Higbee, F. G · New York, John Wiley & Sons · leaf 98
so that it goes through the point O, the apex,and constantly touches the curveXY, thus generating a conical sur-face. In Fig. 69 the curved direc-trix is a circle and the resultingsurface is, therefore, a cone. A convolute surface is generatedby a straight hne moving so as tobe constantly tangent… … Fig. 69. at I, 2A, 3B, 7F. The most important convolute surfacecommercially is the helical con-volute, so-called because its cur-vilinear directrix is a heltx, andsince this surface is a special caseof helicoid it will be consideredin detail in connection with thatsurface. 77. A warped surface is a…
Geometry, Descriptive
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