File:Verge_watch_escapement.png
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Verge_watch_escapement.png (442 × 345 pixels, file size: 33 KB, MIME type: image/png)
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Summary
DescriptionVerge watch escapement.png |
English: Drawing of a verge escapement (bottom) and balance wheel (top) from an early pocketwatch, in an 1820 encyclopedia. The verge escapement, the oldest mechanical escapement, was used from the 13th century, and was the first escapement used in clocks and watches. It consisted of a vertical rod, the "verge", with angled flat plates called "pallets" (e,f) attached. The pallets are pushed by the teeth projecting from a vertical wheel (c,d), turning the balance wheel alternately clockwise and counterclockwise, against the restoring force of the balance spring i. The verge was replaced by better escapements beginning around 1700 but verge watches continued to be made until the mid 1800s. |
Date | |
Source | Retrieved May 29, 2014 from Abraham Rees, Ed. (1820) The Cyclopaedia, or Universal Dictionary, Vol. 2, Longman, Hurst, Rees, Orme, and Brown, London, "Horology", Plate 31, fig. 6 on Google Books |
Author | Unknown authorUnknown author |
Licensing
Public domainPublic domainfalsefalse |
This media file is in the public domain in the United States. This applies to U.S. works where the copyright has expired, often because its first publication occurred prior to January 1, 1929, and if not then due to lack of notice or renewal. See this page for further explanation.
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Items portrayed in this file
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1820
File history
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 03:17, 30 May 2014 | 442 × 345 (33 KB) | Chetvorno | User created page with UploadWizard |
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Horizontal resolution | 28.35 dpc |
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Vertical resolution | 28.35 dpc |
File change date and time | 02:24, 30 May 2014 |
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