Wallis's conical edge
Introduction  Figure 1.Wallis's Conical Edge with  Figure 2.Wallis's Conical Edge with , In geometry, '''Wallis's conical edge''' is a ruled surface given by the parametric equations: where ,  and  are constants.Wallis's conical edge is also a kind of right conoid. It is named after the English mathematician John Wallis, who was one of the first to use Cartesian methods to study conic sections.
See also * Ruled surface* Right conoid
References * A. Gray, E. Abbena, S. Salamon, ''Modern differential geometry of curves and surfaces with Mathematica'', 3rd ed. Boca Raton, Florida:CRC Press, 2006. ()
External links * Wallis's Conical Edge from MathWorld.