſe dalla ſpalla, <lb/>e ſeguitando il mobile li conferiſce il medemo empito; </s>
  <s xml:id="echoid-s4866" xml:space="preserve">ò <lb/>pure ſempre ſuccedeſſero nuoui bracci, che con vna conti-<lb/>nua ſucceſſione lo ſcagliaſsero con la medem a forza, cre-<lb/>de lei, che il moto del graue ſcemaſſe, e languiſce?</s>
  <s xml:id="echoid-s4867" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4868" xml:space="preserve">_Cont_. </s>
  <s xml:id="echoid-s4869" xml:space="preserve">Anzi al contrario, più toſto ſempre più ſe velocitareb-<lb/>be, mentre li ſucceſſiui ſcagliamenti ritrouandolo in <lb/>moto, opererebbero più efficacemente. </s>
  <s xml:id="echoid-s4870" xml:space="preserve">Almeno certo non <lb/>languirebbe.</s>
  <s xml:id="echoid-s4871" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4872" xml:space="preserve">_Ofr_. </s>
  <s xml:id="echoid-s4873" xml:space="preserve">Ecco adunque che in queſto modo non ſi ritarderebbe il <lb/>moto. </s>
  <s xml:id="echoid-s4874" xml:space="preserve">Mà perche ne li bracci continuamente ſuccedono, <lb/>ne il braccio ſcagliante ſtaccato dalla ſua ſpalla ſegue con-<lb/>tinuamente il mobile, perciò il moto languiſce. </s>
  <s xml:id="echoid-s4875" xml:space="preserve">Non coſi <lb/>ſuccede al galleggiante, ſpinto insù dall’acqua; </s>
  <s xml:id="echoid-s4876" xml:space="preserve">poiche co-<lb/>me ha detto il Sig. </s>
  <s xml:id="echoid-s4877" xml:space="preserve">Profeſſore _nel Dial. </s>
  <s xml:id="echoid-s4878" xml:space="preserve">1. </s>
  <s xml:id="echoid-s4879" xml:space="preserve">pag. </s>
  <s xml:id="echoid-s4880" xml:space="preserve">31_. </s>
  <s xml:id="echoid-s4881" xml:space="preserve">principian-<lb/>do l’acqua a ſpingerlo insù, altre acque ad eſſa vguali con-<lb/>nuamente ſuccedono.</s>
  <s xml:id="echoid-s4882" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4883" xml:space="preserve">Onde eſſendo accompagnato ſempre da ſucceſſiue cauſe <lb/>ſpingenti vguali, biſogna anco che il ſuo moto ſempre più <lb/>s’acceleri; </s>
  <s xml:id="echoid-s4884" xml:space="preserve">e tanto più, quanto più lunga è la ſalita. </s>
  <s xml:id="echoid-s4885" xml:space="preserve">Alme-<lb/>no non ſi ritardi. </s>
  <s xml:id="echoid-s4886" xml:space="preserve">Leuata però ſempre la maggior conſti-<lb/>patione dell’acqua più fonda; </s>
  <s xml:id="echoid-s4887" xml:space="preserve">che eſſendo pochiſſima in <lb/>tutti li caſi, non può fare gran differenza.</s>
  <s xml:id="echoid-s4888" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4889" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s4890" xml:space="preserve">Già che V. </s>
  <s xml:id="echoid-s4891" xml:space="preserve">S. </s>
  <s xml:id="echoid-s4892" xml:space="preserve">ha toccato queſte dottrine ſtabilite _nel pri-_ <lb/>_mo Dial_. </s>
  <s xml:id="echoid-s4893" xml:space="preserve">anch’io repeterò quello, ch’hò detto _nel medemo alla_
<pb o="69" file="00163" n="163" rhead="QVARTO."/>
_pag. </s>
  <s xml:id="echoid-s4894" xml:space="preserve">13_. </s>
  <s xml:id="echoid-s4895" xml:space="preserve">e ciò per più piena’cõfuttatione delle parole delSig. <lb/></s>
  <s xml:id="echoid-s4896" xml:space="preserve">Berigardo ſopradette; </s>
  <s xml:id="echoid-s4897" xml:space="preserve">cioè _Proinde celerius moueri debet ex_ <lb/>_profundiori loco, vnde plures aquæ partes eam ſurſumimpellunt_. </s>
  <s xml:id="echoid-s4898" xml:space="preserve">Se <lb/>egli intẽde che le parti dell’acqua AGMB (vedaſſi la figura <lb/>a carte 37.) </s>
  <s xml:id="echoid-s4899" xml:space="preserve">tutte in vna volta ſpingano insù il galleggiante <lb/>LMPO, come altri hanno penſato, e non ſolo ſucceſſiua-<lb/>mente, come habbiamo detto, credo che s’inganni: </s>
  <s xml:id="echoid-s4900" xml:space="preserve">perche <lb/>è vero che tutta l’acqua AGMB, per eſempio, fà forza per <lb/>diſcendere, ma è anco vero che tutto il compoſto BMPD, <lb/>fà pur forza per diſcendere, E perche AFLB, e BLOD, <lb/>ſono vguali, e fãno vguali conati; </s>
  <s xml:id="echoid-s4901" xml:space="preserve">ſe pareggiano, ne LMPO <lb/>in queſto ſito ſente punto la forza di AFLB, ma ſolo quel-<lb/>la di FGML; </s>
  <s xml:id="echoid-s4902" xml:space="preserve">e così ſucceſſiuamente in tutti li luoghi. </s>
  <s xml:id="echoid-s4903" xml:space="preserve">A-<lb/>dunque poco importa che l’acqua ſia più alta, ò più baſſa, <lb/>ſe non ſucceſſiuamente, in quanto la più alta continua più <lb/>à ſpingere; </s>
  <s xml:id="echoid-s4904" xml:space="preserve">e perciò introduce forſe maggior celerità; </s>
  <s xml:id="echoid-s4905" xml:space="preserve">e <lb/>tanto la più alta quanto la più baſſa maggior in fine che in <lb/>principio. </s>
  <s xml:id="echoid-s4906" xml:space="preserve">Ma che occorre à multiplicar tante parole, mẽ-<lb/>tre vi ſono l’eſperienze, che fanno per noi? </s>
  <s xml:id="echoid-s4907" xml:space="preserve">Il famoſiſſi-<lb/>mo P. </s>
  <s xml:id="echoid-s4908" xml:space="preserve">Riccioli _nellib. </s>
  <s xml:id="echoid-s4909" xml:space="preserve">dell’Almag. </s>
  <s xml:id="echoid-s4910" xml:space="preserve">cap_. </s>
  <s xml:id="echoid-s4911" xml:space="preserve">16. </s>
  <s xml:id="echoid-s4912" xml:space="preserve">_pag_. </s>
  <s xml:id="echoid-s4913" xml:space="preserve">391. </s>
  <s xml:id="echoid-s4914" xml:space="preserve">ha tentato <lb/>queſt’ eſperienza in vna canna di vetro ſimile a quella del <lb/>Sig. </s>
  <s xml:id="echoid-s4915" xml:space="preserve">Rinaldini, della quale habbiamo parlato _nel Dial_. </s>
  <s xml:id="echoid-s4916" xml:space="preserve">1. </s>
  <s xml:id="echoid-s4917" xml:space="preserve"><lb/>_pag_. </s>
  <s xml:id="echoid-s4918" xml:space="preserve">27. </s>
  <s xml:id="echoid-s4919" xml:space="preserve">e diuiſa la ſua altezza, che era di 3. </s>
  <s xml:id="echoid-s4920" xml:space="preserve">piedi in due par-<lb/>ti vguali, e riempitela d’acqua; </s>
  <s xml:id="echoid-s4921" xml:space="preserve">laſciando vn piccolo ſpatio <lb/>capace d’vn poco d’aria vna volta, e d’vn poco d’aria, &amp; </s>
  <s xml:id="echoid-s4922" xml:space="preserve">o-<lb/>glio vn’altra, oſſeruò l’aſceſa per eſſa, e dell’aria, e dell’o-<lb/>glio. </s>
  <s xml:id="echoid-s4923" xml:space="preserve">L’aria ſalìla prima metà in 30. </s>
  <s xml:id="echoid-s4924" xml:space="preserve">vibrationi d’vn pendo-<lb/>lo, e la ſeconda in 24. </s>
  <s xml:id="echoid-s4925" xml:space="preserve">cioè più velocemente. </s>
  <s xml:id="echoid-s4926" xml:space="preserve">L’oglio la pri-<lb/>ma in 14. </s>
  <s xml:id="echoid-s4927" xml:space="preserve">la ſeconda 12. </s>
  <s xml:id="echoid-s4928" xml:space="preserve">Coſi fece diuerſe oſſeruationi in <lb/>altre canne con altri galleggianti, e nel pozzo, che potran-<lb/>no dal curioſo eſſer in eſſo vedute, dalle quali conclude, _Le-_ <lb/>_uia corpora in aſcenſu naturli per aquam ita inæqualiter moueri,_ <lb/>_vt velocius moueantur; </s>
  <s xml:id="echoid-s4929" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s4930" xml:space="preserve">priorem medietatem ſpatij longori_ <lb/>_tempore pertranſeant, quam poſteriorem_.</s>
  <s xml:id="echoid-s4931" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4932" xml:space="preserve">_Cont_. </s>
  <s xml:id="echoid-s4933" xml:space="preserve">Quanto alle ſalite diuerſe dell’aria per l’acqua, belliſſi-<lb/>mo modo d’eſperimentarle ſe ne può raccogliore dal vaſo <lb/>del Sig. </s>
  <s xml:id="echoid-s4934" xml:space="preserve">Sinclaro, del quale habbiamo ſopra parlato a car-<lb/>te 49. </s>
  <s xml:id="echoid-s4935" xml:space="preserve">Poiche ſe notato quanto queſto ſia ſommerſo; </s>
  <s xml:id="echoid-s4936" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s4937" xml:space="preserve">al-
<pb o="70" file="00164" n="164" rhead="DIALOGO"/>
zandolo vn pochino notaremo con eſatti pendoli li tem-<lb/>pi, che conſumaral aria in diuerſe ſommerſioni a ſalire; <lb/></s>
  <s xml:id="echoid-s4938" xml:space="preserve">haueremo con che proportione di tempi paſſi diuerſi <lb/>ſpatij.</s>
  <s xml:id="echoid-s4939" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4940" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s4941" xml:space="preserve">Anch’io hò fatto l’eſperienze, che dice il P. </s>
  <s xml:id="echoid-s4942" xml:space="preserve">Riccioli con <lb/>il tubo di vetro pieno d’acqua con aria, oglio, &amp; </s>
  <s xml:id="echoid-s4943" xml:space="preserve">vna pallina <lb/>di cera, &amp; </s>
  <s xml:id="echoid-s4944" xml:space="preserve">hò oſſeruato diuerſe ſtrauaganze; </s>
  <s xml:id="echoid-s4945" xml:space="preserve">ma in partico-<lb/>lare miè ſem pre riuſcito di non eſperimentare il moto più <lb/>tardo in fine, che in principio; </s>
  <s xml:id="echoid-s4946" xml:space="preserve">anzi più toſto ſempre qual-<lb/>che acceleratione. </s>
  <s xml:id="echoid-s4947" xml:space="preserve">Ma però queſte coſe richiedono mag-<lb/>gior diſtintione. </s>
  <s xml:id="echoid-s4948" xml:space="preserve">Baſti che la ragione, &amp; </s>
  <s xml:id="echoid-s4949" xml:space="preserve">eſperienza dimo-<lb/>ſtra non eſſer queſto moto più tardo in fine che in prin-<lb/>cipio.</s>
  <s xml:id="echoid-s4950" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4951" xml:space="preserve">_Ofr_. </s>
  <s xml:id="echoid-s4952" xml:space="preserve">Se vi ſono dell’eſperienze, che prouano velocitarſi que. <lb/></s>
  <s xml:id="echoid-s4953" xml:space="preserve">ſto moto, ve ne ſono anco, che prouano ritardarſi. </s>
  <s xml:id="echoid-s4954" xml:space="preserve">Così <lb/>ſuccede al fumo eſtruſo per l’aria; </s>
  <s xml:id="echoid-s4955" xml:space="preserve">che perciò il Berigardo <lb/>_nel medemo luogo pag_. </s>
  <s xml:id="echoid-s4956" xml:space="preserve">25. </s>
  <s xml:id="echoid-s4957" xml:space="preserve">dopò hauer detto, che il fumo aſ-<lb/>cende più velocemẽte per l’acqua che per l’aria, ſoggion-<lb/>ge, _Hoc quiuis obſeruare poteſt, vt ego Pariſiijs in deflagatione_ <lb/>_pontium, qui obſorti aquis longo poſt tempore craſſum fumum &amp;_</s>
  <s xml:id="echoid-s4958" xml:space="preserve"> <lb/>_ignis vortices emittebant, erumpebat fumus ex aquis velociſſime_, <lb/>_ſed in aere lentè aſcendebat, &amp; </s>
  <s xml:id="echoid-s4959" xml:space="preserve">quò altiùs, eò lentius, &amp; </s>
  <s xml:id="echoid-s4960" xml:space="preserve">c_.</s>
  <s xml:id="echoid-s4961" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4962" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s4963" xml:space="preserve">ſaria meglio caro Sig. </s>
  <s xml:id="echoid-s4964" xml:space="preserve">Ofredi che V. </s>
  <s xml:id="echoid-s4965" xml:space="preserve">S. </s>
  <s xml:id="echoid-s4966" xml:space="preserve">faceſse dire al Sig. <lb/></s>
  <s xml:id="echoid-s4967" xml:space="preserve">Berigardo come eſperienza in contrario, che il legno fi-<lb/>nalmente vſcito dall’acqua ſi ferma affatto. </s>
  <s xml:id="echoid-s4968" xml:space="preserve">E ſpinto il gal-<lb/>leggiante insù dal mezzo ſempre con maggior velocità <lb/>(almeno non con minore,) ſino che queſto è della mede-<lb/>ma natura, &amp; </s>
  <s xml:id="echoid-s4969" xml:space="preserve">eccede il galleggiante con il medemo ecceſ-<lb/>ſo di grauità, non quando queſto ecceſſo ſcema. </s>
  <s xml:id="echoid-s4970" xml:space="preserve">Io credo <lb/>che V. </s>
  <s xml:id="echoid-s4971" xml:space="preserve">S. </s>
  <s xml:id="echoid-s4972" xml:space="preserve">non hauerà difficoltà in concedere, che ſe il mez-<lb/>zo conteneſſe prima acqua comune; </s>
  <s xml:id="echoid-s4973" xml:space="preserve">ſopra oglio; </s>
  <s xml:id="echoid-s4974" xml:space="preserve">e ſopra <lb/>ſpirito di vino, che vn galleggiante più leggiero di tutti a-<lb/>ſcenderebbe più velocemente per l’acqua; </s>
  <s xml:id="echoid-s4975" xml:space="preserve">meno per l’o-<lb/>glio; </s>
  <s xml:id="echoid-s4976" xml:space="preserve">e moito meno per il ſpirito di uino; </s>
  <s xml:id="echoid-s4977" xml:space="preserve">e ſempre tanto <lb/>più tardo, quanto queſto mezzo meno eccedeſſe; </s>
  <s xml:id="echoid-s4978" xml:space="preserve">di modo <lb/>che ſe più toſto foſſe ecceduto che eccedeſſe; </s>
  <s xml:id="echoid-s4979" xml:space="preserve">il galleggian-<lb/>te non ſolo non aſcenderebbe, ma ſe foſſe portato da em <lb/>pito concepito a ſalir in eſſo, di nuouo diſcenderebbe. </s>
  <s xml:id="echoid-s4980" xml:space="preserve">Coſi
<pb o="71" file="00165" n="165" rhead="QVARTO."/>
vediamo che il legno, che ſaglie per l’acqua, port a to dall <lb/>empito fuori d’eſſa nell’aria, torna ad immergerſi nell’ac-<lb/>qua; </s>
  <s xml:id="echoid-s4981" xml:space="preserve">ma arriuato all’aria che aſſai aſſai meno l’eccede in <lb/>grauità languiſce queſto moto ſin’a tanto che ſi muoua <lb/>con moto proportionato all’ecceſſo della grauità dell’aria <lb/>ſopra la propria E perche l’aria non eſſendo da per tutto <lb/>vniformemente graue, non preme, e ſcaccia vgualmen-<lb/>te, ma meno quanto più ſi và in alto, quindi è che final-<lb/>mente il fumo nelluogo, oue è graue quanto eſſa ſi fer-<lb/>ma.</s>
  <s xml:id="echoid-s4982" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s4983" xml:space="preserve">_Ofr_. </s>
  <s xml:id="echoid-s4984" xml:space="preserve">Il moto delli graui all’ingiù ſi velocita di modo che li <lb/>ſpatii paſſati ſiino come li quadrati delli tempi, come è già <lb/>coſa famoſa, oſſeruata prima dal Galileo, e poi da tanti al-<lb/>tri; </s>
  <s xml:id="echoid-s4985" xml:space="preserve">mentre adunque il moto d’eſtruſione delli galleggian-<lb/>ti ſi và anco eſſo velocitando deſidero ſapere ſe ſi velocita <lb/>con la proportion medema delli quadrati delli tempi.</s>
  <s xml:id="echoid-s4986" xml:space="preserve"/>
</p>
<p style="it">
  <s xml:id="echoid-s4987" xml:space="preserve">Mat. </s>
  <s xml:id="echoid-s4988" xml:space="preserve">_Sodisfa il medemo P. </s>
  <s xml:id="echoid-s4989" xml:space="preserve">Riccioli al ſuo deſiderio_ nel luogo <lb/>citato pagina 362. </s>
  <s xml:id="echoid-s4990" xml:space="preserve">numero 21. </s>
  <s xml:id="echoid-s4991" xml:space="preserve">così. </s>
  <s xml:id="echoid-s4992" xml:space="preserve">Ex octauæ claſſis experimen-<lb/>tis ſatis conſtat leuia corpora à nobis adhibita, non ita, in aſcen-<lb/>ſum per aquam creſcere, vt ſpatia confecta ſe habeant inter ſe <lb/>ut quadrata temporum; </s>
