American horological journal, devoted to practical horology (1869)
Miller, George B · New York, G. B. Miller · leaf 38
0, P the force and direc-tion of spring, and W the effect on the centrepinion. We have here a simple lever, of whichB 0 is the long and B H the short arm, theelasticity of the spring equal P, the effect onthe pinion equal W, hence B C: B H : : P: W,and so the resultant of spring force, orBH. P W PC… … I beg to notice the two modes of leading offthe mainspring force: 1st, by teeth on thebarrel or chain; and 2d, the one by a wheelmounted on the barrel arbor. The first one isnow almost universally in use in non-fuzeewatches, and possesses a property of compensa-ting the varying spring force which I…
Clocks and watches
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