Horn Torus

One of the three Standard Tori given by the parametric equations

$$x = (c+a\cos v)\cos u$$ (1)

$$y = (c+a\cos v)\sin u$$ (2)

$$z = a\sin v$$ (3)

with $a=c$. The inversion of a horn torus is a Horn Cyclide (or Parabolic Horn Cyclide). The above left figure shows a horn torus, the middle a cutaway, and the right figure shows a Cross-Section of the horn torus through the $xz$-plane.

See also Cyclide, Horn Cyclide, Ring Torus, Spindle Torus, Standard Tori, Torus

References

Gray, A. ``Tori.'' §11.4 in Modern Differential Geometry of Curves and Surfaces. Boca Raton, FL: CRC Press, pp. 218-220, 1993.

Pinkall, U. ``Cyclides of Dupin.'' §3.3 in Mathematical Models from the Collections of Universities and Museums (Ed. G. Fischer). Braunschweig, Germany: Vieweg, pp. 28-30, 1986.