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 57
the two teeth. If we make a drawing, showing the two teeth in several posi-tions, preferably at equal intervals of their action, we can deter-mine the work done within the limits of each interval by multi-plying together the factors as found by measurement. The totalwork done between any two points… … Fig. I. Analytical Process. and twenty teeth, the tangential force, 0 P, between the two gearsis assumed to be constant and unity, and the coefficient of frictionis assumed to be one-tenth. The describing circle, with radius0M= Ty has three teeth, so that a gear of six teeth would haveradial flanks…
Gearing
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