Lenoir Patents First Internal Combustion Two-Stroke Engine

By 1859, Lenoir's experimentation with electricity led him to develop the first internal combustion engine, a single-cylinder two-stroke engine which burnt a mixture of coal gas and air ignited by a "jumping spark" ignition system by Ruhmkorff coil, and which he patented in 1860. The engine differed from more modern two-stroke engines in that the charge was not compressed before ignition (a system invented in 1801 by Lebon D'Humberstein, which was quiet but inefficient), with a power stroke at each end of the cylinder. In 1863 the Hippomobile with a hydrogen gas fuelled one cylinder internal combustion engine made a test drive from Paris to Joinville-le-Pont: top speed about 9 km in ~3 hours.