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 88
Fig. Y Y 2 … 78 SHADES AND SHADOWS TRIQONOMETRICAL TERMS 39. The angle between two lines may be defined either by Degrees, Minutes, and Seconds, as measured uponthe arc of a circle whose center is at the vertex of the angle, as in Fig. Z Z 1; or, by the ratios between the sides of a right-angled triangle formed…
Shades and shadows
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