Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 174
Fig. 320. ray intersecting E F at e, which z^\ .. x i\ CL V 4^. \ / — 7I ^\Ji_ / i ¥■ / - I … Fig. 3:^1. Fig. 321 represents the projections of a screw with a single square thread,and placed in a horizontal position, A o! being the direction of the ray oflight. The shadow is simply that cast by the outer edge, A B, of the threadupon the surface of the inner cylinder; its outline is…
Mechanical drawing
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