Young, George, jr, Baxter, Hubert Eugene, joint author · New York, The Macmillan Co. · leaf 276
downward,but the solution is the same in principle. Considerable in-genuity is possible in handling this method when the apex ofa cone falls off the paper or on a level with I. If the shadow of the surface is required, it may be cast as inI above, or point by point from the shade line, or by a… … Fig. 241 260 DESCRIPTIVE GEOMETRY [XII, § 216 0^
Geometry, Descriptive
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