Fritts, Charles Edgar. [from old catalog] · Philadelphia, The Keystone · leaf 115
ill amount to 24 minutes in a day, it is important tobe as exact as possible in our trials. In the usual method offitting springs, where the balance is caused to vibrate only bythe strength of the spring, counteracted by the staggering ofthe balance as it is supported by the stiffness of the spring… … Fig. II. Breguet spring can be fitted in half the usual time with thistool, and done better, with no risk of injuring it by numeroustrial pinnings in the collet and stud, which is almost unavoid-able while following the usual methods. It will also be notedthat by raising the point of the runner/…
Clocks and watches
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