Ziwet, Alexander, 1853-1928, Hopkins, Louis Allen, joint author · New York, The Macmillan company · leaf 260
etthe surface. 267. Cross-Sections. The cross-sections at right angles toOx, at the distance h from the origin are r 1-^^ = 1; these are imaginary as long as h < a;for h>a they are ellipses with ever-increasing semi-ajces as we recede fromthe origin. The cross-sections at right angles to… … Fig. 129 _ ^ J- ^. .^1, _^_.V. + ^^1 a V- & a? V c are hyperboloids of two sheets, the former being met by Oy,the latter by Oz, in real points. The hyperboloid of two sheets extends to infinity. 268. Hyperboloid of Revolution of Two Sheets. If & = c in the equation of § 266, the…
Geometry, Analytic
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