Walker, William, b. 1821 · New York : C. Scribner · leaf 69
ays as it may happen to receive from surrounding ob-jects. The illuminating of objects may be further illustrated 40 On Light and Shade. by the diagram below (Fig. 26), where the lines, a a a,represent rays of light, and A b and c, planes interceptingthose rays. It will be apparent that as the… … Fig. 26. » 62. But there is another fact which must here be ob-served. AVhen objects are not illumined from one point orfocus alone, as the sun, but from surrounding objects, also,and from the particles of atmosphere, that secondary illu-mination is called reflection, and thus much visible shadeis,…
Drawing -- Study and teaching
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