Young, George, jr, Baxter, Hubert Eugene, joint author · New York, Macmillan · leaf 265
and let it be required to findthe shadow of ah. The shadow ofa falls on H, at a. The shadowof h falls on V, at 6. The lineconnecting these two points willbe broken at HA. The direction of the shadow line may be established by casting the shadowof h as it would fall on H if it were not intercepted… … Fig. 228 XII, § 209] SHADES AND SHADOWS 247
Geometry, Descriptive
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