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 37
ound line. 10. But, if the shadow of a point falls, not upon a plane parallel to a principal plane of projection,but upon an inclined plane or upon an irregular surface, it is necessary first to pass an auxiliary Hne throughthe point, find the shadow of this line upon the given surface, and then… … Fig. 6 A
Shades and shadows
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