  <s xml:id="echoid-s4993" xml:space="preserve">ſed quadratum totius temporis, quo per-<lb/>tranſiti ſunt pedes 14. </s>
  <s xml:id="echoid-s4994" xml:space="preserve">multo plus duplo eſſe ad quadratum tem-<lb/>poris, quo pertranſiti ſunt pedes 7. </s>
  <s xml:id="echoid-s4995" xml:space="preserve">_E poco doppo ſoggiun-_ <lb/>_ge_. </s>
  <s xml:id="echoid-s4996" xml:space="preserve">Itaque proportio, quam huiuſmodi corpora ſeruant, incon-<lb/>ſtans eſt, nam in aliquibus videtur tempus primi ſpatij æqualis ad <lb/>tempus ſecundi ſpatii æqualis eſſe vt 4. </s>
  <s xml:id="echoid-s4997" xml:space="preserve">a 3. </s>
  <s xml:id="echoid-s4998" xml:space="preserve">In aliquibus ut 5. </s>
  <s xml:id="echoid-s4999" xml:space="preserve">ad 4. <lb/></s>
  <s xml:id="echoid-s5000" xml:space="preserve">in aliquibus æqualitati proprius, ſeu vt 10. </s>
  <s xml:id="echoid-s5001" xml:space="preserve">ad 9. </s>
  <s xml:id="echoid-s5002" xml:space="preserve">&amp;</s>
  <s xml:id="echoid-s5003" xml:space="preserve">c.</s>
  <s xml:id="echoid-s5004" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5005" xml:space="preserve">_Ofr_. </s>
  <s xml:id="echoid-s5006" xml:space="preserve">Ma mi naſce altra curioſità di ſapere perche non aſcen-<lb/>dono, ò ſono eſtruſi dimodo che li ſpatii paſſati ſiino a <lb/>puntino come li quadrati delli tempi, come diſcendono li <lb/>graui, &amp;</s>
  <s xml:id="echoid-s5007" xml:space="preserve">c.</s>
  <s xml:id="echoid-s5008" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5009" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s5010" xml:space="preserve">Per quanto vedo Signor Ofredi li vengono più voglie <lb/>che alle donne pregne. </s>
  <s xml:id="echoid-s5011" xml:space="preserve">Il medemo P. </s>
  <s xml:id="echoid-s5012" xml:space="preserve">Ricciolo pure poco <lb/>doppo dice, che la cauſa _vnica aut potiſſima eſt longe minor ex-_ <lb/>_ceſſus grauitatis aquæ ſupra grauitatem prædictorum corporum_, <lb/>_quam ſit exceſſus grauitatis sphæræ metallicæ, aut lapideæ ſupra_ <lb/>_grauitatem aquæ aut grauitatem noſtriaeris. </s>
  <s xml:id="echoid-s5013" xml:space="preserve">At ſi inuenirentur_ <lb/>_corpora tantò leuiora aqua, quantò corpora metallica, vel lapidea_
<pb o="72" file="00166" n="166" rhead="_DIALOGO_"/>
_ſuntgrauiora quam aqua, nedum aere; </s>
  <s xml:id="echoid-s5014" xml:space="preserve">tunc valdè probabiliter eſt_ <lb/>_incrementum velocitatis fore ſecundum quadrata temporum_ <lb/>&amp;</s>
  <s xml:id="echoid-s5015" xml:space="preserve">c.</s>
  <s xml:id="echoid-s5016" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5017" xml:space="preserve">_Ofr_. </s>
  <s xml:id="echoid-s5018" xml:space="preserve">Se non vi è altra riſpoſta da ſatiar il mio appetito, al ſi-<lb/>curo che ſe io foſſi vna donna pregna, come ſcherza V. </s>
  <s xml:id="echoid-s5019" xml:space="preserve">S. <lb/></s>
  <s xml:id="echoid-s5020" xml:space="preserve">farei il parto ſegnato. </s>
  <s xml:id="echoid-s5021" xml:space="preserve">Perche certo con maggior ecceſſo <lb/>di grauità eccede l’acqua l’aria pura, che li metalli, e pietre <lb/>l’acqua. </s>
  <s xml:id="echoid-s5022" xml:space="preserve">E pure l’aria nell’eſſer eſtruſa non oſſerua ne lli ſpa <lb/>tii paſſati li quadrati delli tempi. </s>
  <s xml:id="echoid-s5023" xml:space="preserve">Coſi eccede di maggior <lb/>ecceſſo l’acqua in grauità li altri corpi con li quali eſſo hà <lb/>eſperimentato, che tanti più graui dell’acqua non eccedo-<lb/>no eſſa; </s>
  <s xml:id="echoid-s5024" xml:space="preserve">e pure quelli non aſcendono li ſpatii come li qua-<lb/>drati delli tempi, e queſti li deſcenderanno. </s>
  <s xml:id="echoid-s5025" xml:space="preserve">L’ecceder il <lb/>corpo graue il mezzo per il quale deue diſcendere di poco <lb/>in grauità, non fà che ſi muti la proportione delli quadrati <lb/>delli tẽpi nelli ſpatii paſſati, ma ſolo che queſti ſpatii ſiino <lb/>minori paragonati cõ li paſſati da corpi più graui nelli me <lb/>demi tempi. </s>
  <s xml:id="echoid-s5026" xml:space="preserve">Tutti però queſti ſpatii ſono frà ſe proportio <lb/>nali, mentre ſono proportionali alli quadrati delli tempi. </s>
  <s xml:id="echoid-s5027" xml:space="preserve"><lb/>Tanto douerebbe ſuccedere alli corpi leggieri, ſe queſti <lb/>aſcendeſſero per leggierezza poſitiua; </s>
  <s xml:id="echoid-s5028" xml:space="preserve">che quanto più foſ-<lb/>ſero leggieri del mezzo aſcendeſſero più velocemente; </s>
  <s xml:id="echoid-s5029" xml:space="preserve">ma <lb/>però che li ſpatii paſſati da tutti foſſero come li quadrati <lb/>delli tempi. </s>
  <s xml:id="echoid-s5030" xml:space="preserve">In ſomma queſta riſpoſta del P. </s>
  <s xml:id="echoid-s5031" xml:space="preserve">Riccioli ha <lb/>ſuegliato in me deſiderio maggiore di ſaperne qualche <lb/>cauſa più veriſſimile.</s>
  <s xml:id="echoid-s5032" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5033" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s5034" xml:space="preserve">Per vedere, che il parto de V. </s>
  <s xml:id="echoid-s5035" xml:space="preserve">S non naſca deturpato com<unsure/> <lb/>qualche machia, me cimenterò io d’incontrarne vna forſe <lb/>maggiore. </s>
  <s xml:id="echoid-s5036" xml:space="preserve">Già parmi conſtare da quanto da noi è ſtato al-<lb/>tre volte detto, che il legno v. </s>
  <s xml:id="echoid-s5037" xml:space="preserve">g. </s>
  <s xml:id="echoid-s5038" xml:space="preserve">ſaliſce per l’acqua per la <lb/>ſola eſtruſione che li fà l’acqua deſcendendo, e non per leg-<lb/>gerezza poſitiua, la quale non darſi douerebbe pure il P <lb/>Riccioli imparare da queſte ſue eſperienze; </s>
  <s xml:id="echoid-s5039" xml:space="preserve">mentre queſt <lb/>ſuoi corpi non ſaliſcono con la proportione de quadrati <lb/>de tempi, come douerebbe ſuccedere. </s>
  <s xml:id="echoid-s5040" xml:space="preserve">A dunque non puà <lb/>eſter eſtruſo per ſpatii, che habbino la proportione delli <lb/>quadrati delli tempi, ſe l’acqua non diſcende con queſta <lb/>velocità. </s>
  <s xml:id="echoid-s5041" xml:space="preserve">Biſogna adunque indagare perche l’acqua fatta
<pb o="73" file="00167" n="167" rhead="_QVARTO._"/>
ſalire con l’immerſione di corpo, che da ſe poſſi ſcacciare, <lb/>non diſcenda con quella proportione. </s>
  <s xml:id="echoid-s5042" xml:space="preserve">Et à queſto propo-<lb/>ſito io oſſeruo che tutte l’eſperienze addotte ſin’hora dell’ <lb/>acquiſto di queſte velocità, cioè de ſpatii paſſati come li <lb/>quadrati de tempi, ſono ſtate fatte con corpi, che eſſi, e <lb/>le ſue parti ſeguitano a muouerſi dal principio del moto <lb/>ſino al fine, non con corpi, che ſi muouino ſucceſſiua men-<lb/>te a parte per parte, come fà l’acqua deſcendendo per eſ-<lb/>truder il galleggiante.</s>
  <s xml:id="echoid-s5043" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5044" xml:space="preserve">_Ofr_. </s>
  <s xml:id="echoid-s5045" xml:space="preserve">Di queſto ſuo diſcorſo non n’intendo parola.</s>
  <s xml:id="echoid-s5046" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5047" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s5048" xml:space="preserve">Nella figura à carte 37. </s>
  <s xml:id="echoid-s5049" xml:space="preserve">ſia il galleggianre L M P O, <lb/>ſommerſo nell’acqua in modó che li ſouraſti l’acqua <lb/>B L O D. </s>
  <s xml:id="echoid-s5050" xml:space="preserve">E manifeſto che rimoſſa la cauſa, che lo <lb/>tien ſommerſo, l’acqua principierà attualmente a di-<lb/>ſcendere, ma non tutta, poiche v. </s>
  <s xml:id="echoid-s5051" xml:space="preserve">g. </s>
  <s xml:id="echoid-s5052" xml:space="preserve">AFLB, nulla <lb/>ſi muoue, ma la prima è la ſola acqua FGLM, che prin-<lb/>cipia a diſcendere, ſuccedendone altre portioni dell’AFLB, <lb/>conforme che il galleggiante è più ſpinto insù E quando <lb/>è arriuato per eſempio in HLON, l’acqua LMOP, non ſi <lb/>muoue più in conto alcuno, ne meno l’FGML, ſucceduta <lb/>nelluogo, che occupaua prima quella; </s>
  <s xml:id="echoid-s5053" xml:space="preserve">e l’acqua AEHB, <lb/>non hà ancora principiato a diſcendere. </s>
  <s xml:id="echoid-s5054" xml:space="preserve">Sempre poi ſucce-<lb/>de nuoua acqua, che partendo dalla quiete, principia a <lb/>muouerſi. </s>
  <s xml:id="echoid-s5055" xml:space="preserve">Pare adunque ragioneuole, che non cſſendo il <lb/>medemo mobile, che ſi muoua per tutto lo ſpatio, ma le <lb/>ſue parti ſucceſſiuamente per ſpatio limitato, &amp; </s>
  <s xml:id="echoid-s5056" xml:space="preserve">al più v-<lb/>guale all’HL; </s>
  <s xml:id="echoid-s5057" xml:space="preserve">che non poſſi ne anco acquiſtarſi quella ve-<lb/>locità corriſpondente alli quadrati delli tempi; </s>
  <s xml:id="echoid-s5058" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s5059" xml:space="preserve">in con-<lb/>ſequenza che in vano poſſi ſperare il. </s>
  <s xml:id="echoid-s5060" xml:space="preserve">P. </s>
  <s xml:id="echoid-s5061" xml:space="preserve">Riccioli ritrouar-<lb/>ſi galleggianti, che poſſino aſcendere con queſta velocità. <lb/></s>
  <s xml:id="echoid-s5062" xml:space="preserve">Se queſta non è la vera cagione di queſto effetto, io non <lb/>ſaprei aſſegnarne altra. </s>
  <s xml:id="echoid-s5063" xml:space="preserve">Il Signor Ofredi accetti il buon <lb/>animo.</s>
  <s xml:id="echoid-s5064" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5065" xml:space="preserve"><gap/>otiſi però da queſte dottrine quanto s’inganni il Sig Beri-<lb/>gardo quando dice, _Proinde celerius moueri debet ex profun-_ <lb/>_dioriloco, vndè plures aquæpartes eam ſurſum impellunt_. </s>
  <s xml:id="echoid-s5066" xml:space="preserve">S’in-<lb/>ganna dico di molto s’intende altrimente che ſucceſſiua-<lb/>mente, come habbiamo detto. </s>
  <s xml:id="echoid-s5067" xml:space="preserve">E per più chiara intelligen-
<pb o="74" file="00168" n="168" rhead="_DIALOGO_"/>
za noteſi, che poco può importare al galleggiante <lb/>LMPO, che l’acqua AGMB, ſia più alta, ò meno, perche <lb/>tutta queſt’acqua non preme insù il gallegiante ſe non ſuc <lb/>ceſsiuamente; </s>
  <s xml:id="echoid-s5068" xml:space="preserve">ne con la ſua ſalita diſcende tutta l’acqua <lb/>in vna volta, ma a parte per parte.</s>
  <s xml:id="echoid-s5069" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5070" xml:space="preserve">Ne occore portarl’ eſempio del Baroſcopio, che in queſte <lb/>baſſe regioni l’aria ſpinge più insù il mercurio, e meno <lb/>nelli monti; </s>
  <s xml:id="echoid-s5071" xml:space="preserve">onde queſte preſſioni ſi fanno ſecondo le <lb/>maggiori, e minori altezze delli cilindri d’aria premēte: </s>
  <s xml:id="echoid-s5072" xml:space="preserve">ne <lb/>meno quello dell’argentouiuo che _nel nostro 2. </s>
  <s xml:id="echoid-s5073" xml:space="preserve">Dial. </s>
  <s xml:id="echoid-s5074" xml:space="preserve">pag_. <lb/></s>
  <s xml:id="echoid-s5075" xml:space="preserve">55. </s>
  <s xml:id="echoid-s5076" xml:space="preserve">ſaliſce più per la fiſtola P V, quanto l’acqua, G C, è <lb/>più alta; </s>
  <s xml:id="echoid-s5077" xml:space="preserve">poiche in queſti caſi è vero, perche alla ſalita del <lb/>mercurio nel Baroſcopio, e nella fiſtola P V, ne ſegue <lb/>la diſceſa di tutte le parti inſieme del cilindro d’aria in <lb/>quello, e dell’acqua in queſti; </s>
  <s xml:id="echoid-s5078" xml:space="preserve">non coſi dell’acqua, che <lb/>ſpinge insù il galleggiante. </s>
  <s xml:id="echoid-s5079" xml:space="preserve">Onde accoſtandoſi al centro <lb/>li cilindri d’aria in quello, e GC, in queſto, tutti inſieme, <lb/>poſſono anco cagionar maggior preſſione quanto ſono <lb/>più alti. </s>
  <s xml:id="echoid-s5080" xml:space="preserve">Coſi ſe faremo due bucchi nella borte vno più <lb/>alto, &amp; </s>
  <s xml:id="echoid-s5081" xml:space="preserve">vno più baſſo, vſcirà il vino con l’empito regolato <lb/>dall’altezza del vino premente; </s>
  <s xml:id="echoid-s5082" xml:space="preserve">perche all’ vſcita d’eſſo <lb/>per l’vno, ol’altro bucco, diſcende quello, che li ſoura ſta <lb/>nel medemo momento di tempo tutto con tutte le ſue <lb/>parti.</s>
  <s xml:id="echoid-s5083" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5084" xml:space="preserve">_Ofr_. </s>
  <s xml:id="echoid-s5085" xml:space="preserve">V. </s>
  <s xml:id="echoid-s5086" xml:space="preserve">S. </s>
  <s xml:id="echoid-s5087" xml:space="preserve">non vede, che già è notte? </s>
  <s xml:id="echoid-s5088" xml:space="preserve">Queſti diſcorſi n’hanno <lb/>fatto paſſare molte hore ſenza accorgerſi. </s>
  <s xml:id="echoid-s5089" xml:space="preserve">La riueriamo, <lb/>&amp; </s>
  <s xml:id="echoid-s5090" xml:space="preserve">a riuederſi ad vn altra più bella.</s>
  <s xml:id="echoid-s5091" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5092" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s5093" xml:space="preserve">Deſcenderemo tutti inſieme le ſcalle, loro Signori per <lb/>partire, &amp; </s>
  <s xml:id="echoid-s5094" xml:space="preserve">10 per ſeruirle.</s>
  <s xml:id="echoid-s5095" xml:space="preserve"/>
</p>
</div>
<div xml:id="echoid-div39" type="section" level="1" n="22">
<head xml:id="echoid-head34" xml:space="preserve">Fine del Quarto Dialogo.</head>
<pb o="75" file="00169" n="169"/>
</div>
<div xml:id="echoid-div40" type="section" level="1" n="23">
<head xml:id="echoid-head35" xml:space="preserve">DIALOGO <lb/>QVINTO.</head>
<p>
  <s xml:id="echoid-s5096" xml:space="preserve">_Of_ PArtii hieri ſera tanto ſatollo dalli noſtri <lb/>paſsati colloquij che io mi credeuo che <lb/>nõ mi doueſſe venit più voglia di diſcor-<lb/>rere per vn gran tẽpo. </s>
  <s xml:id="echoid-s5097" xml:space="preserve">Nulladimeno que <lb/>ſta notte non porendo dormire, &amp; </s>
  <s xml:id="echoid-s5098" xml:space="preserve">an-<lb/>dando penſando a quanto ſù detto, mi <lb/>ſono nati dubij tali, che ſubito fatto <lb/>giorno leuatomi dalletto, ſono anda-<lb/>to à ſuegliare il Signor Conte; </s>
  <s xml:id="echoid-s5099" xml:space="preserve">conil quale ſono venuto <lb/>à riuerirla, &amp; </s>
  <s xml:id="echoid-s5100" xml:space="preserve">inſieme ad arreccarli le ſolite moleſtie.</s>
