Lange, David C. (David Christoph) · New York, John Wiley & sons, inc.; [etc., etc.] · leaf 87
74 SHADOWS OF LINES … PROBLEMS ON CASTING OF SHADOWS OF LINES 75 PROBLEMS ON THE CASTING OF SHADOWS OF LINES Note.—In the succeeding problems the following abbre-viations are used: u for up; / for forward; r for right;d for down; h for back; and I for left. PLATE III Determine the shadows of the following lines. 1. A…
Shades and shadows · Geometry, Descriptive
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