Shades and shadows, with applications to architectural details, and exercises in drawing them with the brush and pen .. (1912)
Ware, William R. (William Robert), 1832-1915 · Scranton, International Textbook Company · leaf 26
n surface. This way of finding the Shadow is called the Method of Envelopes. Fig. Q 1shows its application to finding the shadow upon a plane parallel to the axis of revolution, and Fig. Q 2, upona plane perpendicular to the axis. This result is the same as that obtained by Tangent Cones shown…
Shades and shadows
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