  <s xml:id="echoid-s5101" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5102" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s5103" xml:space="preserve">Riueriſco pure anch io le Signorie loro; </s>
  <s xml:id="echoid-s5104" xml:space="preserve">pronto a ſeruire <lb/>il Sig. </s>
  <s xml:id="echoid-s5105" xml:space="preserve">Ofredi in tutti li modi; </s>
  <s xml:id="echoid-s5106" xml:space="preserve">perciò diſponga di me à ſuo, <lb/>beneplacito.</s>
  <s xml:id="echoid-s5107" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5108" xml:space="preserve">_Of_. </s>
  <s xml:id="echoid-s5109" xml:space="preserve">Quello che hora deſidero da V. </s>
  <s xml:id="echoid-s5110" xml:space="preserve">S. </s>
  <s xml:id="echoid-s5111" xml:space="preserve">è che ſi compiaccia d’v-<lb/>dire li miei dubij. </s>
  <s xml:id="echoid-s5112" xml:space="preserve">Hieri volendo lei ſtabilire che li gal-<lb/>leggianti aſcendino per il mezzo più graue d’eſſi con mo-<lb/>to, che nel fine non ſia più lento; </s>
  <s xml:id="echoid-s5113" xml:space="preserve">e tardo che nel principio, <lb/>ma più toſto più veloce, arrecco eſperienze fatte dal Dot-<lb/>tiſſimo P. </s>
  <s xml:id="echoid-s5114" xml:space="preserve">Riccioli con vn tubo, ò canna di vetro ripieno <lb/>d’acqua, per la quale aſcendeuano in queſto modo &amp; </s>
  <s xml:id="echoid-s5115" xml:space="preserve">aria, <lb/>&amp; </s>
  <s xml:id="echoid-s5116" xml:space="preserve">oglio. </s>
  <s xml:id="echoid-s5117" xml:space="preserve">Narrò anco li tempi oſſeruati da queſto profondo <lb/>filoſofo della loro aſceſa per le due metà del detto tubo, e <lb/>diſſe, che l’aria ſalì la prima metà in 30. </s>
  <s xml:id="echoid-s5118" xml:space="preserve">vibrationi d vn <lb/>pendolo, e la ſeconda in 24; </s>
  <s xml:id="echoid-s5119" xml:space="preserve">L’oglio poi ſalì la prima metà <lb/>in 14. </s>
  <s xml:id="echoid-s5120" xml:space="preserve">vibrationi, e la ſeconda in 12. </s>
  <s xml:id="echoid-s5121" xml:space="preserve">Sì che l’oglio paſsò la <lb/>prima metà più che il doppio più velocemente, e la ſecon-<lb/>da preciſamente il doppio più velocemente. </s>
  <s xml:id="echoid-s5122" xml:space="preserve">Queſta certo <lb/>parmi vna gran ſtrauaganza; </s>
  <s xml:id="echoid-s5123" xml:space="preserve">perche eſſendo l’aria ò tanto <lb/>più leggiera, ò tanto meno graue dell’oglio; </s>
  <s xml:id="echoid-s5124" xml:space="preserve">ò aſcendino <lb/>queſti per leggierezza poſitiua, ò vengano eſtruſi dall’ac-<lb/>qua più graue, douerebbe certo di gran lunga aſcender più <lb/>velocemente l’aria dell’oglio.</s>
  <s xml:id="echoid-s5125" xml:space="preserve"/>
</p>
<pb o="76" file="00170" n="170" rhead="_DIALOGO_"/>
<p>
  <s xml:id="echoid-s5126" xml:space="preserve">_Cont_. </s>
  <s xml:id="echoid-s5127" xml:space="preserve">Queſta ſtrauaganza è ſtata bene anco auuertita dall’oc-<lb/>culatiſſimo Riccioli, il quale à queſte eſperienze ſubito <lb/>ſoggiunge. </s>
  <s xml:id="echoid-s5128" xml:space="preserve">_Cauſa autem ob quam aer qui celerior eſſe debuit_, <lb/>_tardior tamen fuit oleo, fuit quia aer ſolus raritatem ſuam reti-_ <lb/>_nens per anguſtum fiſtulæ canalem ſic aſcendebat, vt circa ſe_ <lb/>_aquæ in ipſius locum ſuccedenti, tenuiſſimam viam relinqueret:_ <lb/></s>
  <s xml:id="echoid-s5129" xml:space="preserve">_quare cum aqua extenuari deberet morulas temporis requi-_ <lb/>_rebat_.</s>
  <s xml:id="echoid-s5130" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5131" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s5132" xml:space="preserve">Laſcino queſte morule che ancor noi dimoriamo vn <lb/>poco circa queſta materia. </s>
  <s xml:id="echoid-s5133" xml:space="preserve">Deuono adunque ſapere, che <lb/>le predette eſperienze ſono ſtate tentate dal Riccioli in <lb/>occaſione di voler perſuadere al modo litterario, che ſe dia <lb/>leggierezza poſitiua, e che condottida queſta ſaliſcano <lb/>per l’acqua l’aria, &amp; </s>
  <s xml:id="echoid-s5134" xml:space="preserve">oglio, e non perche ſiano eſtruſi dall’-<lb/>acqua più graue. </s>
  <s xml:id="echoid-s5135" xml:space="preserve">Della qual coſa tratta _ex profeſſo nel cit_. <lb/></s>
  <s xml:id="echoid-s5136" xml:space="preserve">_luogo pag_. </s>
  <s xml:id="echoid-s5137" xml:space="preserve">383. </s>
  <s xml:id="echoid-s5138" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s5139" xml:space="preserve">384 Ho nutrito lungo penſiero di eſami-<lb/>nare queſte ſue ragioni; </s>
  <s xml:id="echoid-s5140" xml:space="preserve">ma hauendo comprato in queſti <lb/>giorni il nuouo, &amp; </s>
  <s xml:id="echoid-s5141" xml:space="preserve">eccellente libro del Dottiſſimo Signor <lb/>Gio. </s>
  <s xml:id="echoid-s5142" xml:space="preserve">Alfonſo Borelli _De motionibus natur alibus à grauitate_ <lb/>_pendentibus_, &amp; </s>
  <s xml:id="echoid-s5143" xml:space="preserve">hauendo veduto che _cap. </s>
  <s xml:id="echoid-s5144" xml:space="preserve">4 prop. </s>
  <s xml:id="echoid-s5145" xml:space="preserve">71. </s>
  <s xml:id="echoid-s5146" xml:space="preserve">e per altre_ <lb/>_ſeguenti_, vengono da eſſo confutate, ho conoſciuto eſſer <lb/>ſuperflua la mia fatica. </s>
  <s xml:id="echoid-s5147" xml:space="preserve">Non giudico però vgualmente ſu-<lb/>perfluo narrare à loro Signori fedelmente l’eſperienze <lb/>tentate anco da me in ſimil propoſito.</s>
  <s xml:id="echoid-s5148" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5149" xml:space="preserve">Hò preſo vn tubo di vetro come SX, lungo vn braccio, e <lb/>mezzo in circa delli noſtri, e largo in diametro più della <lb/>larghezza de due vngie del pollice, &amp; </s>
  <s xml:id="echoid-s5150" xml:space="preserve">otturatolo prima <lb/>con veſcica legata in S V, ſtrettiſſimamente, e riempito-<lb/>lo d’acqua, laſciandoli luogo per vn poco d’aria, l hò ſer-<lb/>rato parimente nel medemo modo dalla parte R X; </s>
  <s xml:id="echoid-s5151" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s5152" xml:space="preserve"><lb/>hauendolo riuoltato in ſito perpendicolare all’orizonte, <lb/>hò oſſeruato che l’aria hauendo formato, in compara-<lb/>tione del primo, vn cilindro molto lungo, il quale termi-<lb/>naua di ſopra in figura curua come A B C, e di ſotto in <lb/>circolo poco meno largo del tubo, aſcendeua aſſai lenta. <lb/></s>
  <s xml:id="echoid-s5153" xml:space="preserve">mente, occupando quaſi tutta la larghezza del tubo; </s>
  <s xml:id="echoid-s5154" xml:space="preserve">e <lb/>nel fine aſcendeua vn poco più velocemente che nel prin-<lb/>cipio; </s>
  <s xml:id="echoid-s5155" xml:space="preserve">e nel tempo, che egli a ſcendeua ſi vedeua manife.</s>
  <s xml:id="echoid-s5156" xml:space="preserve">
<pb o="77" file="00171" n="171" rhead="QVINTO."/>
ſtamente diſcender l’acqua all’intorno.</s>
  <s xml:id="echoid-s5157" xml:space="preserve"/>
</p>
  <figure>
    <image file="00171-01" xlink:href="http://echo.mpiwg-berlin.mpg.de/zogilib?fn=/permanent/library/9EXVCG1R/figures/00171-01"/>
  </figure>
<p>
  <s xml:id="echoid-s5158" xml:space="preserve">Et hauendo tentato queſt’eſperienza più vol-<lb/>te voltando, eriuoltando il tubo, accade-<lb/>ua alle volte che non tutta l’aria aſcende-<lb/>ua vnita, &amp; </s>
  <s xml:id="echoid-s5159" xml:space="preserve">in vna ſol volta; </s>
  <s xml:id="echoid-s5160" xml:space="preserve">ma ò ne ri-<lb/>maneſſe qualche poca attaccata alla veſci-<lb/>ca; </s>
  <s xml:id="echoid-s5161" xml:space="preserve">ò penetraſſe per la legatura; </s>
  <s xml:id="echoid-s5162" xml:space="preserve">ò foſſero <lb/>efluuii della medema acqua eccitati dal <lb/>calor delle mani; </s>
  <s xml:id="echoid-s5163" xml:space="preserve">ò che che altro ne foſſe, <lb/>e principiaſſe queſta a ſalire in tempo che <lb/>la prima foſſe ſalita molto ad alto, anco <lb/>paſſata la metà; </s>
  <s xml:id="echoid-s5164" xml:space="preserve">nulladimeno queſta ſe-<lb/>conda occupando nel tubo ſpatio molt’-<lb/>anguſto, aſcendeua con gran velocità; <lb/></s>
  <s xml:id="echoid-s5165" xml:space="preserve">non formando la predetta figura, ma co-<lb/>me vna perletta, ò pallina lucida, la quale <lb/>arriuata all’altra ò ſi confondeua con eſſa; </s>
  <s xml:id="echoid-s5166" xml:space="preserve"><lb/>ò le ſi attaccaua alla baſe A C, di modo che ſe diſtingueua, <lb/>ritenendo dalla parte inferiore la ſua conueſſità.</s>
  <s xml:id="echoid-s5167" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5168" xml:space="preserve">Oſſeruino però che circa queſta figura faitigiata dell’ aria <lb/>A B C, la refrattione cagionata dalla craſſitie del vetro, e <lb/>la poſitura dell’occhio ne hà vna gran parte circa il più e <lb/>meno. </s>
  <s xml:id="echoid-s5169" xml:space="preserve">Poiche collocato l’occhio di ſotto al detto cilindro <lb/>d’aria, hò veduto la faſtigiatione B, molto eminente; </s>
  <s xml:id="echoid-s5170" xml:space="preserve">collo-<lb/>cato al liuello con la cima B, l’ho veduta minore; </s>
  <s xml:id="echoid-s5171" xml:space="preserve">ma col-<lb/>locato di ſopra non vedeuo alcuna conueſſità.</s>
  <s xml:id="echoid-s5172" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5173" xml:space="preserve">Ho poi preſo vn’altro tubo non in altro differente dall’ an-<lb/>tecedente SX, ſe non che era più ſottile, e non era tutto <lb/>largo vgualmente, ma di ſopra dell’S V, terminaua in vna <lb/>mazzocca aſſai capace come vn sferoide, ouero Ouo; </s>
  <s xml:id="echoid-s5174" xml:space="preserve">e <lb/>fatte tutte le coſe come nel precedente, hò oſſeruato che <lb/>ſino che l’acqua aſcendeua per la parte S X, del tubo, ne ſe-<lb/>guiua il medemo come nell’antecedente; </s>
  <s xml:id="echoid-s5175" xml:space="preserve">ma arriuata alla <lb/>parte più larga, non riteneua quella figura curua, e conoi-<lb/>dale, ma facendoſi in vna falda larga, e ſchizza come vna <lb/>fogatia, con gran preſtezza aſcendeua il rimanente. </s>
  <s xml:id="echoid-s5176" xml:space="preserve">Eciò <lb/>tanto ſuccedeua, ò ſaliſce dal più ſtretto nel più largo, ò da <lb/>queſto in quello.</s>
  <s xml:id="echoid-s5177" xml:space="preserve"/>
</p>
<pb o="78" file="00172" n="172" rhead="DIALOGO"/>
<p>
  <s xml:id="echoid-s5178" xml:space="preserve">_Cont._ </s>
  <s xml:id="echoid-s5179" xml:space="preserve">Tanto che non ſempre nell’aſcendere l’aria per l’acque <lb/>ſi faſtigia in figura conoidale, ò curua?</s>
  <s xml:id="echoid-s5180" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5181" xml:space="preserve">_Mat._ </s>
  <s xml:id="echoid-s5182" xml:space="preserve">Non certo nel largo. </s>
  <s xml:id="echoid-s5183" xml:space="preserve">Et à queſto propoſito l’altro gior-<lb/>no in piazza accidentalmente hò veduto appreſſo vn bo-<lb/>tegaio alcune di qúelle ampolline curue, eritonde, che <lb/>riempiono d’acqua con trè, ouero quattro di quelli glo-<lb/>betti di vetro, che hieri diſſi eſſer adoperati dalli ciarlatani, <lb/>le quali ampolline ſerrate al lume, cioè ſigillate herme-<lb/>ticamente, e poi voltate, e riuoltate ſempre moſtrano le <lb/>predette sferette nella parte ſuperiore. </s>
  <s xml:id="echoid-s5184" xml:space="preserve">Hauendo adunque <lb/>oſſeruato che conteneuano dette ampolline oltre all’ ac-<lb/>qua, e sferette, anco vn poco d’aria, preſene vna in mano <lb/>prencipiai a voltarla, e riuoltarla per oſſeruare li moti, e <lb/>figure dell’aria nel ſalire alla parte ſuperiore; </s>
  <s xml:id="echoid-s5185" xml:space="preserve">e vidi che <lb/>que ſta nel ſalire non formaua quella figura curua come <lb/>con oide, ne aſcendaua per il mezzo, ma ò vnita, ò diuiſa <lb/>aſ cendeua radendo ſempre qualche lato della ſuperficie <lb/>in teriore della carafina con figura aſlai larga, &amp; </s>
  <s xml:id="echoid-s5186" xml:space="preserve">irregola-<lb/>re. </s>
  <s xml:id="echoid-s5187" xml:space="preserve">Anzi che quando dalla parte della cin a aſcendeua ver <lb/>ſo il fondo, ò baſe (che come ſano loro Signori è largo, e <lb/>cauo con la cauità entro l’ampolletta) afceſa l’aria, non <lb/>circondaua tutto il fondo ma ſtaua, ò vnita tutta inſieme <lb/>in vna parte d eſſo, ò diuiſa in più parti.</s>
  <s xml:id="echoid-s5188" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5189" xml:space="preserve">_ofred._ </s>
  <s xml:id="echoid-s5190" xml:space="preserve">Il medemo hò oſſeruato io con vna di quelle ampolli-<lb/>nette fatte à Murano, che chia miamo da vn bezzo, riem-<lb/>pendola d’acqua con vn poco d’aria, &amp; </s>
  <s xml:id="echoid-s5191" xml:space="preserve">otturando il bucco <lb/>del ſuo collo con il dito.</s>
  <s xml:id="echoid-s5192" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5193" xml:space="preserve">_Cont._ </s>
  <s xml:id="echoid-s5194" xml:space="preserve">Che quando l’aria aſcende per illargo non formi la fi-<lb/>gura conoidale, è manifeſto quando ſi vedono ſalire per <lb/>l’acqua quelli efluuii delli quali habbiamo parlato hieri <lb/>matina ò altte bolle d’aria, che appunto ſono come tan-<lb/>te bolle di figure più ò meno curue.</s>
  <s xml:id="echoid-s5195" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5196" xml:space="preserve">_Mat._ </s>
  <s xml:id="echoid-s5197" xml:space="preserve">Di più, mi vene in penſiero d’oſſeruare ſe nelli cannelli-<lb/>nidritti, &amp; </s>
  <s xml:id="echoid-s5198" xml:space="preserve">anguſti l’aria aſcendeſſe ecome. </s>
  <s xml:id="echoid-s5199" xml:space="preserve">Si che preſi <lb/>diuerſidi queſti, le cauirà delli quali erano diuerſe, ma che <lb/>non eccedeuano la capacità d’vn grano di ſorgo, e riempi-<lb/>teli quaſi d’acqua con il ſucchiare, laſciatili però da vna <lb/>parte più, e meno quantità d’aria, eriuoltatoli, queſta non
<pb o="79" file="00173" n="173" rhead="QVINTO."/>
aſcendeuain conto alcuno ſe non foſſe ſtata pòchiſſima; <lb/></s>
  <s xml:id="echoid-s5200" xml:space="preserve">anzi che quanto più era, ſtaua più immobile.</s>
  <s xml:id="echoid-s5201" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5202" xml:space="preserve">Da queſte oſſeruationi fatte da me parmi di poter ragione-<lb/>uolmente dedurre non eſſer proprio dell’aria aſcender per <lb/>l’acqua con quella figura curua, e nel modo che dice ilP-<lb/>Riccioli, perche quando ciò foſſe ſuo proprio, aſcendereb-<lb/>be, e nel largo, e nel ſtretto. </s>
  <s xml:id="echoid-s5203" xml:space="preserve">Ma nel largo ſaliſce velociſ-<lb/>ſima con figura larga, compreſſa, ondegiante, &amp; </s>
