Patent Model - Improvement in Safety Center-Pinions for Watches

Maker and role
George Dickinson, Patentee
Production date
Mar 25 1879
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Object detail

1 3/4 x 1/2" (4.4 x 1.3cm)
Dickinson's patent relates to "a frequent accident to which all watches are liable is the breaking of he mainspring, which can be replaced by a new spring at small expense..." His improvement is to "remove such danger altogether.... by mounting the pinion on a journal formed on its arbor, on which it is entirely free to turn either forward or backward between collars or end bearings, that keep it at all times properly in gear with the main wheel." (Patent Number 213,550)
Object number
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