Walker, William, b. 1821 · New York : C. Scribner · leaf 78
sun. Thebeam of light will be invisible. Now cause a little dust, or smoke, orvapour from a kettle, to rise, and the beam of hght will instantly be-come visible. On Liglit and Shade. 49 When the local colour of the objects is dark, and unrc-flective or absorbent of rays, these laws are not so… … Fig. 34. objects. We have already said that in all cases shadeshould be perfectly even and free from spottiness. Thisfact applies to shade under all circumstances, on round ason flat surfaces. The simplest form on which gradationcan be seen is on a cylinder, such as the pillar (Fig. 34), oron a…
Drawing -- Study and teaching
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