  <s xml:id="echoid-s5204" xml:space="preserve">irregola-<lb/>re, allilati, e non ſempre per il mezzo. </s>
  <s xml:id="echoid-s5205" xml:space="preserve">Adunque non è <lb/>proprio il ſalire così, ma ſolo ſaliſce in quel modo nel tu-<lb/>bo predetto.</s>
  <s xml:id="echoid-s5206" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5207" xml:space="preserve">Di più, non così ſi figura quando aſcende in poca quantita, <lb/>perche allora forma come globetti. </s>
  <s xml:id="echoid-s5208" xml:space="preserve">In oltre non ſaliſce <lb/>così nellitubi molto ſtretti, nelli quali non ſaglie in conto <lb/>alcuno quando ſia in notabile quantità, la quale quanto <lb/>maggiore, tanto la rende più immobile. </s>
  <s xml:id="echoid-s5209" xml:space="preserve">Non mi pare a-<lb/>dunque che dal ſalire così faſtigiata nel tubo del P. </s>
  <s xml:id="echoid-s5210" xml:space="preserve">Riccio-<lb/>li ſi poſſa inferire leggierezza poſitiua mediante la quale <lb/>aſcenda primiera _natura, &amp; </s>
  <s xml:id="echoid-s5211" xml:space="preserve">cauſalitate,_ come dice egli, eſ-<lb/>ſendo cagione con il ſuo aſcendere che deſcenda l’acqua; <lb/></s>
  <s xml:id="echoid-s5212" xml:space="preserve">credendo io più toſto, ammaeſtrato da tante eſperienze, <lb/>che intanto aſcendi, perche ſia ſcacciata, &amp; </s>
  <s xml:id="echoid-s5213" xml:space="preserve">eſtruſa dall’ac-<lb/>qua, che diſcende; </s>
  <s xml:id="echoid-s5214" xml:space="preserve">di modo che quando queſta non può di-<lb/>ſcendete, come ſi è veduto nelli cannellini, non aſcenda <lb/>in conto aicuno. </s>
  <s xml:id="echoid-s5215" xml:space="preserve">Quella figura adunque faſtigiata, e co-<lb/>noidale è parto del ſalire per quel tubo, e non del ſalire <lb/>preciſamente. </s>
  <s xml:id="echoid-s5216" xml:space="preserve">Anzi che il Sig Borelli, il quale _nella prop-_ <lb/>_72._ </s>
  <s xml:id="echoid-s5217" xml:space="preserve">propone vniuerſalmente. </s>
  <s xml:id="echoid-s5218" xml:space="preserve">_Et primo ostendendum est, quod_ <lb/>_quodlibet fluidum intra aliud fluidum traslatum ſiue virtute pro-_ <lb/>_pria, ſiue aliena violentia impulſum, dummodo eius partes non_ <lb/>_diſſipentur in ipſo fluido in quo mouetur, ſed ſe mutuò conting ant,_ <lb/>_&amp; </s>
  <s xml:id="echoid-s5219" xml:space="preserve">vniantur neceſſario tumorem, &amp; </s>
  <s xml:id="echoid-s5220" xml:space="preserve">rotundam figuram acquiret_ <lb/>_in parte anteriori motus eius,_ nella proua poi di queſta faſti-<lb/>glatione ſi ſerue di diſcorſo eſemplificato, &amp; </s>
  <s xml:id="echoid-s5221" xml:space="preserve">appropriato a <lb/>queſto rubo; </s>
  <s xml:id="echoid-s5222" xml:space="preserve">dal quale ſi comprende, che non ſi faſtigia s<unsure/>t <lb/>_facilius peruadat aquam, &amp; </s>
  <s xml:id="echoid-s5223" xml:space="preserve">quaſi perforet illam ea figura,_ come <lb/>dice, e pretende il Riccioli.</s>
  <s xml:id="echoid-s5224" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5225" xml:space="preserve">_<gap/>nt._ </s>
  <s xml:id="echoid-s5226" xml:space="preserve">A propoſito dinon ſalire l’aria nelli cannelli anguſti, li
<pb o="80" file="00174" n="174" rhead="DIALOGO"/>
dirò vn’altra eſperienza fatta da me, per tentar la quale <lb/>pero n’hebbiil motiuo dal Boile _in Hiſto. </s>
  <s xml:id="echoid-s5227" xml:space="preserve">fluid. </s>
  <s xml:id="echoid-s5228" xml:space="preserve">ſect._ </s>
  <s xml:id="echoid-s5229" xml:space="preserve">4. </s>
  <s xml:id="echoid-s5230" xml:space="preserve">Preſi <lb/>vn tubo di vetro d’vn palmo in circa, elargo più d’vn dito, <lb/>aperto d’ambi le parti; </s>
  <s xml:id="echoid-s5231" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s5232" xml:space="preserve">hauendomi riempita la bocca di <lb/>fumo di tabacco, lo ſoffiai dentro ad eſſo, ſinche lo riem-<lb/>pij; </s>
  <s xml:id="echoid-s5233" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s5234" xml:space="preserve">otturatolo da vna parte con il dito, l’alzai in ſito per-<lb/>pendicolare con la parte aperta verſo l’alto, &amp; </s>
  <s xml:id="echoid-s5235" xml:space="preserve">oſſeruai <lb/>che quel fumo in tempo proportiona to diſceſe, e conſti-<lb/>tuì come vn liquore, il quale anco, inclinando il cannello, <lb/>ſcorreua per eſſo con la ſua ſuperficie terminata come ha-<lb/>uerebbe fatto l’acqua, ò altro liquore. </s>
  <s xml:id="echoid-s5236" xml:space="preserve">Ma quando s’incli-<lb/>naua tanto, che poteua vſcir dalla canna, gocciaua; </s>
  <s xml:id="echoid-s5237" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s5238" xml:space="preserve">en-<lb/>trato nell’aria libera, aſcendeua. </s>
  <s xml:id="echoid-s5239" xml:space="preserve">Hora quel ſuo ſalire per <lb/>l’aria dimoſtraua che foſſe meno graue di eſſa. </s>
  <s xml:id="echoid-s5240" xml:space="preserve">Perche non <lb/>ſaliua prima mẽtre era nella canna, mà più toſto diſceſe ſi-<lb/>no a conſtituire come vn liquido viſibile? </s>
  <s xml:id="echoid-s5241" xml:space="preserve">Io direi ciò eſſer <lb/>ſtato perche l’aria non poteua entrare, e diſcender nel can. <lb/></s>
  <s xml:id="echoid-s5242" xml:space="preserve">nello a pigliarſelo in capo, come ſaria ſtato neceſſario per <lb/>eſtruderlo. </s>
  <s xml:id="echoid-s5243" xml:space="preserve">Ma poi entrato queſto nell’ aria libera, benche <lb/>foſſe di già molto rafreddato, e condenſato, nulladimeno <lb/>eſſendo però ancora più leggiero dell’aria ambiente, que-<lb/>ſta faceua il ſuo offitio d’eſtruderlo.</s>
  <s xml:id="echoid-s5244" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5245" xml:space="preserve">_Mat_ L’hauer oſſeruato che nelli cannellini la quantità d’aria <lb/>non la laſciaua aſcendere per l’acqua, perche queſta non <lb/>poteua diſcendere ad eſtruderla, m@ſece penſare ſe anco <lb/>laſciandone quantità grande nel tubo ſecondo ſopradet-<lb/>to, il quale era aſſai più ſottile del primo, haueſſe potuto <lb/>proibire queſta diſceſa. </s>
  <s xml:id="echoid-s5246" xml:space="preserve">Ne laſciai adunque dentro vn <lb/>buon palmo; </s>
  <s xml:id="echoid-s5247" xml:space="preserve">ma però ſempre queſta aſceſe; </s>
  <s xml:id="echoid-s5248" xml:space="preserve">non però vni-<lb/>ta, ma diuiſa in più parti, e molto lentamente. </s>
  <s xml:id="echoid-s5249" xml:space="preserve">Mai però ne <lb/>ſaliua, ſe prima ſotto d’eſſa non foſſe entrata dell’acqua. <lb/></s>
  <s xml:id="echoid-s5250" xml:space="preserve">Principalmente la più baſſa mai ſaliua, ſe non vedeuo, e <lb/>ſentiuo l’acqua a colpirmi nella palma della mano con la <lb/>quale haueuo otturato il bucco inferiore, e ſopra la quale <lb/>appoggiaua l’aria. </s>
  <s xml:id="echoid-s5251" xml:space="preserve">E perche il predetto tubo terminaua <lb/>nella mazzocca, ò sferoide ſopradetto, quando l’aria ar-<lb/>riuaua nellargo, e ſaliua con grandiſſimo empito, con tan-<lb/>to empito parimente diſcendeua l’acqua, che communi-
<pb o="81" file="00175" n="175" rhead="QVINTO."/>
cando queſto ſuo empito all’altra, che già diſceſa haueua <lb/>in buona parte riempito il@tubo, faceua vn ſpingere la ma-<lb/>no molto conſiderabile, e ſenſibile.</s>
  <s xml:id="echoid-s5252" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5253" xml:space="preserve">Invece poi de riuoltar la canna con celerità, &amp; </s>
  <s xml:id="echoid-s5254" xml:space="preserve">ergerla per-<lb/>pendicolare, come haueuo fatto nell’ antidette eſpe-<lb/>rienze, l’inclinai pian piano ſino al ſito orizontale; </s>
  <s xml:id="echoid-s5255" xml:space="preserve">nel <lb/>quale non aſcendeua l’aria, ma occupaua tutto quel ſpa-<lb/>tio, che occupaua prima; </s>
  <s xml:id="echoid-s5256" xml:space="preserve">ſecondo poi che s’inclinaua ſotto <lb/>l’orizonte, l’acqua ſubintraua per qualche poco all’aria, la <lb/>quale vnitalperò all’ altra principiaua ſalire radendo il la-<lb/>to ſuperiore del tubo; </s>
  <s xml:id="echoid-s5257" xml:space="preserve">ne mai ſi ſtaccaua dal fondo, ſe pri-<lb/>ma l’acqua non era diſceſa a ſcacciarla.</s>
  <s xml:id="echoid-s5258" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5259" xml:space="preserve">_Ofr._ </s>
  <s xml:id="echoid-s5260" xml:space="preserve">Ha V. </s>
  <s xml:id="echoid-s5261" xml:space="preserve">S. </s>
  <s xml:id="echoid-s5262" xml:space="preserve">tentato altre eſperienze?</s>
  <s xml:id="echoid-s5263" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5264" xml:space="preserve">_Mat._ </s>
  <s xml:id="echoid-s5265" xml:space="preserve">Nel medemo tubo laſciai poca aria, e l’inclinai nel me-<lb/>demo modo. </s>
  <s xml:id="echoid-s5266" xml:space="preserve">L’aria ſaliua pure radendo il lato, e formaua <lb/>vna figura curua ſotto, e ſopra con curuità coſi notabile, <lb/>che pareua quaſi vn’elliſſe, ò vogliamo dire figura ouale.</s>
  <s xml:id="echoid-s5267" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5268" xml:space="preserve">Nelli predetti tubi in vece d’aria hò poſto vn poco d’olio, il <lb/>quale alle volte non ſaliua in conto alcuno ſe non agitato <lb/>molto il tubo; </s>
  <s xml:id="echoid-s5269" xml:space="preserve">perche eſſendo queſto aſſai viſcoſo non la-<lb/>ſciaua coſi prontamente diſcender l’acqua a ſcacciarlo. <lb/></s>
  <s xml:id="echoid-s5270" xml:space="preserve">Mai però mi è riuſcito vederlo aſcender tutto vnito, ma <lb/>ſempre diuiſo in più parti ſucceſſiua vna all’altra, anco con <lb/>interſtitij molto notabili. </s>
  <s xml:id="echoid-s5271" xml:space="preserve">Ben ſpeſſo vna di queſte era a ſſai <lb/>maggiore delle altre. </s>
  <s xml:id="echoid-s5272" xml:space="preserve">Queſte poi erano conueſſe tanto dal-<lb/>la parte ſuperiore, quanto dall’inferiore; </s>
  <s xml:id="echoid-s5273" xml:space="preserve">ma molte più dal-<lb/>la ſuperiore, che dall’inferiore; </s>
  <s xml:id="echoid-s5274" xml:space="preserve">altre più da queſta, che da <lb/>quella. </s>
  <s xml:id="echoid-s5275" xml:space="preserve">Alcune formauano come vna lente; </s>
  <s xml:id="echoid-s5276" xml:space="preserve">altre s’acco-<lb/>ſtauano più alla sfera, ò sferoide. </s>
  <s xml:id="echoid-s5277" xml:space="preserve">Alcune aſcendeuano, &amp; </s>
  <s xml:id="echoid-s5278" xml:space="preserve"><lb/>inſieme girauano circa il proprio centro verticalmente. </s>
  <s xml:id="echoid-s5279" xml:space="preserve"><lb/>Altre conteneuano nella parte inferiore, nella quale haue-<lb/>uano vna gran curuità, quantità di perlette lucide, che era-<lb/>no acqua, come habbiamo detto nel _Dial 5. </s>
  <s xml:id="echoid-s5280" xml:space="preserve">pagina 53._ </s>
  <s xml:id="echoid-s5281" xml:space="preserve">Altre <lb/>haueuano vnito al di ſopra vna, ò più perlette, che erano <lb/>certo aria. </s>
  <s xml:id="echoid-s5282" xml:space="preserve">Tutte queſte aſcendeuano per il tubo ſtretto, &amp; </s>
  <s xml:id="echoid-s5283" xml:space="preserve"><lb/>vguale con vn tal moto, il quale ſi velocitaua di gran lunga <lb/>quando arriuauano al largo di quella mazzocca, &amp; </s>
  <s xml:id="echoid-s5284" xml:space="preserve">allora <lb/>molto diuerſificauano la figura, facendola aſſai più larga,
<pb o="82" file="00176" n="176" rhead="_DIALOGO_"/>
ſchizziata, &amp; </s>
  <s xml:id="echoid-s5285" xml:space="preserve">irregolare.</s>
  <s xml:id="echoid-s5286" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5287" xml:space="preserve">_Cont._ </s>
  <s xml:id="echoid-s5288" xml:space="preserve">Mi marauiglio molto di queſte eſperienze; </s>
  <s xml:id="echoid-s5289" xml:space="preserve">le quali mē-<lb/>tre V. </s>
  <s xml:id="echoid-s5290" xml:space="preserve">S. </s>
  <s xml:id="echoid-s5291" xml:space="preserve">èandato narrando, io hò letto li titoli d’alcune <lb/>propoſitioni del Sig. </s>
  <s xml:id="echoid-s5292" xml:space="preserve">Borelli. </s>
  <s xml:id="echoid-s5293" xml:space="preserve">Nella 73. </s>
  <s xml:id="echoid-s5294" xml:space="preserve">dice. </s>
  <s xml:id="echoid-s5295" xml:space="preserve">_Poſito quod flui_-<lb/>_dum violenter ſurſum exprimatur a fluido ambiente grauiori, di_-<lb/>_uerſœque conſiſtentiœ, infima aſcendentis ſuperficies explanata,_ <lb/>_vel concaua erit._</s>
  <s xml:id="echoid-s5296" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5297" xml:space="preserve">_Mat._ </s>
  <s xml:id="echoid-s5298" xml:space="preserve">Io mai l’ho veduta ne nell’aria, ne nell’olio concaua; </s>
  <s xml:id="echoid-s5299" xml:space="preserve">be-<lb/>ne nell’aria, nelli cilindri d’eſſa molto notabili mi ha parſo <lb/>piana, di modo però che più toſto appariua qualche con-<lb/>ueſſità, che cauità. </s>
  <s xml:id="echoid-s5300" xml:space="preserve">La qual conueſſità era molto oſſerua-<lb/>bile nelli globetti d’eſſa, e la conſeruaua anco in alcuni at-<lb/>taccati alla baſe della maggiore, come già hò detto, ben-<lb/>che aſcendeſſero con eſſa. </s>
  <s xml:id="echoid-s5301" xml:space="preserve">Queſta conueſſità pordalla par-<lb/>teinferiore era molto notabile, come pure hò detto, in <lb/>quell’aria, che in quantità non così poca aſcendeua raden-<lb/>do il lato del tubo non perpendicolare, ma ſolo inclinato <lb/>all’orizonte. </s>
  <s xml:id="echoid-s5302" xml:space="preserve">Nell’olio poi queſta conueſſità dalla parte in-<lb/>feriore è frequentiſſima.</s>
  <s xml:id="echoid-s5303" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5304" xml:space="preserve">_Cont._ </s>
  <s xml:id="echoid-s5305" xml:space="preserve">Se cosìè, haurà, in virtù delle propoſitioni di queſto Si-<lb/>gnore, ragione il P. </s>
  <s xml:id="echoid-s5306" xml:space="preserve">Riccioli di credere, che I’olio in par-<lb/>ticolare aſcendi per leggierezza poſitiua, ſoggiungendo <lb/>pur egli _la prop. </s>
  <s xml:id="echoid-s5307" xml:space="preserve">74. </s>
  <s xml:id="echoid-s5308" xml:space="preserve">Si fluidum ſpontè à virtute intrinſeca intra_ <lb/>_aliud fluidum diuerſœ conſiſtentiœ moueatur in parte poſteriori, ſeu_ <lb/>_termino à quo, ſui motus, non erit excauatum ſed tumidam; </s>
  <s xml:id="echoid-s5309" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s5310" xml:space="preserve">con_-<lb/>_uexam figuram acquiret._</s>
  <s xml:id="echoid-s5311" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5312" xml:space="preserve">_Mat._ </s>
  <s xml:id="echoid-s5313" xml:space="preserve">Coſa poſſi inferire il P. </s>
