Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 296
n can consist only ofstraight lines. B. A Cylinder and a Cone. In the case of a cylinderand a cone, since no two elements of the cone are parallel,there can be but one element of the cone parallel to the ele-ments of the cylinder; but this element of the cone will thenbe parallel to all the… … In Fig. 326, which shows an //-projection only, let A be thebase of the cone, and B the base of the cylinder, both bases inH. Let the //-trace of the line through the vertex of the coneparallel to the elements of the cylinder be at s, which is neces-sarily on the base of A, for reasons which have…
Geometry, Descriptive
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