Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 166
Fig. 297. Fig. 298. relative to this plane, in all which the shadow assumes the form of an ellipse;Fig. 300, the shadow cast by a circle horizontal to the ground plane on a verti-cal convex surface; Fig. 302, the shadow cast by a circle parallel to the vertical
Mechanical drawing
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