In geometry, Wallis's conical edge is a ruled surface given by the parametric equations x = v cos u , y = v sin u , z = c a 2 − b 2 cos 2 u {\displaystyle x=v\cos u,\quad y=v\sin u,\quad z=c{\sqrt {a^{2}-b^{2}\cos ^{2}u}}} where a, b and c are constants. Wallis's conical edge is also a kind of right conoid.
In geometry, Wallis's conical edge is a ruled surface given by the parametric equations x = v cos u , y = v sin u , z = c a 2 − b 2 cos 2 u {\displaystyle x=v\cos u,\quad y=v\sin u,\quad z=c{\sqrt {a^{2}-b^{2}\cos ^{2}u}}} where a, b and c are constants. Wallis's conical edge is also a kind of right conoid.
Source: Wikipedia "Wallis's conical edge" · CC BY-SA 4.0
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