Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 346
d by a point in the circle A E C, de-scribed upon A C as a diameter, and rolling upon the straight line M N. Theoutlines of the teeth are helical surfaces described about the cylinder formingthe screw, with the pitch A h equal to the distance, measured upon the primi-tive scale, between the… … Fig. 709. Fig. 710. helical form of the thread of the screw. Usually the points of the teeth andbottoms of the spaces are formed of a concave outline, adapted to the convexity 330 MACHINE DESIGN AND MECHANICAL CONSTRUCTIONS.
Mechanical drawing
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