Snyder, Virgil, 1869-1950, Sisam, Charles Herschel, b. 1879 · New York : H. Holt and Company · leaf 86
o 2 = 0. As before, let it be assumed that n > 0. The plane z = k inter-sects the surface in the hyperbola ^^ - -^^^ =1 z = 7ca^2nk b^2nk If A; > 0, the line x — 0, z = k \s the transverse axis and y = 0,z = k is the conjugate axis. If k < 0, the axes are interchanged.The lengths of the… … Fig. 29. The sections of the surface by the planes y = k are the con-gruent parabolas V^lfi a- 0- ..n 0 The vertices of theseparabolas describe theparabola ^ = - 2 H2r, a- = 0. The sections by theplanes x = A arecongruent parabolaswhose vertices de-scribe the parabola
Geometry, Analytic
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