American horological journal, devoted to practical horology (1869)
Miller, George B · New York, G. B. Miller · leaf 282
the line ofcentres is maintained to the same angular po-sition as the one past line of centres, whichceases at the moment the one before line ofcentres takes place. The next question is, what effect has this con-tact before and after the line of centres, bothas regards transmittance of motive… … adjusted, that b d is resting against the end ofbar a c, and at right angles to it. It will requireno separate discourse to prove that (stability ofparts excepted) no force acting on d b woulddisturb the equilibrium of these bars. Change,however, that angle a c b, say increase it, andin proportion…
Clocks and watches
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