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
Order of the Wheel of the Thunder Dragon Order of the Wheel of the Thunder Dragon The Order of Wheel of the Thunder Dragon (Dzongkha : "Druk Khorlo") is a Single Class Order ranking fourth in the Order of Precedence. It was instituted by King Jigme Dorji Wangchuck on 9 February 1967 an reorganized by King Jigme Khesar Namgyal Wangchuck in January 2008 and consists of a neck Badge and a matching miniature. The 65 mm badge, comprises a back plate of dorjee the point of which form an outer circle, within which a black enamelled circle encloses the King's portrait in gold, on a background of enameled