Lange, David C. (David Christoph) · New York : John Wiley & Sons ; London : Chapman & Hall · leaf 105
ngent to the surface of theSphere. These points, which are points in the shade-line,are connected by a curved hne, which is the required shade-line. The procedure in finding the Shades and Shadows inFig. 49, is the same, except that the circumscribed linesare not parallel to the surface receiving… … Tonic Cap. PRINCIPLES OF SHADES AND SHADOWS 95
Shades and shadows · Geometry, Descriptive
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