Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 322
a pin,with which describe the curve orinvolute ab . . . . h,hy unwindingthe thread gradually from thecircumference, and this curve willbe the proper form for the teethof a wheel of the given diameter. In all the problems in whichcurves have been determined bythe position of points, the morenumerous… … Fig. 679. 306 MACHINE DESIGN AND MECHANICAL CONSTRUCTIONS. rolling a generating circle on the inside and outside of the pitch-circle; thusthe point A on the generating circle gives for the flank of the teeth the hypo-cycloid A B, and for the face the epicycloid A 0.
Mechanical drawing
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