The first successful bicycle to incorporate a frame designed on scientific principles. To obtain the maximum amount of lateral rigidity Mr Pedersen designed his cycle frame in a series of triangles, each angle so arranged as to have the principal stresses induced absorbed at its apex. The various duplicated small-diameter tubes give the whole frame structure an increased torsional stiffness, and all joints are brazed to increase frame rigidity. The long steering head and front forks form a kind of girder and turn about two widely spaced pivots. The result is that all tubular members in the triangulated frame are subjected only to compression stress. The frame weighs only 14lb (6.4 Kg). The Dursley-Pedersen is one of the most comfortable and easy-to-ride bicycles so far con structed (this was written in 1966). The string hammock type saddle is suspended between two apices of the triangular frame and its tension may be varied to suit the rider. Both wheels are of the same diameter and fitted with pneumatic tyres. Rim brakes operated by Bowden type levers and cables, full mudguards, pump, belt, lamp bracket and a mounting step are fitted. Later models of the Dursley-Pedersen bicycle had three-speed gears, were superbly finished, and were regarded as one of the more luxurious bicycles available during the Edwardian era.