American horological journal, devoted to practical horology (1869)
Miller, George B · New York, G. B. Miller · leaf 139
mind the signs used to express certain quan-tities. The hair-spring and the balance being intheir natural position of equilibrium, we sup-pose the balance to be made to describe anangle of rotation, a, and we ask what is theamount of coupling necessary to maintain itin this new position against the… … that extremity of the hair-spring whichis fastened. If we consider, in this newposition of equilibrium, the balance andhair-spring as forming one solid, the systemmust be in equilibrium under the action ofthe coupling applied to the balance, theamount of which, G-, is precisely what wewish to…
Clocks and watches
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