Young, George, jr, Baxter, Hubert Eugene, joint author · New York, The Macmillan Co. · leaf 271
illuminated from the point L.The shadow within the niche is cast by the line abed. Theshadow begins at the point of tangency, c, between the curvebed and a ray of light through L. Succeeding points on theshadow are found by casting the shadow of bed on a series ofvertical planes, as explained in §… … Fig. 237 XII, § 216] SHADES AND SHADOWS 255 216. The Shade and Shadow on a Double-Curved Surface ofRevolution. The shade line, or separatrix, on a double-curvedsurface of revolution is the line separating the lighted from theunlighted portion of the surface, as shown in Fig. 225, and asdefined in…
Geometry, Descriptive
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