  <s xml:id="echoid-s5314" xml:space="preserve">Riccioli dalle propoſitioni del <lb/>Signor Borelli io non lo voglio ricercare. </s>
  <s xml:id="echoid-s5315" xml:space="preserve">Sò bene che io <lb/>hò fatto quelle eſperienze, e che non per queſto tengo che <lb/>l’olio, &amp; </s>
  <s xml:id="echoid-s5316" xml:space="preserve">aria aſcendino per l’acqua per leggerezza poſiti-<lb/>ua, ma ſolo per eſtruſione.</s>
  <s xml:id="echoid-s5317" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5318" xml:space="preserve">_Ofr._ </s>
  <s xml:id="echoid-s5319" xml:space="preserve">In gratia V. </s>
  <s xml:id="echoid-s5320" xml:space="preserve">Sig. </s>
  <s xml:id="echoid-s5321" xml:space="preserve">habb vn poco di patienza, che io con <lb/>queſta carafa cilindrica voglio fare queſt eſperienze in <lb/>qualche modo. </s>
  <s xml:id="echoid-s5322" xml:space="preserve">Ecco che riempitela d’acqua, &amp; </s>
  <s xml:id="echoid-s5323" xml:space="preserve">otturan-<lb/>dola con il pollice, ralentando vn poco l’otturamento ſi <lb/>vedono aſcēdere velociſſimamēte alcune palline, ò sferet-<lb/>te d’aria. </s>
  <s xml:id="echoid-s5324" xml:space="preserve">Anzi che alcune di queſte aſcene ſino al fondo del-<lb/>la carafa conſeruano la cu@uità viſibile nella parte inferio-
<pb o="83" file="00177" n="177" rhead="_QVINRO._"/>
re. </s>
  <s xml:id="echoid-s5325" xml:space="preserve">V S. </s>
  <s xml:id="echoid-s5326" xml:space="preserve">milaſci infondere vn poco d’olio. </s>
  <s xml:id="echoid-s5327" xml:space="preserve">Ecco che que-<lb/>ſto ſaliſce in diuerſe goccie formando diuerſe figure. </s>
  <s xml:id="echoid-s5328" xml:space="preserve">Ve-<lb/>dono loro Signori quella gocciola, che aſcende aſſai len-<lb/>tamente, la quale par quaſi vna sfera perfetta? </s>
  <s xml:id="echoid-s5329" xml:space="preserve">Vedono <lb/>quell’altra, che ha maggior conueſſità nella parte inferio-<lb/>re, che nella ſuperiore? </s>
  <s xml:id="echoid-s5330" xml:space="preserve">Con quella facilità, che noi hab-<lb/>biamo oſſeruato queſti Fenomeni, con la medema potran-<lb/>no oſſeruarſi da chi ſi ſia.</s>
  <s xml:id="echoid-s5331" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5332" xml:space="preserve">_Mat._ </s>
  <s xml:id="echoid-s5333" xml:space="preserve">Non vi ha dubio. </s>
  <s xml:id="echoid-s5334" xml:space="preserve">Ceſſi adunque Sig Ofredi in lei il ſtupo-<lb/>re, che nel tubo, ecaſo del P. </s>
  <s xml:id="echoid-s5335" xml:space="preserve">Riccioli l’aria aſcenda piǹ <lb/>lentamente che I’olio, perche queſto naſce dalla quanti-<lb/>tà notabile dell’aria, e dalla qualità del tubo del P. </s>
  <s xml:id="echoid-s5336" xml:space="preserve">Riccio-<lb/>li. </s>
  <s xml:id="echoid-s5337" xml:space="preserve">Non riuoltiamo il tubo, e conſtituimo in ſito perpendi-<lb/>colare all’orizonte che prima non ſe li facia parallelo, e <lb/>poi s’inclini, e che in queſto moto l’acqua non diſcenda <lb/>ſotto l’aria nel modo, che molto euidentemente dichiara <lb/>il Sig. </s>
  <s xml:id="echoid-s5338" xml:space="preserve">Borelli _prop._ </s>
  <s xml:id="echoid-s5339" xml:space="preserve">78. </s>
  <s xml:id="echoid-s5340" xml:space="preserve">Onde l’acqua ſe piglia in capo l’aria, e <lb/>principia ad eſtruderla; </s>
  <s xml:id="echoid-s5341" xml:space="preserve">ma queſta eſſendo in notabile <lb/>quantità, perciò laſciando anguſto cale all’ acqua per di-<lb/>ſcendere, non può queſta ottener il ſuo intento che lenta-<lb/>mente; </s>
  <s xml:id="echoid-s5342" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s5343" xml:space="preserve">in conſeguenza lentamente ſpinger insù I aria-<lb/>li che poi diuerſamente ſuccede quando l’acqua ha campo <lb/>di diſcendere a ſuo talento; </s>
  <s xml:id="echoid-s5344" xml:space="preserve">perche in queſto caſo ſpinge <lb/>insù l’aria con tanto impeto che a pena l’occhio può ſe-<lb/>guire queſto moto. </s>
  <s xml:id="echoid-s5345" xml:space="preserve">Ma quando ſi poteſſe riuoltaril tubo <lb/>ſenza che l’acqua poteſſe principiar a diſcendere come in <lb/>fatti ſuccede nelli cannellini, eſpeſſe volte nelli più grandi <lb/>quando ſe vi pone dell’olio, allora l’aria, &amp; </s>
  <s xml:id="echoid-s5346" xml:space="preserve">olio non aſcen-<lb/>dono in conto alcuno, perche l’acqua non può ſubintra-<lb/>re a ſcacciarli.</s>
  <s xml:id="echoid-s5347" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5348" xml:space="preserve">Quanto poi alla curuità, che nota il P. </s>
  <s xml:id="echoid-s5349" xml:space="preserve">Riccioli formarſi nel-<lb/>la parte anteriore, oltre a quanto habbiamo detto, s’oſſer-<lb/>ui anco la dottrina regiſtrata pure del Signor Borelli _prop._ <lb/></s>
  <s xml:id="echoid-s5350" xml:space="preserve">72. </s>
  <s xml:id="echoid-s5351" xml:space="preserve">cioè, _Quodlibet fluidũ homogeneum naturali inſtintu videtur_ <lb/>_ſpontè coaleſcere, ac ſimul in ſuo toto partes ſuas conglutinare_-<lb/>Che perciò per maggiormẽte vnirſi affetta la figura sferi-<lb/>ca quanto puole. </s>
  <s xml:id="echoid-s5352" xml:space="preserve">Così vediamo che le parti dell acqua ſe-<lb/>parate dall’altre ſi formano in goccie; </s>
  <s xml:id="echoid-s5353" xml:space="preserve">e didue, ò più ap-
<pb o="84" file="00178" n="178" rhead="_DIALOGO_"/>
proſſimandoſi vna all’altra ſi che ſi tocchino, ſe ne fà vna <lb/>ſola. </s>
  <s xml:id="echoid-s5354" xml:space="preserve">Et è tanta la propenſione al conglobarſi (prouenga <lb/>queſta da qual ſi ſia cauſa) che ſe qualche goccia d’acqua <lb/>penda da qualche luogo, e ſe diſtratta da forza non valeuo-<lb/>le à ſuperare la ſua continuità, queſta s’allunga, eſottiglia; <lb/></s>
  <s xml:id="echoid-s5355" xml:space="preserve">e ceſſata la forza diſtraibile, ritorna à conglobarſi come <lb/>prima.</s>
  <s xml:id="echoid-s5356" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5357" xml:space="preserve">_Cont._ </s>
  <s xml:id="echoid-s5358" xml:space="preserve">Quanta propenſione habbino liliquidi à conſeruarſi v-<lb/>niti, e conglobati lo dimoſtra il conſeruarſi, e formarſita-<lb/>li anco nel vacuo, ò quaſi vacuo. </s>
  <s xml:id="echoid-s5359" xml:space="preserve">Al qual propoſito vedaſi <lb/>l’eſperienza regiſtrata dalli Accademici Fiorentini _nelli_ <lb/>_ſaggi, &amp;</s>
  <s xml:id="echoid-s5360" xml:space="preserve">c. </s>
  <s xml:id="echoid-s5361" xml:space="preserve">pag. </s>
  <s xml:id="echoid-s5362" xml:space="preserve">78._</s>
  <s xml:id="echoid-s5363" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5364" xml:space="preserve">_Mat._ </s>
  <s xml:id="echoid-s5365" xml:space="preserve">Queſta propẽſione ritiene anco l’aria nell’acqua, che per <lb/>ciò affetta il conglobarſi quanto puole, e doue puole. </s>
  <s xml:id="echoid-s5366" xml:space="preserve">Nel <lb/>tubo del P. </s>
  <s xml:id="echoid-s5367" xml:space="preserve">Riccioli lo dimoſtra nella partc ſuperiore doue <lb/>può formarla, non dalli lati impedita dalla ſtrettezza del <lb/>tubo, e dalla propria quantità. </s>
  <s xml:id="echoid-s5368" xml:space="preserve">Non la forma cosìpronta <lb/>mente nella parte inferiore, perche le ſpinte continue del-<lb/>l’acqua, che iuiriceue, non lo permettono. </s>
  <s xml:id="echoid-s5369" xml:space="preserve">L’affetta però <lb/>quanto puole, apparendone qualche veſtigio, &amp; </s>
  <s xml:id="echoid-s5370" xml:space="preserve">euiden-<lb/>tiſſimamente nella poca quantità; </s>
  <s xml:id="echoid-s5371" xml:space="preserve">&amp; </s>
  <s xml:id="echoid-s5372" xml:space="preserve">in quella, che aſcen-<lb/>de radendo il lato del tubo inclinato, come ſopra habbia-<lb/>mo detto.</s>
  <s xml:id="echoid-s5373" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5374" xml:space="preserve">_Ofr._ </s>
  <s xml:id="echoid-s5375" xml:space="preserve">Adunque l’acqua non potrà mai eſtruder vn galleggian-<lb/>te, ò per meglio dire queſto non aſcenderà in eſſa, ſe non <lb/>li potrà entrar ſotto?</s>
  <s xml:id="echoid-s5376" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5377" xml:space="preserve">_Mat._</s>
  <s xml:id="echoid-s5378" xml:space="preserve">Non Signore.</s>
  <s xml:id="echoid-s5379" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5380" xml:space="preserve">_Cont._ </s>
  <s xml:id="echoid-s5381" xml:space="preserve">Con l’acqua non è così facile far eſperienze di queſto <lb/>per la ſua ſomma fluſſibilità, mediante la quale pronta-<lb/>mente penetra tra corpo, e corpo, che ſi combacino, ma <lb/>bene con il mercurio ſi può vedere ciò molto manifeſta-<lb/>mente, eſſendo meno fluido. </s>
  <s xml:id="echoid-s5382" xml:space="preserve">Il dottiſſimo Signor Toma-<lb/>ſo Cornelio Coſentino gran filoſofo, e mio antico amico <lb/>_Nelli ſuoi Progimn. </s>
  <s xml:id="echoid-s5383" xml:space="preserve">fiſ. </s>
  <s xml:id="echoid-s5384" xml:space="preserve">de circump. </s>
  <s xml:id="echoid-s5385" xml:space="preserve">Platon. </s>
  <s xml:id="echoid-s5386" xml:space="preserve">pag._ </s>
  <s xml:id="echoid-s5387" xml:space="preserve">124. </s>
  <s xml:id="echoid-s5388" xml:space="preserve">narra vna <lb/>bella eſperienza in ſimil propoſito. </s>
  <s xml:id="echoid-s5389" xml:space="preserve">Dice che ſopra il fondo <lb/>ottimamente ſpianato d’vn vaſo ponendoſi vn circoletto <lb/>dicartone, ò legno, che lo baci eſquiſitamente, al qual <lb/>circoletto dal centro ſia attaccato vn ſpaghetto cō il qua-
<pb o="85" file="00179" n="179" rhead="_QVINTO._"/>
le ſi poſſi alzare perpendicolarmente, &amp; </s>
  <s xml:id="echoid-s5390" xml:space="preserve">infondendo nel <lb/>vaſo del mercurio, il circoletto non aſcenderà in conto <lb/>alcuno benche tanto più leggiero del mercurio. </s>
  <s xml:id="echoid-s5391" xml:space="preserve">Anzi che <lb/>chi procurerà alzarlo, tirandolo con quel ſpaghetto; </s>
  <s xml:id="echoid-s5392" xml:space="preserve">ciò <lb/>non potrà fare che adoperando forza, che poſſi ſuperare il <lb/>peſo di quel mercurio, che ſopraſta al circoletto. </s>
  <s xml:id="echoid-s5393" xml:space="preserve">Ma ſe poi <lb/>s’alzerà qualche poco, di modo che il mercurio poſſi prin-<lb/>cipiare ad inſinuarſi ſotto d’eſſo; </s>
  <s xml:id="echoid-s5394" xml:space="preserve">ſubito ſarà ſpinto insù <lb/>con moto velociſſimo.</s>
  <s xml:id="echoid-s5395" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5396" xml:space="preserve">_Ofre._ </s>
  <s xml:id="echoid-s5397" xml:space="preserve">Queſta eſperienza non mi cagiona punto di merauiglia, <lb/>ne punto miperſuade; </s>
  <s xml:id="echoid-s5398" xml:space="preserve">correndo quà la medema ragione, <lb/>che corre nell’eſempio tritiſſimo delle due laſtre ottima-<lb/>mente ſpianate, e congionte, che alzandone vna petpen-<lb/>dicolarmente, ſegue l’altra il ſuo moto, ne ſi ſeparano _ne_ <lb/>_detur vacuum_ tanto abborrito dalla natura. </s>
  <s xml:id="echoid-s5399" xml:space="preserve">Non aſcende il <lb/>circoletto, non potendoſi ſeparare dal fondo del vaſo ac-<lb/>ciò non ſi dia il vacuo, che neceſſariamente biſogneria che <lb/>ſi daſſe per quel tempo, che ſaria neceſſario al moto del <lb/>mercurio à riempire il ſpatio contenuto trà il circoletto, <lb/>&amp; </s>
  <s xml:id="echoid-s5400" xml:space="preserve">il fondo del vaſo.</s>
  <s xml:id="echoid-s5401" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5402" xml:space="preserve">_Mat._ </s>
  <s xml:id="echoid-s5403" xml:space="preserve">Anco lei Sig. </s>
  <s xml:id="echoid-s5404" xml:space="preserve">Ofredi è trà li fautori di queſto vacuo, al <lb/>quale forſe la natura non ha vn abborrimento immagina-<lb/>bile? </s>
  <s xml:id="echoid-s5405" xml:space="preserve">Perche ſarà ſtaccato il circoletto, ſenza che rouini il <lb/>mondo, da chi ſarà alzato con forza, che ſupcri il peſo del <lb/>mercurio, che li ſouraſta. </s>
  <s xml:id="echoid-s5406" xml:space="preserve">Horsù il Sig. </s>
  <s xml:id="echoid-s5407" xml:space="preserve">Borelli _nella prop._ <lb/></s>
  <s xml:id="echoid-s5408" xml:space="preserve">82. </s>
  <s xml:id="echoid-s5409" xml:space="preserve">li leua queſto ſutterfugio con vna caſtigata eſperien-<lb/>za, che dice d’hauer fatto nell’Accademia Fiorentina. </s>
  <s xml:id="echoid-s5410" xml:space="preserve">Nel <lb/>vaſo ABCD, che há il concauo <lb/>AEFD, &amp; </s>
  <s xml:id="echoid-s5411" xml:space="preserve">il forame E F, poſe la <lb/>
<anchor type="figure" xlink:label="fig-00179-01a" xlink:href="fig-00179-01"/>
palla di legno G, che bene l’ottur <lb/>raſſe, ma poteſſe girarſeli intor-<lb/>no; </s>
  <s xml:id="echoid-s5412" xml:space="preserve">edi ſotto li fece il forame <lb/>HEF, poi riempì il vaſo di mer-<lb/>curio ſin’all’ AD. </s>
  <s xml:id="echoid-s5413" xml:space="preserve">In queſto caſo <lb/>aſcendendo la palla non vi era <lb/>pericolo di vacuo, potendo ſuc-<lb/>ceder l’aria, e pure non aſceſe in <lb/>conto alcuno, perche il mercu-
<pb o="86" file="00180" n="180" rhead="_DIALOGO_"/>
rio non poteua diſcender ad eſtruderla.</s>
  <s xml:id="echoid-s5414" xml:space="preserve"/>
</p>
<div xml:id="echoid-div40" type="float" level="2" n="1">
  <figure xlink:label="fig-00179-01" xlink:href="fig-00179-01a">
    <image file="00179-01" xlink:href="http://echo.mpiwg-berlin.mpg.de/zogilib?fn=/permanent/library/9EXVCG1R/figures/00179-01"/>
  </figure>
</div>
<p>
  <s xml:id="echoid-s5415" xml:space="preserve">_Mat._ </s>
  <s xml:id="echoid-s5416" xml:space="preserve">In gratia miei Signori mi aſpetino vn poco che horho <lb/>ra ritorno. </s>
  <s xml:id="echoid-s5417" xml:space="preserve">Eccomi à riſeruirle.</s>
  <s xml:id="echoid-s5418" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5419" xml:space="preserve">_Ofr._ </s>
  <s xml:id="echoid-s5420" xml:space="preserve">Coſa vuol fare di queſta boccia piena d’acqua?</s>
  <s xml:id="echoid-s5421" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5422" xml:space="preserve">_Mat._ </s>
  <s xml:id="echoid-s5423" xml:space="preserve">Come vede Signor Ofredi queſta boccia da canneuetta <lb/>piena d’acqua (poco importarebbe che foſſe altro vaſo) <lb/>è otturata con queſto ſughero, che non la ſerra eſquiſita-<lb/>mẽte, di modo che hora che è riuoltata conil bucco all’in-<lb/>giù, ſtilla all’intorno del ſughero l’acqua; </s>
  <s xml:id="echoid-s5424" xml:space="preserve">e pure queſto <lb/>non aſcende in conto alcuno. </s>
  <s xml:id="echoid-s5425" xml:space="preserve">Sà V. </s>
