Yellow De Dion-Bouton “Popular” from 1902 with one cylinder, 6 HP, 2 speed, 340 kg, 45 km/h

De Dion-Bouton was a French automobile manufacturer and railcar manufacturer operating from 1883 to 1953. The company was founded by the Marquis Jules-Albert de Dion, Georges Bouton, and Bouton’s brother-in-law Charles Trépardoux.

By 1889, de Dion was becoming convinced the future lay in the internal combustion engine, and the company had built a ten-cylinder two-row rotary engine. After Trépardoux resigned in 1894, the company became De Dion, Bouton et Compagnie. For 1895, Bouton created a new 137 cc (8.4 cu in) one-cylinder engine with trembler coil ignition. Proving troublesome at its designed speed of 900 rpm (throwing bearings and running rough), when Bouton increased the revs, the problems vanished. In trials, it achieved an unprecedented 3500 rpm, and was usually run at 2,000 rpm, a limit imposed by its atmospheric valves and surface carburettor. Inlet and exhaust valves were overhead, and a flywheel was fitted to each end of the crankshaft.

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