Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 176
circles described in theplan in the points B, F, G, E, which are projected to their correspondinghelical lines in the elevation at B^ F, G, and E. Transferring the point B toits appropriate position B on the edge A C D, and drawing through the latter aline, B Z>, at an angle of 45°, its… … The same processes are requisite to determine the outlines of the shadowscast into the interior surfaces of the corresponding nut (Fig. 324). Theseshadows are derived not only from the helical edge, A B D, but also from thatof the generatrix, A C. The principles here laid down and illustrated are a…
Mechanical drawing
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