Young, George, jr, Baxter, Hubert Eugene, joint author · New York, The Macmillan Co. · leaf 267
with their ownshadows. The shadows of the other points are found in theorder in which they are numbered. Points 5, 7, and 8 are 250 DESCRIPTIVE GEOMETRY [XII, § 210 auxiliary points used to determine the directions of the shadowsof the hnes on which they occur, though they are not on theoutHne of… … Fig. 233 of the circle on any plane will be the conic section cut by thatplane from the umbra. In Fig. 233, the circle abd is illuminated from the point p.The plane of the circle being parallel to V, the shadow on V willbe a circle, since the circle itself and its shadow are parallelsections of the…
Geometry, Descriptive
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