  <s xml:id="echoid-s5426" xml:space="preserve">S. </s>
  <s xml:id="echoid-s5427" xml:space="preserve">la cauſa di ciò? </s>
  <s xml:id="echoid-s5428" xml:space="preserve">Que-<lb/>ſta è perche l’acqua, che diſcende non ſubintra, e ſi piglia <lb/>in capo il ſughero.</s>
  <s xml:id="echoid-s5429" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5430" xml:space="preserve">Di più ecco che con queſto temperarino ſpingo lo ſughero <lb/>all’insù vn poco, poco, sì che aggiuto la ſua leggierezza <lb/>(ſe ve ne hà) all’aſcendere; </s>
  <s xml:id="echoid-s5431" xml:space="preserve">e pure _tantum abeſt_ che aſcendi, <lb/>che V. </s>
  <s xml:id="echoid-s5432" xml:space="preserve">S. </s>
  <s xml:id="echoid-s5433" xml:space="preserve">lo vede a ritornare ad otturar la boccia come <lb/>prima. </s>
  <s xml:id="echoid-s5434" xml:space="preserve">Ciò certò d’altronde non procede ſe non perche <lb/>non è eſtruſo, non potendoli ſubintrar l’acqua, e rifletten-<lb/>do cacciarlo all’insù.</s>
  <s xml:id="echoid-s5435" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5436" xml:space="preserve">_Cont._ </s>
  <s xml:id="echoid-s5437" xml:space="preserve">Già che il Sig. </s>
  <s xml:id="echoid-s5438" xml:space="preserve">Ofredi hà diſopra portato l’eſempio delle <lb/>due laſtre, le quali hà creduto non ſepararſi _ne detur va-_ <lb/>_cuum,_ giudico bene che ſi fermiamo vn poco circa queſto <lb/>Fenomeno, intendendo di proponer alli curioſi alcune eſ-<lb/>perienze, che deſidererai che foſſero fatte de quelli che <lb/>hannole machine a propolito. </s>
  <s xml:id="echoid-s5439" xml:space="preserve">Si pigliano due laſtre di ve-<lb/>tro, pietra, ò metallo, le quali ſiano ottimamente ſpianate, <lb/>sì che ponendone vna ſopral altra ſi combaccino total-<lb/>mente ſenza che di mezzo vi ſia aria, (anzi che per eſclu-<lb/>derla meglio ſi bagnano con acqua, acquauita, olio di mã-<lb/>dole dolci, &amp;</s>
  <s xml:id="echoid-s5440" xml:space="preserve">c. </s>
  <s xml:id="echoid-s5441" xml:space="preserve">accioche queſti riempiano tutte quelle mi-<lb/>nime cauità, che perfortuna vi foſſero) e ſe appendono <lb/>parallele all’orizonte. </s>
  <s xml:id="echoid-s5442" xml:space="preserve">Queſte ſtanno così appeſe, ne l’infe-<lb/>riore ſi ſtacca dalla ſuperiore, benche non li ſia attaccata <lb/>che dal ſolo contatto. </s>
  <s xml:id="echoid-s5443" xml:space="preserve">L’vniuerſal opinione delle ſcuole è <lb/>ſtata comunemente, e pur hora regna trà molti, che ciò <lb/>ſucceda _ne detur vacuum_; </s>
  <s xml:id="echoid-s5444" xml:space="preserve">ma hora da chi ha giuditio, e filo-<lb/>ſofa con l’eſperienze, ſi dice ciò ſuccedere per la preſſione <lb/>dell’aria, che preme, &amp; </s>
  <s xml:id="echoid-s5445" xml:space="preserve">ſpinge l’inferiore alla ſuperiore, la
<pb o="87" file="00181" n="181" rhead="QVINTO."/>
qual preſſione non può eſſer ſuperata che da ſorza ad eſſa <lb/>vguale. </s>
  <s xml:id="echoid-s5446" xml:space="preserve">La proua efficaciſſima di queſto è, che ſe ciò ſuc-<lb/>cedeſſe per l’abborrimento della natura al vacuo, non po-<lb/>trebbero queſte laſtre eſſer ſeparate da forza alcuna; </s>
  <s xml:id="echoid-s5447" xml:space="preserve">anzi <lb/>che prima di ſeparaſi, ſi ſpezzarebbero; </s>
  <s xml:id="echoid-s5448" xml:space="preserve">ma queſto non. <lb/></s>
  <s xml:id="echoid-s5449" xml:space="preserve">ſuccede; </s>
  <s xml:id="echoid-s5450" xml:space="preserve">perche non ogni laſtra reſta attaccata alla ſupe-<lb/>riore, ma di vn peſo limitato, che non ſuperi quello d vn, <lb/>priſma di mercurio di baſe vguale alla laſtra, &amp; </s>
  <s xml:id="echoid-s5451" xml:space="preserve">alto vn <lb/>braccio, &amp; </s>
  <s xml:id="echoid-s5452" xml:space="preserve">vn quarto Fiorentino in circa, ò diti 29. </s>
  <s xml:id="echoid-s5453" xml:space="preserve">della, <lb/>miſura di Scotia. </s>
  <s xml:id="echoid-s5454" xml:space="preserve">Per eſempio ſiano le laſtre due circoli <lb/>d’vn palmo di diametro; </s>
  <s xml:id="echoid-s5455" xml:space="preserve">quando l’inferiore peſi meno di <lb/>quello che peſi vn cilindro di mercurio alto vn braccio, &amp; </s>
  <s xml:id="echoid-s5456" xml:space="preserve"><lb/>vn quarto, e di baſe d’vn palmo di diametro, reſterà attac <lb/>cata: </s>
  <s xml:id="echoid-s5457" xml:space="preserve">ſe peſerà più, ò ſarà tirata con forza che ſuperi queſto <lb/>peſo, ſarà ſeparata con grandiſsima facilità. </s>
  <s xml:id="echoid-s5458" xml:space="preserve">La ragione è <lb/>perche la forza dell’aria, che la preme, e ſpinge verſo la ſu-<lb/>periore, è vguale à queſto peſo, equilibrando queſto mer-<lb/>curio nel tubo torricelliano, ò Baroſcopio, come hab-<lb/>biamo detto tante volte.</s>
  <s xml:id="echoid-s5459" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5460" xml:space="preserve">Si potranno adunque fare le ſeguenti eſperienze. </s>
  <s xml:id="echoid-s5461" xml:space="preserve">La laſtra, <lb/>inferiore habbia attaccato qualche recettacolo d’aggiun-<lb/>ger peſo, e queſto s’aggiũga ſino che cõ il peſo della laſtra <lb/>ſia vguale al predetto peſo del mercurio; </s>
  <s xml:id="echoid-s5462" xml:space="preserve">il che otteneraſſi <lb/>con qualche diligenza, leuando, &amp; </s>
  <s xml:id="echoid-s5463" xml:space="preserve">aggiumgendo, perche, <lb/>ogni poco di più che s’aggiunga farà cader la la ſtra. </s>
  <s xml:id="echoid-s5464" xml:space="preserve">Nota-<lb/>to tutto queſto peſo, con le laſtre s’aſcendi ſopra qualche <lb/>monte, e ſi torni a fare l’eſperienza. </s>
  <s xml:id="echoid-s5465" xml:space="preserve">Se il peſo aggiunto <lb/>con quello della laſtra ſarà, tanto minore del peſo predetto <lb/>ritrouato nel piano ſecondo quella proportione con Ia, <lb/>quale il mercurio nel Baroſcopio ſaglie meno al monte, <lb/>che al piano, perche non doueremo dire che queſto Feno-<lb/>meno ſia vn effetto della preſſione dell’aria?</s>
  <s xml:id="echoid-s5466" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5467" xml:space="preserve">_Ofr_. </s>
  <s xml:id="echoid-s5468" xml:space="preserve">Tanto che nel vacuo, ò doue l’aria foſſe di forza deboliſ-<lb/>ſima, ò poco, ò nulla ſtarebbero attaccate le laſtre.</s>
  <s xml:id="echoid-s5469" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5470" xml:space="preserve">_Cont_. </s>
  <s xml:id="echoid-s5471" xml:space="preserve">Io lo tengo di certo. </s>
  <s xml:id="echoid-s5472" xml:space="preserve">Che perciò deſidero, che due di <lb/>queſte laſtre s’aggiuſtino, ò nella machina del Boile, o in <lb/>vna di quelle machine, con le quali li Accademici Fioren <lb/>tini hanno procurato il voto (riempendole di mercurio)
<pb o="88" file="00182" n="182" rhead="DIALOGO"/>
capaci d’animali, veſciche, e coſe ſimili, che hanno ado-<lb/>prato per fare tante nobili eſperienze. </s>
  <s xml:id="echoid-s5473" xml:space="preserve">Poiche io tengo di <lb/>certo che fatto il voto, ò debilitato l’elatere dell’ aria con <lb/>l’euacuatione, che quelle laſtre ſi ſepareriano. </s>
  <s xml:id="echoid-s5474" xml:space="preserve">Chi faceſſe <lb/>poi l’eſperienze, potrebbe aggiuſtar le laſtre in modo, che <lb/>I’inferiore cadendo non portaſſe nocumento al vaſo, e ciò <lb/>come meglio li parerà.</s>
  <s xml:id="echoid-s5475" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5476" xml:space="preserve">Di più vorrei che la laſtra ſuperiore attaccata ad vn ſpago ſi <lb/>profondaſſe molto ſott acqua pur parallela all’orizonte, e <lb/>che qualche nuotatore li attaccaſſe l’altra aggrauata co-<lb/>me ſopra l’acqua. </s>
  <s xml:id="echoid-s5477" xml:space="preserve">Perche certo eſperimentarebbe che a ſe-<lb/>pararla queſto peſo, ò forza non baſterebbe, ma de più vi <lb/>vorrebbe tanto che corriſpondeſſe alla preſſione anco, che <lb/>fà l’acqua; </s>
  <s xml:id="echoid-s5478" xml:space="preserve">cioè che vguagliaſſe il peſo d’vn cilindro di <lb/>mercurio di diametro delle laſtre, e d’altezza, che foſſe vn <lb/>quartodecimo dell’altezza dell’acqua, che ſouraſta alle la-<lb/>ſtre, &amp; </s>
  <s xml:id="echoid-s5479" xml:space="preserve">vn braccio, &amp; </s>
  <s xml:id="echoid-s5480" xml:space="preserve">vn quarto. </s>
  <s xml:id="echoid-s5481" xml:space="preserve">Ma Sig. </s>
  <s xml:id="echoid-s5482" xml:space="preserve">Ofredi che coſa <lb/>hà, che non fà altro che ridere?</s>
  <s xml:id="echoid-s5483" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5484" xml:space="preserve">_Ofr_. </s>
  <s xml:id="echoid-s5485" xml:space="preserve">Non vuole V. </s>
  <s xml:id="echoid-s5486" xml:space="preserve">Sig. </s>
  <s xml:id="echoid-s5487" xml:space="preserve">che io rida nell’vdir proponere il fare, <lb/>tanti caſtelli in aria? </s>
  <s xml:id="echoid-s5488" xml:space="preserve">L’è vna facil coſa il dire ſi facia que-<lb/>ſta, e queſt’altra eſperienza. </s>
  <s xml:id="echoid-s5489" xml:space="preserve">Il punto ſtà nell’eſperimenta, <lb/>re, poiche s’incontrano tante difficoltà, che fanno molto <lb/>bene auuerrare quel comun detto macaronico, che</s>
</p>
<p style="it">
  <s xml:id="echoid-s5490" xml:space="preserve">Multa dicuntur, <lb/>Quæ non fiuntur.</s>
  <s xml:id="echoid-s5491" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5492" xml:space="preserve">E quel noſtro detto Italiano.</s>
  <s xml:id="echoid-s5493" xml:space="preserve"/>
</p>
<p style="it">
  <s xml:id="echoid-s5494" xml:space="preserve">Dal detto al fatto, <lb/>El vi è vn gran tratto.</s>
  <s xml:id="echoid-s5495" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5496" xml:space="preserve">Vidi propoſta l’eſperienza delle due laſtre, come da eſſo <lb/>fatta, dal Sig Sinclaro _lib._ </s>
  <s xml:id="echoid-s5497" xml:space="preserve">4. </s>
  <s xml:id="echoid-s5498" xml:space="preserve">_Dial._ </s>
  <s xml:id="echoid-s5499" xml:space="preserve">1. </s>
  <s xml:id="echoid-s5500" xml:space="preserve">n. </s>
  <s xml:id="echoid-s5501" xml:space="preserve">8. </s>
  <s xml:id="echoid-s5502" xml:space="preserve">oue dice che queſte, <lb/>erano circolari, di bronzo di tre diti in circa di diametro <lb/>dell a ſua miſura di Scotia. </s>
  <s xml:id="echoid-s5503" xml:space="preserve">Vidi con che ſecurezza il ſuo <lb/>ſeruo Dromone le attaccaua (vnite prima) ad vn chiodo <lb/>nel tetto; </s>
  <s xml:id="echoid-s5504" xml:space="preserve">poi appendeua all’inferiore libbre 60. </s>
  <s xml:id="echoid-s5505" xml:space="preserve">di peſo; <lb/></s>
  <s xml:id="echoid-s5506" xml:space="preserve">poi 30; </s>
  <s xml:id="echoid-s5507" xml:space="preserve">poi 9, e poi 1; </s>
  <s xml:id="echoid-s5508" xml:space="preserve">che con le altre ſommando libbre, <lb/>100. </s>
  <s xml:id="echoid-s5509" xml:space="preserve">cagionaua lo ſtaccamento dell’ inferiore della ſupe-<lb/>riore. </s>
  <s xml:id="echoid-s5510" xml:space="preserve">Io che haueuo vdito dire alli noſtri ſpecchieri, che <lb/>era quaſi impoſſibile il formare vn ſpecchio perfettamen-
<pb o="89" file="00183" n="183" rhead="QVINTO."/>
te piano (che perciò da queſto deuiamento dal piano ne <lb/>naſcono quaſi tutti li vitii di render imperfette l’imagini;) <lb/></s>
  <s xml:id="echoid-s5511" xml:space="preserve">e che haueuo letto in Girolamo Sirturo _De Teleſcopio part_. </s>
  <s xml:id="echoid-s5512" xml:space="preserve"><lb/>2. </s>
  <s xml:id="echoid-s5513" xml:space="preserve">_cap. </s>
  <s xml:id="echoid-s5514" xml:space="preserve">2. </s>
  <s xml:id="echoid-s5515" xml:space="preserve">Quæſiui diù Romæ, &amp; </s>
  <s xml:id="echoid-s5516" xml:space="preserve">Venetijs laminam planam, &amp; </s>
  <s xml:id="echoid-s5517" xml:space="preserve">mul-_ <lb/>_tas examinau er am,, quibus ſpecula adfricantur, ſed reuera ex ip-_ <lb/>_ſa lamina, atque ex ſpeculo in eadem elaborato vitrum_ (credo <lb/>vogli dire _vitium) deprehendebam, &amp;</s>
  <s xml:id="echoid-s5518" xml:space="preserve">c_. </s>
  <s xml:id="echoid-s5519" xml:space="preserve">E poco doppo. </s>
  <s xml:id="echoid-s5520" xml:space="preserve"><lb/>_Itaque vix vnam ex multis reperi ſine vitio, &amp; </s>
  <s xml:id="echoid-s5521" xml:space="preserve">quæ perfectè planæ_ <lb/>_dici poſſet, &amp; </s>
  <s xml:id="echoid-s5522" xml:space="preserve">c_. </s>
  <s xml:id="echoid-s5523" xml:space="preserve">me ne rideuo. </s>
  <s xml:id="echoid-s5524" xml:space="preserve">Poiche ſe vi è tanta difficoltà <lb/>a farne vna, che coſa vi vorrà a farne due?</s>
  <s xml:id="echoid-s5525" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5526" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s5527" xml:space="preserve">Quanto il Sig. </s>
  <s xml:id="echoid-s5528" xml:space="preserve">Ofredi hauerebbe torto ſe ſoſpettaſſe di <lb/>queſta eſperienza del Sig. </s>
  <s xml:id="echoid-s5529" xml:space="preserve">Sinclaro, tanto hà ragione d’af-<lb/>fermare che il formare queſte due laſtre ſia coſa laborio-<lb/>ſiſsima. </s>
  <s xml:id="echoid-s5530" xml:space="preserve">Et ha dalla ſua il nobiliſsimo Boile, il quale _De_ <lb/>_Firmi. </s>
  <s xml:id="echoid-s5531" xml:space="preserve">ſect_. </s>
  <s xml:id="echoid-s5532" xml:space="preserve">14. </s>
  <s xml:id="echoid-s5533" xml:space="preserve">dice di eſſe. </s>
  <s xml:id="echoid-s5534" xml:space="preserve">_Experientia nos docuit admodum eſſe_ <lb/>_difficile, ſi vllatenùs poſſibile, à vulgaribus noſtris artificibus vi-_ <lb/>_tra vel marmora procurare, quæ ad eiuſmodi exactitudinem acce-_ <lb/>_dant_ (cioè d’eſcluder perfettamente l’aria, e non laſciare, <lb/>che tra eſſi n’entraſſe.) </s>
  <s xml:id="echoid-s5535" xml:space="preserve">_Quippe_ (ſoggiunge egli) _difficulter_ <lb/>_admodum nanciſci potuimus vel expertos lapicidas vel peritos vi-_ <lb/>_trorum politores, qui nobis marmorum rotundorum par conficerent_ <lb/>_vnius alteriùſue duntaxat pollicis diametri, quæ ſe inuicem per_ <lb/>_contactum ad duo triaue ſaltem minuta in aere ſuſtinerent, &amp;</s>
  <s xml:id="echoid-s5536" xml:space="preserve">c_. <lb/></s>
  <s xml:id="echoid-s5537" xml:space="preserve">Hora ſe è tanto difficile à far queſto paro di laſtre di dia-<lb/>metro coſi piccolo, quanto ſarà più difficile farle di dia-<lb/>metro maggiore? </s>
  <s xml:id="echoid-s5538" xml:space="preserve">Creſcendo in eſſe la difficoltà con la, <lb/>grandezza. </s>
