Higbee, F. G · New York, John Wiley & Sons · leaf 183
of the curveddirectrices through their centers the surface becomes a cowshorn arch. A similar surface of this same general character is the warpedcone, shown in Fig. 141. In this surface the curvilinear direc-trices do not necessarily lie in parallel planes nor is the rectilineardirectrix in a… … WARPED SURFACES 173
Geometry, Descriptive
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