A handbook on the teeth of gears, their curves, properties, and practical construction (1890)
Grant, George B. (George Barnard), 1849-1917 · Lexington, Mass., Lexington Gear Works · leaf 67
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 hjperbolic 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. ICIRCULAR GEAP.S Case I. — When the focal distance is infinitely small the curves are circles,as in figure I. The lipk 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. ITELLIPTIC GEARS
Gearing
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