Higbee, F. G · New York, John Wiley & Sons · leaf 98
ith thatsurface. 77. A warped surface is a ruledsurface generated by a straightline so moving that the elementsof the resulting surface neitherintersect nor are parallel. Thusin Fig. 71 the generating line AXso moves that the elements of theresulting surface neither intersectnor are parallel. In… … Fig. 70. 88 ESSENTIALS OF DESCRIPTIVE GEOMETRY
Geometry, Descriptive
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