Grant, George B. (George Barnard), 1849-1917 · Boston, Grant gear works, incorporated · leaf 73
making an infinitenumber of turns about it, but never reach-ing it. It also has the entirely useless property thatthe pole will trace an involute of the basecircle if it is rolled upon the pitch circle (75). It possesses the property, not possessed byany other curve, that it will roll with anequal… … Xogarithtnic pitch lines Fig. 115.
Gearing
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