Lange, David C. (David Christoph) · New York, John Wiley & sons, inc.; [etc., etc.] · leaf 104
surface, at pointswhich are the shadows of the points of crossing. The pointof intersection of two shadow-lines is the shadow of thepoint of intersection of those lines casting the shadows,if the lines intersect on the surface; or the shadow of thepoint in which the shadow of one line crosses the… … Fig. 45
Shades and shadows · Geometry, Descriptive
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