Toroid (geometry)
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In mathematics, a toroid is a doughnut-shaped object, such as an O-ring. Its annular shape is generated by revolving a geometrical figure around an axis external to that figure. When a rectangle is rotated around an axis parallel to one of its edges then a hollow cylinder (resembling a piece of straight pipe) is produced.
If the revolved figure is a circle, then the surface of such an object is known as a torus.
[edit] Patents
- U.S. Patent 4,429,656 Toroidal shaped closed chamber whistle. February 7, 1984.
- U.S. Patent 4,686,928 Toroidal whistle. August 18, 1987.
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