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 80
Fig. N N 1 Fig. N N 2 meeting at its Vertex, as in Fig. M M 2. The points inwhich these elements are cut by the secant plane give thesame ellipse as that found in the previous figure. The other Conic Sections, that is to say hyperbolas andparabolas, can be obtained by .similar processes. IS. Figs.…
Shades and shadows
Internet Archive · Cornell University Library · Public Domain Mark 1.0. Free to use for anything.
