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 95
a right circular vertical cone whose generators are at, say a° to the H.P.Two a° tangent planes may now be represented by their H.T.s at ac and ad,to contain the line AB; and because parallel planes have their H.T.s parallel,and AB is a parallel to all the tangent planes to the given cylinder,… … Fig. 88. of the cylinder, as at e, f, g and h. Each of these four planes contains onegenerator of the cylinder, and therefore, since the generators of the cylinder are
Geometry, Descriptive
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