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
The Rolling Bridge which may still be seen at Fort Nelson, Portsmouth. Certain types of bascule bridges roll on an arc; an example is the Pegasus Bridge. The Rolling Bridge The Rolling Bridge is a type of curling movable bridge completed in 2004 as part of the Grand Union Canal office and retail development project at Paddington Basin, London. Despite the connotation of its name, it is more accurately described as ""curling"". The Rolling Bridge was conceived by Thomas Heatherwick. The bridge consists of eight triangular sections hinged at the walkway level and connected above by two-part links that can be collapsed towards