A handbook on the teeth of gears, their curves, properties and practical construction (1885)
Grant, George B. (George Barnard), 1849-1917 · [Boston] · leaf 6
small circle5a,be rolled around onthe outside of the pitch circle,p, a fixed^ tracing point, a, in its edge, will trace• out the dotted line called an epicycloid,•and a small part of this curve near theI pitch line, usually one sixth of its fulliiy/ height,forms the face of the tooth. Similarly, if… … FIG. 3. THE EPICYCLOIDAL TOOTH.
Gearing
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