  <s xml:id="echoid-s5539" xml:space="preserve">_A_uuertino però che quì conſidera queſte due, <lb/>laſtre poſte in opera ſenza bagnarle con acqua, ò altro; </s>
  <s xml:id="echoid-s5540" xml:space="preserve"><lb/>poiche bagnandole ſe riem piono le minime cauità, che de <lb/>neceſſità eſſendo nelle loro ſuperficie, dãno addito all’aria <lb/>da inſinuarſi trà eſſe, e facilitare lo ſtaccamento.</s>
  <s xml:id="echoid-s5541" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5542" xml:space="preserve">Che poi l’eſperienza di queſte laſtre ſia difficiliſſima in tutte <lb/>le forme, vien pure rappreſentato dal medemo Boile _ſect_. <lb/></s>
  <s xml:id="echoid-s5543" xml:space="preserve">17. </s>
  <s xml:id="echoid-s5544" xml:space="preserve">con queſte parole. </s>
  <s xml:id="echoid-s5545" xml:space="preserve">_Sed hic omnino mihi annotandum habi-_ <lb/>_tum ad hoc, tum ad ſequentia experimenta de marmoribus politis_ <lb/>_commemoranda reſpectum nos nullum hactenus experimentorũ ge-_ <lb/>_nus deprehendiſſe, in quibus adeò leues circumſtantiarum variatio-_ <lb/>_nes conatus noſtros tantum, vt hìc, eluderent. </s>
  <s xml:id="echoid-s5546" xml:space="preserve">Idque profecto nar-_
<pb o="90" file="00184" n="184" rhead="DIALOGO"/>
_rauimus, vt, ſi fortè huiuſmodi repetantur experimenta, minus mi-_ <lb/>_rum videatur ſi non valeant alii primo, &amp; </s>
  <s xml:id="echoid-s5547" xml:space="preserve">ſecundo, vel etiam deci-_ <lb/>_mo aut viceſimo tentamine tantundem præſtare, ac nos præſtiti-_ <lb/>_mus, poſtquam creber vſus in percurioſo hoc experimento expertes_ <lb/>_nos feciſſet, &amp; </s>
  <s xml:id="echoid-s5548" xml:space="preserve">c_.</s>
  <s xml:id="echoid-s5549" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5550" xml:space="preserve">Queſte difficoltà, l’eſperienze fatte, e li peſi alzati ſi vedano <lb/>nel me demo Boile _nel detto trattat. </s>
  <s xml:id="echoid-s5551" xml:space="preserve">de Firm_. </s>
  <s xml:id="echoid-s5552" xml:space="preserve">che a me pare, <lb/>che ad eſſe ſe remedii aſſai bene con il modo propoſto dal <lb/>medemo _ſect_. </s>
  <s xml:id="echoid-s5553" xml:space="preserve">23. </s>
  <s xml:id="echoid-s5554" xml:space="preserve">e conſiderato dal Sig. </s>
  <s xml:id="echoid-s5555" xml:space="preserve">Borelli _prop_. </s>
  <s xml:id="echoid-s5556" xml:space="preserve">89. </s>
  <s xml:id="echoid-s5557" xml:space="preserve">Vna <lb/>di queſte laſtre s’incaſtri bene nel pauimento, e ſi collochi <lb/>parallela all’orizonte, l’aItra ſe gli ponghi ſopra, e per eſ <lb/>cluder l’aria, che non poſſi entrare tra eſſe, ſe ſommerga-<lb/>no nell’ acqua di modo che la comiſura trà eſſe ſia ſotto <lb/>acqua, e ſe procuri d’alzare la ſuperiore perpendicolar-<lb/>mente.</s>
  <s xml:id="echoid-s5558" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5559" xml:space="preserve">_Ofr_. </s>
  <s xml:id="echoid-s5560" xml:space="preserve">Io credo che queſta non potrà eſſer alzata conforza alcu-<lb/>na anco infinita.</s>
  <s xml:id="echoid-s5561" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5562" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s5563" xml:space="preserve">V. </s>
  <s xml:id="echoid-s5564" xml:space="preserve">S è in grande errore, perche non vi vorrà altra forza <lb/>ſe non quella, che ſnperi di poco, e la grauità della laſtra, <lb/>ſuperiore, e de ll’aria, che li ſouraſta, la quale è vguale al <lb/>predetto cilindro d’argentoniuo. </s>
  <s xml:id="echoid-s5565" xml:space="preserve">Per eſenipio ſiano le la-<lb/>ſtre di 4. </s>
  <s xml:id="echoid-s5566" xml:space="preserve">dita di diametro; </s>
  <s xml:id="echoid-s5567" xml:space="preserve">la ſuperiore peſi 2. </s>
  <s xml:id="echoid-s5568" xml:space="preserve">libbre, &amp; </s>
  <s xml:id="echoid-s5569" xml:space="preserve">vn, <lb/>cilindro di mercurio della medema baſe, &amp; </s>
  <s xml:id="echoid-s5570" xml:space="preserve">alto vn brac-<lb/>cio, &amp; </s>
  <s xml:id="echoid-s5571" xml:space="preserve">vn quarto peſi 30. </s>
  <s xml:id="echoid-s5572" xml:space="preserve">libbre. </s>
  <s xml:id="echoid-s5573" xml:space="preserve">Chitirera, ò adoprà forza, <lb/>ò peſo, che eccedi 32. </s>
  <s xml:id="echoid-s5574" xml:space="preserve">libbre ſeparerà la laſtra ſuperiore, <lb/>dall’inferiore; </s>
  <s xml:id="echoid-s5575" xml:space="preserve">con minore no. </s>
  <s xml:id="echoid-s5576" xml:space="preserve">V. </s>
  <s xml:id="echoid-s5577" xml:space="preserve">S. </s>
  <s xml:id="echoid-s5578" xml:space="preserve">eſper imenti ciò in que-<lb/>ſta guiſa come propone il Sig Borelli. </s>
  <s xml:id="echoid-s5579" xml:space="preserve">Sia la laſtra inferiore <lb/>D E, &amp; </s>
  <s xml:id="echoid-s5580" xml:space="preserve">il cilindro, o laſtra ſupe-<lb/>riore C A B. </s>
  <s xml:id="echoid-s5581" xml:space="preserve">che la combacci eſ-<lb/>
<anchor type="figure" xlink:label="fig-00184-01a" xlink:href="fig-00184-01"/>
quiſiramente in A B, ſia queſta, <lb/>attaccata in H, alla lance d’vna, <lb/>libra di braccia vguali, &amp; </s>
  <s xml:id="echoid-s5582" xml:space="preserve">all’al-<lb/>sra eſtremità K, ſia attaccato il <lb/>peſo N, vguale à quello della la-<lb/>ſtra C A B, &amp; </s>
  <s xml:id="echoid-s5583" xml:space="preserve">O, che ſuperi di po-<lb/>co quello del prederto cilindro <lb/>di mercurio. </s>
  <s xml:id="echoid-s5584" xml:space="preserve">Infallibilmente V. </s>
  <s xml:id="echoid-s5585" xml:space="preserve">S. <lb/></s>
  <s xml:id="echoid-s5586" xml:space="preserve">alzerà la laſtra.</s>
  <s xml:id="echoid-s5587" xml:space="preserve"/>
</p>
<div xml:id="echoid-div41" type="float" level="2" n="2">
  <figure xlink:label="fig-00184-01" xlink:href="fig-00184-01a">
    <image file="00184-01" xlink:href="http://echo.mpiwg-berlin.mpg.de/zogilib?fn=/permanent/library/9EXVCG1R/figures/00184-01"/>
  </figure>
</div>
<pb o="91" file="00185" n="185" rhead="QVINTO."/>
<p>
  <s xml:id="echoid-s5588" xml:space="preserve">_Ofr_. </s>
  <s xml:id="echoid-s5589" xml:space="preserve">Baccio la mano di V. </s>
  <s xml:id="echoid-s5590" xml:space="preserve">S. </s>
  <s xml:id="echoid-s5591" xml:space="preserve">Anch’io lo sò; </s>
  <s xml:id="echoid-s5592" xml:space="preserve">poichè in queſta, <lb/>guiſa non è poſſibile alzar la laſtra C A B, tanto rettamente <lb/>che non s’inclini qualche poco, alla quale inclinatione de-<lb/>ueſſi attrìbuire la ſeparatione; </s>
  <s xml:id="echoid-s5593" xml:space="preserve">altrimente chi tenterà alzar <lb/>la laſtra perpendicolarmente, ne anco con forza di Belze-<lb/>bù potrà ciò ottenere.</s>
  <s xml:id="echoid-s5594" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5595" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s5596" xml:space="preserve">Il Signor Borelli _nella predetta prop_. </s>
  <s xml:id="echoid-s5597" xml:space="preserve">regiſtra queſta ſua, <lb/>obiettione, e di eſſa dice. </s>
  <s xml:id="echoid-s5598" xml:space="preserve">_Huiuſmodi cauilloſa reſponſio con-_ <lb/>_donari potest ijs Philoſophis, qui mathematicis imperiti ſunt_. </s>
  <s xml:id="echoid-s5599" xml:space="preserve">V. </s>
  <s xml:id="echoid-s5600" xml:space="preserve">S. <lb/></s>
  <s xml:id="echoid-s5601" xml:space="preserve">s’è moſtrata nelli noſtri paſſati colloqui molto intendente <lb/>di geometria, e matematiche, onde certo non può fuggire <lb/>vna buona mula. </s>
  <s xml:id="echoid-s5602" xml:space="preserve">Il Sig. </s>
  <s xml:id="echoid-s5603" xml:space="preserve">Borelli per conuincere chi fa queſta <lb/>irragioneuole obiettioue porta _la prop_. </s>
  <s xml:id="echoid-s5604" xml:space="preserve">90. </s>
  <s xml:id="echoid-s5605" xml:space="preserve">molto bella. </s>
  <s xml:id="echoid-s5606" xml:space="preserve">Io <lb/>in altro modo (che è però ſimile al ſuo) e ſoggiungendo <lb/>qualche altra coſa, voglio conuincer’il Signor Ofredi, fa-<lb/>cendogli toccar con mano che in molti caſi ſarà aſſai più <lb/>difficile alzar la laſtra ſuperiore inclinãdola, che alzandola <lb/>perpendicolarmente: </s>
  <s xml:id="echoid-s5607" xml:space="preserve">onde ſe concede che ſe poſſi ſepara-<lb/>re inclinandola, ſarà aſtai più ragioneuole che ſe poſſi al-<lb/>zare perpendicolarmente. </s>
  <s xml:id="echoid-s5608" xml:space="preserve">Per moſtrarli queſto vorrei pri-<lb/>ma imparar da eſſo la ragione della leua, ò Vette, che hà il <lb/>fulcimento trà la forza, &amp; </s>
  <s xml:id="echoid-s5609" xml:space="preserve">il peſo.</s>
  <s xml:id="echoid-s5610" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5611" xml:space="preserve">_Ofr_. </s>
  <s xml:id="echoid-s5612" xml:space="preserve">La ſeruo in poche parole. </s>
  <s xml:id="echoid-s5613" xml:space="preserve">Sia la leua A B, il cui ſoſtegno <lb/>ſia in C; </s>
  <s xml:id="echoid-s5614" xml:space="preserve">in B, il peſo d’alzarſi; </s>
  <s xml:id="echoid-s5615" xml:space="preserve">e la forzain A. </s>
  <s xml:id="echoid-s5616" xml:space="preserve">Allora la for-<lb/>
<anchor type="figure" xlink:label="fig-00185-01a" xlink:href="fig-00185-01"/>
za ſoſtenirà il peſo, quando la medema proportione, che <lb/>hà B C, diſtanza del peſo dal ſuſtentacolo, all’A C, diſtanza <lb/>della forza dal medemo, l’habbia reciprocamente la forza
<pb o="92" file="00186" n="186" rhead="DIALOGO"/>
A, al peſo B. </s>
  <s xml:id="echoid-s5617" xml:space="preserve">Da ciò ne naſce il beneſitio, che ne cauiamo <lb/>dalla leua; </s>
  <s xml:id="echoid-s5618" xml:space="preserve">cioè che con poca forza potemo ſoſtenere vn <lb/>gran peſo, ogni qual volta applichiamo la forza alla parte <lb/>maggiore. </s>
  <s xml:id="echoid-s5619" xml:space="preserve">Per eſempio ſia AC, centupla di CB; </s>
  <s xml:id="echoid-s5620" xml:space="preserve">vna forza <lb/>in A, valeuole, ſenza la leua, a ſoſtenere vn peſo d’vna lib-<lb/>bra; </s>
  <s xml:id="echoid-s5621" xml:space="preserve">potrà mediāte la leua ſoſtenere vn peſo di libb. </s>
  <s xml:id="echoid-s5622" xml:space="preserve">100. </s>
  <s xml:id="echoid-s5623" xml:space="preserve">col <lb/>locato in B. </s>
  <s xml:id="echoid-s5624" xml:space="preserve">Onde queſta forza accreſciuta ogni pochino, <lb/>non ſolo lo ſoſtenirà, ma anco l’alzerà.</s>
  <s xml:id="echoid-s5625" xml:space="preserve"/>
</p>
<div xml:id="echoid-div42" type="float" level="2" n="3">
  <figure xlink:label="fig-00185-01" xlink:href="fig-00185-01a">
    <image file="00185-01" xlink:href="http://echo.mpiwg-berlin.mpg.de/zogilib?fn=/permanent/library/9EXVCG1R/figures/00185-01"/>
  </figure>
</div>
<p>
  <s xml:id="echoid-s5626" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s5627" xml:space="preserve">Ma ſe le braccia AC, CB, della leua ſaranno vguali, che <lb/>beneſitio ne caueremo da eſſa?</s>
  <s xml:id="echoid-s5628" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5629" xml:space="preserve">_Ofr_ Niuno certamente per queſto capo. </s>
  <s xml:id="echoid-s5630" xml:space="preserve">Perche in queſto ca-<lb/>ſo quanto ſarà il peſo, tanta forza vi vorrà a ſoſtenerlo, e <lb/>maggiore ad alzarlo. </s>
  <s xml:id="echoid-s5631" xml:space="preserve">Onde tanto ſarà alzarlo con la leua, <lb/>come ſenza eſſa.</s>
  <s xml:id="echoid-s5632" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5633" xml:space="preserve">_Mat_. </s>
  <s xml:id="echoid-s5634" xml:space="preserve">E ſe la leua ſarà de braccia ineguali, e nel fine del mag-<lb/>giore come in A, collocaremo il peſo, e la forza in B, che <lb/>vtile n’haueremo?</s>
  <s xml:id="echoid-s5635" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5636" xml:space="preserve">_Ofr_. </s>
  <s xml:id="echoid-s5637" xml:space="preserve">Non vtile, ma danno; </s>
  <s xml:id="echoid-s5638" xml:space="preserve">perche ſe A C, ſarà centupla di C B, <lb/>a ſoſtenere vna libbra dipeſo poſto in A, vi vorrà forza <lb/>equiualente a libbre 100. </s>
  <s xml:id="echoid-s5639" xml:space="preserve">poſta in B, per ſoſtenerlo. </s>
  <s xml:id="echoid-s5640" xml:space="preserve">E pure <lb/>ad alzarlo ſenza leua vi vorra forza poco più d’vna libbra, <lb/>come à ſoſtenerlo d’vna libbra ſolamente.</s>
  <s xml:id="echoid-s5641" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5642" xml:space="preserve">_Mat._ </s>
  <s xml:id="echoid-s5643" xml:space="preserve">Tutte queſte dottrine V. </s>
  <s xml:id="echoid-s5644" xml:space="preserve">S. </s>
  <s xml:id="echoid-s5645" xml:space="preserve">l’hà cauate dalle viſcere delle <lb/>mecaniche. </s>
  <s xml:id="echoid-s5646" xml:space="preserve">Hora in vece della leua A B, conſideriamo la. <lb/></s>
  <s xml:id="echoid-s5647" xml:space="preserve">D A B, ancinata, &amp; </s>
  <s xml:id="echoid-s5648" xml:space="preserve">angolara rettamente, &amp; </s>
  <s xml:id="echoid-s5649" xml:space="preserve">imaginiamo <lb/>che D A, ſia linea retta collocata nell’orizonte, e A B, ſopra <lb/>eſſo perpendicolare; </s>
  <s xml:id="echoid-s5650" xml:space="preserve">immaginiamo parimente che in D, <lb/>ſia poſto il peſo, &amp; </s>
  <s xml:id="echoid-s5651" xml:space="preserve">in B la forza. </s>
  <s xml:id="echoid-s5652" xml:space="preserve">Allora il ſoſtentacolo del-<lb/>la leua ſarà il punto A; </s>
  <s xml:id="echoid-s5653" xml:space="preserve">e parimente la forza in B, al peſo in <lb/>D, hauerà la proportione, che ha reciprocamente D A, ad <lb/>AB. </s>
  <s xml:id="echoid-s5654" xml:space="preserve">In queſto caſo quali benefitii ne sõminiſtrerà la leua?</s>
  <s xml:id="echoid-s5655" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5656" xml:space="preserve">_Ofred._ </s>
  <s xml:id="echoid-s5657" xml:space="preserve">Li medemi che l’altra prima A B, orizontale. </s>
  <s xml:id="echoid-s5658" xml:space="preserve">Se B A, ſa-<lb/>rà maggiore d’ A D, quanto più eccederà, con tanto minor <lb/>forza B, potremo alzare il peſo D. </s>
  <s xml:id="echoid-s5659" xml:space="preserve">Se D A, A B, ſaranno <lb/>vguali, vi vorrà tanta forza quanto peſo. </s>
  <s xml:id="echoid-s5660" xml:space="preserve">E ſe D A, ſarà <lb/>maggior d’A B, vi vorrà più forza che non è il detto peſo.</s>
  <s xml:id="echoid-s5661" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5662" xml:space="preserve">_Cont._ </s>
  <s xml:id="echoid-s5663" xml:space="preserve">Queſta ſorte di leua adoperiamo quando con il martel-<lb/>lo vogliamo cauare vn chiodo fitto nel muro, ò in qualche
<pb o="93" file="00187" n="187" rhead="QVINTO"/>
