Plane and solid analytic geometry; an elementary textbook (1904)
Ashton, Charles Hamilton, 1866-1936 · New York, C. Scribner's Sons · leaf 272
Fig. 20. Fig. 21. parallel to the X-F-plane are ellipses whose axes increaseas the section recedes from the origin. Sections made byplanes parallel to the other coordinate planes are parabo- Ch. V, § 33] QUADRIC SURFACES 255 las, which have their axes parallel to the Z-axis. Thissurface is shown in… … 2 2 loid. If b = #, -- -f- &- = 2 cz represents a paraboloid of a a revolution about the Z-axis.
Geometry, Analytic
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