Wallis's conical edge

In geometry, Wallis's conical edge is a ruled surface given by the parametric equations where a, b and c 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.

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Figure 2. Wallis's Conical Edge with a = 1.01 , b = c = 1
Figure 1. Wallis's Conical Edge with a = b = c = 1