Newcomb, Simon, 1835-1909 · New York, H. Holt and company · leaf 318
orming a cylindrical surface.Then turning the upper disk through any angle less than 180°, thethreads will form an hyperboloid of revolution, as shown in the other 292 OEOMETRY OF THREE DIMENSIONS. figure. The threads shown in the figure are those of one system only;by rotating the disk in the… … axis is vertical. By moving the cutting plane a little closer to thecentre, the bounding curves of the section will merge into the dottedlines, and the plane will be a tangent to the surface at their point ofintersection. 265. Equations of the Generatitig Lines. To study thelines in question, let…
Geometry, Analytic
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