American horological journal, devoted to practical horology (1869)
Miller, George B · New York, G. B. Miller · leaf 39
great wheel, P centre pinion, C the chain.The difference is equal to the amount of pres-sure, and hence friction and wear exerted onthe respective fulcrums of a lever of the firstand third order. … Let a b represent a straight lever resting onthe fulcrum F; let F b = 10 inches and F a= 9, and a weight suspended from 6=9, thenwe should require a force at a to keep thisweight in equilibrio and the pressure on F would be =10-]- 9=19.If we substitute for the weight at b the pres-sure on the…
Clocks and watches
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![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer02inte-159-67.webp)
