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 6
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 the I pitch line, usually one sixth of its full .;j)»» height,forms the face of the tooth. j^y Similarly, if a small circle,B, be rolled around on… … .0^
Gearing
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