U.S. patents covering time keeping mechanisms (1892)
United States. Patent Office · [Washington : United States Patent Office] · leaf 67
ainspring-shaft is turned backward to wind up the clock, butnot when the shaft is turned forward to drivethe clock-train so that after the mainspringhas run down a certain number of times a 95further winding up of the springwill releasethe lock, substantially as described. In testimony whereof I… … Fi 1 c .a. i JS
Clocks and watches
Internet Archive · Smithsonian Libraries · Public Domain Mark 1.0. Free to use for anything.
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