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File:Antique watch with stackfreed.png

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Antique_watch_with_stackfreed.png (475 × 479 pixels, file size: 77 KB, MIME type: image/png)

Summary

Description
English: Drawing of the movement of an antique pocketwatch from the 16th century. The view is of the back of the watch movement with the cover open. This watch incorporates a stackfreed, a rare mechanism that was used in the 15th and 16th century to even out the force of the mainspring, to improve accuracy. The stackfreed is the black cam (top) with a stiff curving spring with a roller pressing against it (top right). The stackfreed is turned by a pinion gear on the mainspring shaft (right of cam) projecting through the back plate of the watch. The declining retarding force of the spring on the cam as it turned allowed more of the mainspring's force through, compensating for the declining force of the mainspring as it unwound. The watch is wound up by inserting a key on the squared-off shaft of the pinion gear and turning. The numbered wheel (right) adjusted the rate of the watch by adjusting the force of the mainspring. A key was inserted on the squared-off shaft and turned.
Date
Source Downloaded 2012-05-29 from Frederick James Britten (1894) Former Clock and Watchmakers, E. & F.N. Spon, New York, p. 36, fig. 21 on Google Books
Author Unknown authorUnknown author

Licensing

Public domain
Public domain
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.

United States
United States
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/TimeThumbnailDimensionsUserComment
current21:50, 29 May 2012Thumbnail for version as of 21:50, 29 May 2012475 × 479 (77 KB)Chetvorno

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