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#Mon Aug 09 11:59:10 CEST 2010
Text__uofsoKOcEd-WfYQ0GneCwQ_title=Are Heavy and Inert Mass Equal?
Text__uofsoKOcEd-WfYQ0GneCwQ_text=<p>Einstein bases his new Theory of Gravity on the equivalence of heavy and inert mass, and is therefore interested in a precise verification, especially as regards the relationship between mass and energy. In his letter he discusses a method that employs a pendulum experiment, and another that uses a torsion balance \u2013 without knowing that both have already been performed successfully, the latter by E\u00F6tv\u00F6s back in 1891.</p>