Anthony, Gardner Chace, 1856- (from old catalog), Ashley, George Francis, (from old catalog) joint author · Boston, D. C. Heath & co. · leaf 86
e-stricting the motion of the generatrix. Any warped surface may be generated by arectilinear generatrix moving so as to touchtwo linear directrices, and having its consecu-tive positions parallel either to a given plane,called a plane director, or to the consecutiveelements of a conical surface,… … Fig. 147. 70 DESCRIPTIVE GEOMETRY 102. A Surface of Revolution, Fig. 149, istlie locus of any line, or generatrix, the posi-tion of which remains unaltered with referenceto a fixed right line about which it revolves.This fixed right line is called the axis of revo-lution. A circle of the surface…
Geometry, Descriptive
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