The Oliviers formed a partnership with Pierre Michaux to mass-produce a 2-wheeled velocipede. The freewheel of the Svea Velocipede was patented in 1892. In 1821, Gompertz invented an improved velocipede, an early form of bicycle. Roper's velocipede of the late 1860s used a similar two way twistgrip handlebar control. Thomas Humber made himself a velocipede in 1868. The most common type of velocipede today is the bicycle. The basement includes an extensive display of historic bicycles that includes Draisine and Velocipede models. Along with the Roper steam velocipede, it might have been the first motorcycle. This came to be known as a "railway velocipede" or "railroad velocipede". He held patents from 1869 for a velocipede and 1874 for a gas governor. The name is a compound word composed of "velocipede" and "dog". The engine weighed , and the total weight of the steam velocipede was . The earliest example is the French Michaux-Perreaux steam velocipede of 1868. However, that fails to explain what the velocipede of ingenious design was.