Hood, Grant · Kansas City, Mo. : Kansas City Jeweler and Optician · leaf 169
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 … Fig. 4. 80 -^ 12 or 6 2-3 revolutions; the barrel makes five revolutions.As the center pinion carries the minute hand and makes onerevolution every hour, a watch so constructed would run33 1-3 hours with five turns of the arbor in winding. In many 162 THE MAINSPRING. cases the arbor will make more…
Clocks and watches
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