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 52
f the one form,and the flanks of the other. It is simpler andeasier, as well as more correct, to apply thename cycloidal to both face and flank, and tothe whole system, as is sometimes done. As before stated, the cycloidal system canbe more easily developed and studied by therolled curve theory… … The Cycloid ways a normal to the curve, and therefore, todraw a normal to any given point P, strikea circle through the point having a diameter Fig. 32Cycloidal Teeth
Gearing
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