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 77
untilit is parallel to the vertical plane, the point a will moveto the point 1; b 1 and o / will be equal to 6* a*;the angle at P will be the required angle a; and thehypotenuse ly b, now parallel to the vertical plane, willbe the required line. (2) If the triangle is revolvedabout its base a* b…
Shades and shadows
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