Hood, Grant · Kansas City, Mo. : Kansas City Jeweler and Optician · leaf 141
THE LEVER ESCAPEMENT. the length of the lever either .6 or .7 of the diameter of theescape wheel. The size of the roller and the length of the lever vary, alarge roller and a short lever giving the balance impulseduring a less number of degrees than a long lever and asmall roller. The radius of the…
Clocks and watches
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