American horological journal, devoted to practical horology (1869)
Miller, George B · New York, G. B. Miller · leaf 39
naturalphilosophy, so that I will not intrude on yourvaluable space with another. One point inconnection therewith seems to create doubts inthe minds of not only obscure watchmakers, butalso prominent chronometer manufacturers—that is as to the modes of chain appliance: one being so that the chain… … 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.
Clocks and watches
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