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Summary
| Description |
English: Drawing of an Ellicott pendulum, a temperature compensated pendulum invented by British clockmaker John Ellicott 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 (f) is made of iron while the two peripheral rods (c) 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 (a), which press up on the pins (t) 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 more complicated mechanism its temperature compensation was probably inferior to the more widely used gridiron pendulum, and the Ellicott pendulum was not used in many clocks.
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| Date | |
| Source | Downloaded 2008-12-28 from 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 |
| Author | Augustin-Privat Deschanel |
| Permission (Reusing this file) |
Public Domain - Deschanel died in 1881, Everett in 1904 |
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This work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 70 years or fewer.  You must also include a United States public domain tag to indicate why this work is in the public domain in the United States.
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| This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights. | |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 07:12, 23 January 2009 | | 276 × 791 (15 KB) | Chetvorno | == 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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