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| Keywords: Mercury pendulum.png en Drawing of a mercury pendulum used in precision regulator clocks from a French physics book from 1878 The two glass flasks are filled with mercury which expands with an increase in temperature compensating for the increase in length of the pendulum due to thermal expansion of the rod keeping the period of swing constant About 10 inches 25 cm long this type was used in a style of mantle clock called a 'crystal regulator' Alterations to image Removed caption rotated to compensate for scanning error converted from JPG to PNG en Downloaded December 28 2008 from http //books google com/books id 1m4PAAAAYAAJ pg PA272 Augustin Privat Deschanel Joseph David Everett 1878 Elementary Treatise on Natural Philosophy D Appleton Co New York p 272 fig 207 translated from Privat Deschanel's Traité Élémentaire de Physique by Joseph David Everett on Google Books Augustin-Privat Deschanel 1878 Public Domain - Deschanel died in 1881 Everett in 1904 PD-old Pendulums | ||||
