Tanner, J. H. (John Henry), b. 1861, Allen, Joseph · New York, American Book Co · leaf 277
e ellipticparaboloid, and may be con-ceived as being generated bya variable parabola which hasits vertex upon, and movesalways perpendicular to, a fixed parabola, the axes of the two parabolas being parallel and lying in the same direction. This definition leads directly to equation [87].* Every… … Fio 106. Similarly, the equation — — ^ = « «= 6* • See Art. 156. 157-169] QUADRIC SURFACES 261 has for its locus a surface such as is represented in Fig. 106.This quadric is the hyperbolic paraboloid, and may be conceivedas generated by a variable parabola which has its vertex upon
Geometry, Analytic
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