Young, George, jr, Baxter, Hubert Eugene, joint author · New York, Macmillan · leaf 279
260 DESCRIPTIVE GEOMETRY (XII, § 216 i v Sc-- ^^; H ;i .>: . j f H t 11 1 1 \ 1 1 » 1 \ ; 1 > … FiQ. 242 XII, § 216] SHADES AND SHADOWS 261 III. The Secant 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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