American horological journal, devoted to practical horology (1869)
Miller, George B · New York, G. B. Miller · leaf 127
et P S be the distancebetween centres, P beingthe pallet staff and S thatof the balance; one forkand roller is indicatedby letters, the other byfigures. Now, if we takethe pallet angle of motionat 10^=i:c and the rollerangle at 40°, the point Bwill be the limit of actionof the impulse pin; thecurve… … and then P S = JT, distance of centres, P B = F, length of fork,_ FSin. (x+i,) . 8in. X In the case stated we have a: = 10°, Pallet angle. y = 40° Impulse pin angle. Assuming the fork to be unity, we may makethe following equation, taking one halt theangle—that is one side of the centre.l.Sin.…
Clocks and watches
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