Young, George, jr, Baxter, Hubert Eugene, joint author · New York, The Macmillan Co. · leaf 277
Fig. 241 260 DESCRIPTIVE GEOMETRY [XII, § 216 0^ … Pro. 242 XII, § 216] SHADES AND SHADOWS 261 III. The Seca-Nt Plane Method. In this method use ismade of secant planes passing through the source of light andcutting the surface in a curved line, as in Fig. 242. A ray oflight in such a plane and tangent to the curve of intersection,r, s, t, will…
Geometry, Descriptive
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