File:Grasshopper escapement.png
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Summary
| Description |
English: A diagram of the grasshopper escapement invented by British clockmaker John Harrison in 1722. An escapement is a mechanical linkage in a clock that gives the clock's pendulum periodic pushes to keep it swinging, and releases the clock's gear train to advance a fixed amount each swing, moving the hands forward at a steady rate. The grasshopper was an unusual low friction escapement that was used in a few clocks made by Harrison and the Vuillamy brothers, but did not see wide use. |
| 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 33, fig. 5 on Google Books |
| Author | Unknown author |
Licensing
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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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This image might not be in the public domain outside of the United States; this especially applies in the countries and areas that do not apply the rule of the shorter term for US works, such as Canada, Mainland China (not Hong Kong or Macao), Germany, Mexico, and Switzerland. The creator and year of publication are essential information and must be provided. See Wikipedia:Public domain and Wikipedia:Copyrights for more details.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 07:45, 30 May 2014 | | 219 × 306 (14 KB) | Chetvorno | User created page with UploadWizard |
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