Young, George, jr, Baxter, Hubert Eugene, joint author · New York, Macmillan · leaf 270
angent tothe cone, an auxiliaryline fa and an auxil-iary cutting planeHA were used, asdescribed in § 154. In this manner the traces of the planes Xand Y which limit the shadow were found. The shadow ofthe base circle was found as described in § 211. The shadowof the base circle should be tangent to… … Fig. 234 252 DESCRIPTIVE GEOMETRY [XII, § 213 II. The Sun Shadow of a Cone. In Fig. 235, the sunshadow of the cone base is the circle fccde*, and the shadowof the apex on the same plane is a. Lines from a, tangentto the circle give the H traces of the shadow planes. TheV traces of the shadow planes…
Geometry, Descriptive
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