Lange, David C. (David Christoph) · New York : John Wiley & Sons ; London : Chapman & Hall · leaf 103
Fig. 47 92 GENERAL METHODS … PRINCIPLES OF SHADES AND SHADOWS 93 tangency of the shadow of one Hne with the bounding lineof the shadow, the points in the shade-Une on the surfaceof the Qbject which casts these points of shadow may bedetermined by passing back along each Ray of Lightthrough the point of tangency. A curved line…
Shades and shadows · Geometry, Descriptive
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