Young, George, jr, Baxter, Hubert Eugene, joint author · New York, Macmillan · leaf 266
s together limit the shadow. 209. Shadow Falling on DifferentPlanes. If the surface of any solidcontains projections or recessionsfrom the main face, as shown inFigs. 230 and 231, then the partsfarther back will receive, in part orin whole, the shadows cast by theprojections.Let it be required to… … Fia. 230 248 DESCRIPTIVE GEOMETRY [XII, § 209 except that the traces of the light rays are found on the planeedef, rather than on H or on V. It will be noted that the widthof the shadow 1, is equal to the depth of the projection 2.Also, and for the same reason, 3 =4 = 5. The preceding example, and…
Geometry, Descriptive
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