Descriptive geometry for students in engineering science and architecture; a carefully graded course of instruction (1915)
Armstrong, Henry F. (Henry Fry), 1868- · New York, J. Wiley & sons, inc.; [etc., etc.] · leaf 117
will have in them straight generator lines on both sur-faces. Hence, when the surfaces of cones are cut by those of other cones, or of cylin-ders, the apex points of the cones must be in the section planes made use of; and in 108 DESCRIPTIVE GEOMETRY the case of cylinders, their axes must be… … Fig. 105. surfaces, it is necessary to take any generator of one cylinder, or a parallel to itas ab, ab, and from some point in that line to draw another line, say ac, ac,parallel to the generators of the second cylinder. The H.T.s of these two linesare h and c respectively, and the plane of the…
Geometry, Descriptive
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