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 78
Fig. I I 1 Fic3. 11 2 … required angle a. The hypotenuse a 2 will be the requiredline. The triangles 6 o 1^ and 2 6* a* are equal and similar. Fig. F F 2 shows how, by similar processes, the angle ^between the given line and its projection on the verticalplane may be determined, in either plane of projection, bymeans of a…
Shades and shadows
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