Roulette (curve) in this case, the point lies on the circle then the roulette is a cycloid. A related concept is a glissette, the curve described by a point attached to a given curve as it slides along two (or more) given curves. Formally speaking, the curves must be differentiable curves in the Euclidean plane. The "fixed curve" is kept invariant; the "rolling curve" is subjected to a continuous congruence transformation such that at all times the curves are tangent at a point of contact that moves with the same speed when taken along either curve (another way to express this constraint
Wheel of Death (Space Wheel) the Space Wheel. Some early versions were performed by a single artist and incorporated a counterbalance on the other end. Following fatal accidents, the apparatus fell out of favour for a time until it was re-introduced in the 1970s under the name "Wheel of Death". For its 2007 touring edition, Ringling Bros. started using the name Wheel of Steel, as the word "death" was not seen as family friendly from a public relations perspective. Noted artists who have performed on the wheel include Nik Wallenda, Elvin Bale and Bello Nock. The Wheel Of Death is also used on modern cruise