Hood, Grant · Kansas City, Mo. : Kansas City Jeweler and Optician · leaf 169
t have a certain number of coils inthe spring. A spring that is too long will prevent a watch from run-ning its full time, as well as one that is too short. In otherwords, if the spring has too many coils and fills up the barrel 161 MODERN METHODS IN HOROLOGY. more than one-third of its area, it is… … Fig. 3- revolutions as the spring runs down. Suppose the barrelhas 80 teeth and the center pinion has 12 leaves; then whilethe barrel makes one revolution, the center wheel will make
Clocks and watches
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