Handbook for machine designers, shop men and draftsmen (1916)
Halsey, Frederick A. (Frederick Arthur), 1856-1935 · New York, McGraw-Hill book company, inc.; [etc., etc.] · leaf 111
of the cord is theline of action and the angle eghbetween this line and the com-mon tangent to the pitch circlesis the angle of obliquity or thepressure angle. This angle isobviously determined by thediameters of the base circlesselected and the value of theangle is the leading subject… … Fig. I. -Generation of aninvolute. Fig. 2.—Interference of involutegear teeth. nircnlar Pitch —J
Machine design
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