Inventors at work, with chapters on discovery (1906)
Iles, George, 1852-1942 · New York, Doubleday, Page & company · leaf 272
ual perfection. Its wheels, pinions, balance-staffs are manufactured auto- Time-Pieces matically, as at Waltham, Massachusetts, to anaccuracy of 1/5000 inch or even less, thanks tothat great inventor, Mr. Duane H. Church. In modern watch-making the most durable materials are used, magnetic… … Earnshaw compensated bal-ance wheel for watches. It nearly semicircular and attached at one end to a stout diameter.Its outer rim, being made of brass, when warmed expands morethan its inner rim of steel. Thus,in a rising temperature the wheelcurves inward with its duly placedweights, so that the…
Inventions · Inventors
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