A handbook on the teeth of gears, their curves, properties, and practical construction (1887)
Grant, George B. (George Barnard), 1849-1917 · [Boston] · leaf 75
curves that will roll together may be used as the pitch lines ofgear wheels, and therefore we can have gears with either circular, elliptic,parabolic, or hyperbolic pitch lines. In either case the moving foci may be connected by a link that will holdthe two gears together when in motion, and this… … Fig. ICIBCVLAli GEABS Case I. — When the focal distance is infinitely small the curves are circles,as in figure I. The link is here simply a fixed bar connecting the two centers,for the two foci are combined in one point at the center. ving focus Fig. ITJEXTilPTIC GEABS
Gearing
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