Higbee, F. G · New York, John Wiley & Sons · leaf 149
Fig. 110. 138 ESSENTIALS OF DESCRIPTIVE GEOMETRY allel to H so that all the H traces of the auxihary planes wiU beparallel to it. The plane S cuts one element from the righthand cone and two elements from the other; the elements in-tersect at B and D, two points on the curve of intersection. Inlike… … Fig. III. Construction. When the bases of the given cones are indifferent planes. In Fig. Ill two right cones, one with its base in H and theother with its base in P, intersect. As before, the apices arejoined; this line OQ is common to all the auxiliary planes andits H piercing point, 0, is…
Geometry, Descriptive
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