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 68
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 … Case IT. When the focal distance is finite and positive, the curves areellipses that will roll together if fixed on centers at their opposite foci, as inFig. II. The link is a moving bar connecting the two moving foci. /
Gearing
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