Higbee, F. G · New York, John Wiley & Sons · leaf 99
revo-lution. In Fig. 72 the circle whose center is at O is re-volved about the axis of revolution AB. The resulting surface is a double curved surface of revolution called an annular torus. In the figure one-quarter of the surface has been cut away in order to show the curvilinear generatrix.… … SURFACES 89 on a plane surface so that all the elements will coincide with theplane. In Fig. 73 is shown a cone lying in a plane so that theelement OX coincides with plane. If the cone be now rolledout the curve of the base will rectify itself on the line xx as theelements of the surface…
Geometry, Descriptive
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