hod of makingthe pallets for the ordinary American clock, Fig. 43, be-comes readily intelligible. The sole object of curving thepallets, as explained previously, was to decrease the buttingeffect of the run on the points of the teeth. This is ac- THE MODERN CLOCK. 147 complished in Fig. 43 by… … Fig. 44. Recoil with Curved Planes. ing all purposes,while the gain in the cost of manufactureby using straight instead of curved pallets and wheel teethis very great. One factory in the United States is turning out 2,000,000annually of two movements, or about 1,000,000 of eachmovement; there are…
Clocks and watches
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