Patent Model - Improvement in Watch-Barrels

Maker and role
John Shawver, Patentee
Samuel Charles, Assignee
John Shawver, Assignee
Production date
Oct 31 1876
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Object detail

1 1/2 x 3/4" (3.8 x 1.9cm)
The objectives of Shawver's patent are "First, to prevent all damage to watch-train on the breaking of the mainspring and to the barrel or main wheel themselves; second, to prevent or obviate any backward motion upon the escapement; third, to secure a true and even rotation of the main wheel by making it an integral part of the winding-post; fourth, to lessen the chances of braking the mainspring by winding it from its outer end..." (Patent Number 183,980)
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