Wolfmuller motor bicycle, 1894. It was the first practical motorcycle to be put on the market. Alois Wolfmüller and Hans Geisenhof's patented design (Patent No. 78553, January, 20 1894) utilized an all metal hollow tube-frame that was revolutionary for the period. The frame is formed of four horizontal tubes, between which the motor is mounted, and are united at their front ends with four inclined tubes connected at the top by crossbars carrying the steering head. The motor is a horizontal (parallel) two-cylinder, four-stroke, 1488cc engine that was water-cooled. The pistons move in unison, but ignition takes place in alternate cylinders on each out-stroke.

Image and text courtesy Science Museum Group. Licence: CC BY-NC-ND 4.0

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