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#Mon Aug 09 12:00:48 CEST 2010
Text__-4w2IKOcEd-WfYQ0GneCwQ_text=<p>In the mid-nineteenth century, attempts to conduct electricity through a vacuum in discharge tubes lead to the discovery of cathode rays, particle beams composed of electrons. These beams can be deflected by magnets. A fluorescent screen makes the effect visible.</p>
Text__-4w2IKOcEd-WfYQ0GneCwQ_title=Deflection of Cathode Rays in a Magnetic Field