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attached to the bob, raising the bob. This compensates for the lengthening of the central rod, keeping the bob at the same distance from the pendulum pivot. Therefore the pendulum's length to its center of mass, and its period of swing, stays constant with changes in temperature. Because of the
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783:== Summary == {{Information |Description={{en|1=Drawing of an Ellicott pendulum, a temperature compensated pendulum used in precision clocks, from a French physics book from 1878. Around a foot long, it was used in small mantel clocks. Alterations to ima
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are made of brass, which has a higher thermal expansion. With a rise in temperature, the central rod expands and gets longer, but the two brass rods expand more and press down on the levers
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in 1752, used in some small French mantel clocks in the 1800s, from a French physics book from 1878. Around a foot long. The central rod
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be in the public domain in these countries, which moreover do
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Augustin Privat
Deschanel, Joseph David Everett (1878)
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Add a one-line explanation of what this file represents
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Public Domain - Deschanel died in 1881, Everett in 1904
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Commons is a freely licensed media file repository.
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