Anthony, Gardner Chace, 1856- [from old catalog], Ashley, George Francis, [from old catalog] joint author · Boston, D. C. Heath & co. · leaf 125
ate planes. Pkinciple. Auxiliary spheres having theircenters at the intersection of the axes of thesurfaces of revolution will cut the intersectingsurfaces in circles, one projection of which willbe right lines. Construction. Fig. 180 illustrates thiscase. It will be observed that the… … Fig. 180. CHAPTER VII WARPED SURFACES 144. Warped Surfaces* are ruled surfaces,being generated by the motion of a right line,the consecutive positions of which do not liein the same plane. The right-line generatrixis governed in two distinct ways : 1. By contact with three linear directrices. 2. By…
Geometry, Descriptive
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