Lange, David C. (David Christoph) · New York : John Wiley & Sons ; London : Chapman & Hall · leaf 79
\i.hs «N Fig. 26 \r- ^ Section Elevation PRINCIPLES OF SHADES AND SHADOWS 69 on both coordinates, or on the plan and elevation, or onany oblique plane. Let ab be the given straight line whose shadow fallson both the coordinates. (Figs. 24 and 22.) Imaginary Shadows are employed in this Case. The…
Shades and shadows · Geometry, Descriptive
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