tauola. </s>
  <s xml:id="echoid-s5664" xml:space="preserve">Poiche il manico corriſponde alla B A; </s>
  <s xml:id="echoid-s5665" xml:space="preserve">il ferro è l’-<lb/>A D; </s>
  <s xml:id="echoid-s5666" xml:space="preserve">il ſoſtentacolo è in A, oue s’appoggia ſopra il muro, <lb/>ò tauola; </s>
  <s xml:id="echoid-s5667" xml:space="preserve">la forza s’applica in B; </s>
  <s xml:id="echoid-s5668" xml:space="preserve">il peſo, cioè il chiodo da <lb/>cauare s’applica in D, ouc dobbiamo conſiderare la fiſſura, <lb/>ò corna del martello, trà li quali ſi piglia il capo del chio-<lb/>do. </s>
  <s xml:id="echoid-s5669" xml:space="preserve">Quanto maggiore ſarà il manico B A, tanto maggior <lb/>aggiuto ſomminiſtrerà ad eſtraere il chiodo.</s>
  <s xml:id="echoid-s5670" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5671" xml:space="preserve">_Mat._ </s>
  <s xml:id="echoid-s5672" xml:space="preserve">Beniſſimo. </s>
  <s xml:id="echoid-s5673" xml:space="preserve">Hora conſideriamo nel ſchema ſeguente il <lb/>piano D E, e la colonna C A B, che lo bacci eſquiſitamente <lb/>in A B; </s>
  <s xml:id="echoid-s5674" xml:space="preserve">in C, ſia applicata la forza, che tirandola per l’M C, <lb/>procuri ſtaccarla. </s>
  <s xml:id="echoid-s5675" xml:space="preserve">Reſſiſte la colonna allo ſtaccamẽto con <lb/>la ſua grauità, e con quella d’vn cilindro d’aria, che ſe l’ap-<lb/>poggia ſopra alto quant’ è l’at-<lb/>
<anchor type="figure" xlink:label="fig-00187-01a" xlink:href="fig-00187-01"/>
mosfera, che pure biſogna ſpin-<lb/>gere, &amp; </s>
  <s xml:id="echoid-s5676" xml:space="preserve">alzare nell’alzar la colõ-<lb/>na;</s>
  <s xml:id="echoid-s5677" xml:space="preserve">la quale grauità come tãte fi-<lb/>bre perpendicolari premendo, e <lb/>grauitando ſopra li infiniti punti <lb/>del piano A B, ſi concepiſcono <lb/>grauitare tutte raccolte, &amp; </s>
  <s xml:id="echoid-s5678" xml:space="preserve">vnite <lb/>nel centro I, quaſi ſiano vn gra-<lb/>ue ſolo iui collocato, come be-<lb/>niſſimo conſidera il Sig. </s>
  <s xml:id="echoid-s5679" xml:space="preserve">Borelli. <lb/></s>
  <s xml:id="echoid-s5680" xml:space="preserve">Lo ſtaccamẽto della baſe della colonna dal piano ſi fà tut-<lb/>to in vna volta, sì che nell’atto di queſto la colonna non <lb/>appoggia ſopra il piano D E, che con il ſolo B Dobbiamo <lb/>adunque concepire vna leua IBC, angolata, nella quale <lb/>il peſo ſia collocato nel centro I, e la forza in C. </s>
  <s xml:id="echoid-s5681" xml:space="preserve">Ogni vol-<lb/>ta adunque che la forza in C, al peſo in I, hauera la mede-<lb/>ma proportione che la diſtanza IB, alla diſtanza BC, la for-<lb/>za ſarà equiualente al peſo; </s>
  <s xml:id="echoid-s5682" xml:space="preserve">sì che accreſciuta vn poco po-<lb/>co la forza ne ſeguirà lo ſtaccamento.</s>
  <s xml:id="echoid-s5683" xml:space="preserve"/>
</p>
<div xml:id="echoid-div43" type="float" level="2" n="4">
  <figure xlink:label="fig-00187-01" xlink:href="fig-00187-01a">
    <image file="00187-01" xlink:href="http://echo.mpiwg-berlin.mpg.de/zogilib?fn=/permanent/library/9EXVCG1R/figures/00187-01"/>
  </figure>
</div>
<p>
  <s xml:id="echoid-s5684" xml:space="preserve">_Ofr._ </s>
  <s xml:id="echoid-s5685" xml:space="preserve">Hò inteſo il reſto. </s>
  <s xml:id="echoid-s5686" xml:space="preserve">Quando CB, ſarà maggiore di BI, ſarà <lb/>più facile ſtaccar la colonna inclinandola che alzandola <lb/>perpendicolarmente; </s>
  <s xml:id="echoid-s5687" xml:space="preserve">ma quando BC, foſſe, ò vguale a IB, <lb/>ò d’eſſa minore, allora vi vorrebbe, ò vgual forza, ò mag-<lb/>giore, che ad alzarla perpendicolarmente.</s>
  <s xml:id="echoid-s5688" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5689" xml:space="preserve">_Mat._ </s>
  <s xml:id="echoid-s5690" xml:space="preserve">Vano adunque è il ſuo ſutterfugio. </s>
  <s xml:id="echoid-s5691" xml:space="preserve">Se adunque l’eſpe-
<pb o="94" file="00188" n="188" rhead="DIALOGO"/>
rienza moſtrerà che la laſtra ſuperiore s’alzi con la libra, ò <lb/>in altro ſimil modo, ſarà manifeſto che la difficoltà nell’al-<lb/>zarla non naſca dalla repugnanza al vacuo, ma bene dalla <lb/>preſſione dell’aria ſopra la colonna, che biſogna ſuperare <lb/>con il peſo della medema colonna.</s>
  <s xml:id="echoid-s5692" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5693" xml:space="preserve">_Cont._ </s>
  <s xml:id="echoid-s5694" xml:space="preserve">Il nobiliſſimo Boile hauendo conſideratione a queſta v-<lb/>nione delle due la ſtre, che naſca dalla preſſione dell’aria. <lb/></s>
  <s xml:id="echoid-s5695" xml:space="preserve">prende materia di dire, e proponer da conſiderare _ſect. </s>
  <s xml:id="echoid-s5696" xml:space="preserve">1. </s>
  <s xml:id="echoid-s5697" xml:space="preserve">de_ <lb/>_Firm. </s>
  <s xml:id="echoid-s5698" xml:space="preserve">Illud quoque diſquiri poſſet dependeatne a principio iam ex-_ <lb/>_plicato vitri ſoliditas. </s>
  <s xml:id="echoid-s5699" xml:space="preserve">Etiamſi enim partes eius ramoſœ vel ſibi in_ <lb/>_uicem intertextœ non videantur &amp; </s>
  <s xml:id="echoid-s5700" xml:space="preserve">politœ admodum ac lubricœ ap-_ <lb/>_pareant, attamen, cum ignis, qui ad fuſionem eas reduxit, proinde-_ <lb/>_que fluidas reddidit, iure eas ſubdiuiſiſſe, &amp; </s>
  <s xml:id="echoid-s5701" xml:space="preserve">in minutas valdè par-_ <lb/>_ticulas red egiſſe ſupponi queat, eaſdemque adeò ad aerem a ſe-_ <lb/>_metipſis ſecludendum iuuiſſe non adeò mirum videri debet, ſiim-_ <lb/>_mediatus minutorum eiuſmodi &amp; </s>
  <s xml:id="echoid-s5702" xml:space="preserve">politorum corpuſculorum conta-_ <lb/>_ctus ad eas in nexu retinendas dicatur ſufficere, &amp;</s>
  <s xml:id="echoid-s5703" xml:space="preserve">c._ </s>
  <s xml:id="echoid-s5704" xml:space="preserve">Propoſta <lb/>la conſideratione, la laſcia indeciſa. </s>
  <s xml:id="echoid-s5705" xml:space="preserve">Vorrei adunque ſen-<lb/>tire il parere diloro Signori.</s>
  <s xml:id="echoid-s5706" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5707" xml:space="preserve">_Ofr._ </s>
  <s xml:id="echoid-s5708" xml:space="preserve">Io ſenza molto penſarui inclino alla parte negatiua. </s>
  <s xml:id="echoid-s5709" xml:space="preserve">E la <lb/>ragione è queſta. </s>
  <s xml:id="echoid-s5710" xml:space="preserve">La contiguità naſce dalla preſſione dell’-<lb/>aria; </s>
  <s xml:id="echoid-s5711" xml:space="preserve">adunque rimoſſa queſta il vetro ſi diſſoluerebbe. </s>
  <s xml:id="echoid-s5712" xml:space="preserve">Ma <lb/>ciò non ſuccede. </s>
  <s xml:id="echoid-s5713" xml:space="preserve">Adunque, &amp;</s>
  <s xml:id="echoid-s5714" xml:space="preserve">c. </s>
  <s xml:id="echoid-s5715" xml:space="preserve">L’eſperienza l’habbiamo <lb/>nel Baroſcopio, &amp; </s>
  <s xml:id="echoid-s5716" xml:space="preserve">altri vaſi di vetro con li qua li ſi fà il vo-<lb/>to; </s>
  <s xml:id="echoid-s5717" xml:space="preserve">poiche fatto queſto le parti interiori di queſti non ſo-<lb/>no premute; </s>
  <s xml:id="echoid-s5718" xml:space="preserve">adunque li vaſi douerebbero diſſoluerſi, e re-<lb/>ſoluerſi nelli minimi corpuſcoli; </s>
  <s xml:id="echoid-s5719" xml:space="preserve">tanto più che le parti e-<lb/>ſteriori del vaſo ſono premute dall’aria, la qual preſſione <lb/>ſola alle volte (quando non ſono e groſſi, e di figura cur-<lb/>ua) è ſufficiente a ſpezzarli. </s>
  <s xml:id="echoid-s5720" xml:space="preserve">Ma ciò non ſuccede, perche <lb/>quando non ſi ſpezzano nel modo predetto, ſi conſerua-<lb/>no totalmente. </s>
  <s xml:id="echoid-s5721" xml:space="preserve">Adunque &amp;</s>
  <s xml:id="echoid-s5722" xml:space="preserve">c.</s>
  <s xml:id="echoid-s5723" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5724" xml:space="preserve">Di più alla cima d’vno di queſti vaſi per di dentro s’attacchi <lb/>vnſpaghetto, ò filo, dal quale penda vn pezzetto di vetro, <lb/>che fatto voto, reſti pendente in queſto, sì che poſſi libe-<lb/>ramente vibrare, e dondolare, e s’agiti il vaſo dimodo che <lb/>il pezzetto di vetro percuota nelli lati pur di vetro del va-<lb/>ſo. </s>
  <s xml:id="echoid-s5725" xml:space="preserve">Mentre che li minimi componenti il vetro non ſono
<pb o="95" file="00189" n="189" rhead="QVINTO."/>
tenuti vniti che dalla preſſione dell’aria, eſſendo nel va-<lb/>cuo, e di più percotendo vn vetro con l’altro douerebbero <lb/>certo diſſoluerſi. </s>
  <s xml:id="echoid-s5726" xml:space="preserve">Ma ſe ciò non ſuccederà, non doueremo <lb/>dire non eſſer il contatto ſolo delli minimi, che conſtituiſ-<lb/>chi la durezza del vetro?</s>
  <s xml:id="echoid-s5727" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5728" xml:space="preserve">Terzo è manifeſto a chi ha ò fatto da ſe, ò letto appreſſo chi <lb/>hà fatto l’eſperienze del Baroſcopio, che ſe ſopra il mercu-<lb/>rio del vaſo ſtagnante infondendoſi acqua, ò altro liquido, <lb/>e pian piano alzando il Baroſcopio, che diſcenda il mercu-<lb/>rio in eſſo contenuto, che prima era pendulo ſin’ altezza <lb/>del couſueto braccio, &amp; </s>
  <s xml:id="echoid-s5729" xml:space="preserve">vn quarto, e che arriuata la boeca <lb/>del Baroſcopio all’acqua; </s>
  <s xml:id="echoid-s5730" xml:space="preserve">queſta ſaliſce a riempirlo con <lb/>tanto empito, che ſe non ſi teneſſe feimo con ambidue le <lb/>mani, lo ſcagliarebbbe per aria ad alto con grandiſſima <lb/>velocità: </s>
  <s xml:id="echoid-s5731" xml:space="preserve">anzi alle volte, quando la canna non è ſufficien-<lb/>temente groſſa, la ſpezza. </s>
  <s xml:id="echoid-s5732" xml:space="preserve">Hora ſalendo l’acqua con tan-<lb/>to empito, e trouato li minimi del vetro non premuti, e <lb/>ſolo contigui, ſtriſciando ſopra eſſi, e radendo li lati del <lb/>vetro farebbe vn gran raſpamento, diſſipamento, e ſpargi-<lb/>mento d’eſſi. </s>
  <s xml:id="echoid-s5733" xml:space="preserve">Ma ciò non ſuccede. </s>
  <s xml:id="echoid-s5734" xml:space="preserve">Adunque, &amp;</s>
  <s xml:id="echoid-s5735" xml:space="preserve">c.</s>
  <s xml:id="echoid-s5736" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5737" xml:space="preserve">_Mat_ Queſte ragioni del Sig. </s>
  <s xml:id="echoid-s5738" xml:space="preserve">Ofredi mi paiono non poco cal-<lb/>zanti. </s>
  <s xml:id="echoid-s5739" xml:space="preserve">Alcuno però forſe ricorrerebbe a negare che nel tu-<lb/>bo, e valo vi foſſe vacuo, ma ò efluui di mercurio, ò altra <lb/>materia, che pur premendo li minimi del vetro impediſce <lb/>il loro diſcio glimento. </s>
  <s xml:id="echoid-s5740" xml:space="preserve">Altri poi trouerebbe forſe altre ri-<lb/>ſpoſte più adequate. </s>
  <s xml:id="echoid-s5741" xml:space="preserve">Io per me inclino a credere che non <lb/>ſolo il vetro. </s>
  <s xml:id="echoid-s5742" xml:space="preserve">ma tutti li altri corpi poſti nel vacuo non <lb/>conſeruino quella duritie, che hanno nel pieno. </s>
  <s xml:id="echoid-s5743" xml:space="preserve">Ma di <lb/>queſto con altr occaſione.</s>
  <s xml:id="echoid-s5744" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5745" xml:space="preserve">_Cont._ </s>
  <s xml:id="echoid-s5746" xml:space="preserve">La prima ragione del Sig. </s>
  <s xml:id="echoid-s5747" xml:space="preserve">Ofredi mi pare di niun valo-<lb/>re Poiche ſe bene ceſſa la preſſione dell’aria, nulladimeno <lb/>non cadono li minimi del vetro mercè la loro minima gra <lb/>uità. </s>
  <s xml:id="echoid-s5748" xml:space="preserve">Che vna laſtra ſi ſepari dall’altra, leuata, ò debilitata <lb/>la preſſione dell’aria, non è merauiglia, eſſendo conſide <lb/>rabilmente graue. </s>
  <s xml:id="echoid-s5749" xml:space="preserve">Ma li minimi del vetro qual grauità <lb/>poſſono hauere?</s>
  <s xml:id="echoid-s5750" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5751" xml:space="preserve">_Ofr._ </s>
  <s xml:id="echoid-s5752" xml:space="preserve">Queſta riſpoſta Sig. </s>
  <s xml:id="echoid-s5753" xml:space="preserve">Conte non vale vn fanfaro. </s>
  <s xml:id="echoid-s5754" xml:space="preserve">Perche <lb/>la medema propenſione al diſcendere, che hà la laſtra grã-
<pb o="96" file="00190" n="190" rhead="DIALOGO"/>
de, l’hà qual ſi ſia minima particella, e qual ſi ſia minimo <lb/>conſtituente corpo graue. </s>
  <s xml:id="echoid-s5755" xml:space="preserve">E ſe l’eſſetto del diſcendere nel-<lb/>li minimi è impedito, e ritardato; </s>
  <s xml:id="echoid-s5756" xml:space="preserve">l’impedimento, ò ritarda-<lb/>mento naſce dalla reſſiſtenza del mezzo. </s>
  <s xml:id="echoid-s5757" xml:space="preserve">Ma queſta nel <lb/>noſtro caſo è leuata, leuato il mezzo, eſupponendoſi va-<lb/>cuo, nel quale tutti li corpi grandi, piccoli, eminimi di-<lb/>ſcendere bbero con pari velocità. </s>
  <s xml:id="echoid-s5758" xml:space="preserve">Adunque quelli minimi <lb/>ſi ſcioglierebbero, e diſcenderebbero.</s>
  <s xml:id="echoid-s5759" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5760" xml:space="preserve">_Mat._ </s>
  <s xml:id="echoid-s5761" xml:space="preserve">Queſta diſceſa vgualmente veloce di tutti li graui nel va-<lb/>cuo, e con che proportione diſcendeſſero per il medemo, <lb/>ò diſcendino per diuerſi mezzi, e coſa ſopra la quale, e <lb/>per la quale mi paſſano molte coſe indigeſte per la men-<lb/>te. </s>
  <s xml:id="echoid-s5762" xml:space="preserve">Ancor loro Signori ſi prouedino dell’eruditiſſimo libro <lb/>del Sig. </s>
  <s xml:id="echoid-s5763" xml:space="preserve">Borelli vltimamente ſtampato _De Motionibus natu-_ <lb/>_ralibus a grauitate pendentibus,_ che con maggior comodità <lb/>voglio che diſcorriamo ſopra queſta materia.</s>
  <s xml:id="echoid-s5764" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5765" xml:space="preserve">_Ofr._ </s>
  <s xml:id="echoid-s5766" xml:space="preserve">Io venirò prouiſto di Mecanica.</s>
  <s xml:id="echoid-s5767" xml:space="preserve"/>
</p>
<p>
  <s xml:id="echoid-s5768" xml:space="preserve">_Mat._ </s>
  <s xml:id="echoid-s5769" xml:space="preserve">Li farà biſogno.</s>
  <s xml:id="echoid-s5770" xml:space="preserve"/>
</p>
</div>
<div xml:id="echoid-div45" type="section" level="1" n="24">
<head xml:id="echoid-head36" xml:space="preserve">Fine del Dialogo Quinto.</head>
<pb file="00191" n="191"/>
<pb file="00192" n="192"/>
  </div></text>
</echo>