Ames, William L. (William Lewis), 1855-, Wischmeyer, Carl · New York, McGraw-Hill book company, inc.; [etc., etc.] · leaf 54
he vertex of a cone with its base in H and its elements making the given angle with the plane of the base. The points of intersec-tion of the circleof the base withthe H trace of theplane will indicatethe elements of thecone which coincidewith the plane, andhence A and B arethe desired lines.… … Fig. 70. 44 DESCRIPTIVE GEOMETRY
Geometry, Descriptive
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