Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 172
ine A a parallel to the ray oflight; project a till it intersects the line oflight A a in the elevation at a. The line ofshadow below a is the shadow of the edge ofthe cylinder, and is a straight line. The lineof shadow between a and e is the outline of thecircular part falling on a cylindrical…
Mechanical drawing
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