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Patent Drawing of the Hopkins Watch

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Patent Drawing of the Hopkins Watch.jpg Part of the Drawings from U. S. Patent 186838ThumbnailsRemaining Drawings from U. S. PatentPart of the Drawings from U. S. Patent 186838ThumbnailsRemaining Drawings from U. S. PatentPart of the Drawings from U. S. Patent 186838ThumbnailsRemaining Drawings from U. S. PatentPart of the Drawings from U. S. Patent 186838ThumbnailsRemaining Drawings from U. S. PatentPart of the Drawings from U. S. Patent 186838ThumbnailsRemaining Drawings from U. S. PatentPart of the Drawings from U. S. Patent 186838ThumbnailsRemaining Drawings from U. S. Patent
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The mainspring barrel E, of a very large diameter in proportion to the diameter of the watch, occupies nearly the full diameter of the movement. The spring itself, narrower and much longer than usual, is made in the patent model by riveting two ordinary springs together end to end. Over this barrel and attached to the stationary frame of the watch is placed a large thin ring A, cut on its inner diameter with 120 teeth. Near its edge the barrel E carries a stud g on which runs a pinion of 10 in mesh with the ring gear A. On this pinion is a wheel of 80 driving a pinion of 6 on the escape-wheel arbor. The 15-tooth escape wheel locks on a spring detent and gives impulse to the balance in one direction only, being a conventional chronometer escapement. The intermediate wheel and pinion, balance wheel, and balance cock have been adapted from a Swiss bar movement of the time.

Author
The Auburndale Watch Company
First American Attempt Toward the Dollar Watch
Author: Edwin A. Battison
Available from gutenberg.org
Dimensions
1212*546
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