File:Stackfreed.png

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Stackfreed.png ‎(462 × 460 pixels, file size: 13 KB, MIME type: image/png)

Summary

Description Drawing of early 16th century pocketwatch movement with stackfreed mainspring compensating device. The stackfreed is the eccentric cam near the top, engaged by the long springloaded roller arm. It's purpose was to compensate for the decline of the mainspring's force as it unwound. Early in the watch's running period, when the mainspring is fully wound and providing maximum torque, the stackfreed roller rests against one side of the depression in the cam, exerting a force which opposes the mainspring. Later in the running period, when the mainspring is almost run down and is providing less torque, the stackfreed roller rests on the other side of the cam notch and it's force aids the the mainspring. The dumbbell-shaped device under it is the watch's primitive balance wheel, the foliot. The adjoining source text seems to refer to this as a watch made in the 16th century, from the Soltykoff Collection. Alterations: removed caption, sharpened, converted to PNG.
Date
Source Downloaded from Nelthropp, Harry L. (1873) A Treatise on Watch-work, Past and Present, E.& F.N. Spon, London, p.60, fig.3 on Google Books
Author Harry Leonard Nelthropp
Permission
(Reusing this file)		 Public domain - author has been dead more than 70 years

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Date/TimeThumbnailDimensionsUserComment
current23:48, 5 December 2007Thumbnail for version as of 23:48, 5 December 2007462 × 460 (13 KB)Chetvorno{{Information |Description=Drawing of antique watch with stackfreed mainspring compensating device. The adjoining text seems to refer to this as a watch made in the 16th century, from the Soltykoff Collection. Alterations: removed caption, sharpened, c
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