Roulette (curve) application of this is that a square wheel could roll without bouncing on a road that is a matched series of catenary arcs. Roulette (curve) In the differential geometry of curves, a roulette is a kind of curve, generalizing cycloids, epicycloids, hypocycloids, trochoids, and involutes. Roughly speaking, a roulette is the curve described by a point (called the "generator" or "pole") attached to a given curve as that curve rolls without slipping, along a second given curve that is fixed. More precisely, given a curve attached to a plane which is moving so that the curve rolls, without slipping, along
Rolling stock of the South Manchuria Railway number, which followed the type indicator letter. This class designator was then followed by the road number, counted starting at 1. As in Period 2, the American-style wheel arrangement was used as the basis for the classification system introduced in 1920. However, in the new system, the American name was used as the basis for the class name, using two syllables of the American name as the new class name. The class name was made up of three katakana, of which the first two indicated the wheel arrangement, and the third indicated the class number – i.e. first, second, third,