Penny-farthing
The penny-farthing is an early model of bicycle, produced in England in 1870. The two wheels are of disproportionate size: the front much larger than the rear. It is this that gave rise to the name: the English penny coin of the late 19th century was very large compared to the small farthing. The official name of the penny-farthing is the Ordinary bicycle.Before the development of a gear system to multiply the revolutions of the pedals, these were linked directly to the wheel. Thus to increase the maximum speed, the driven wheel at the front was enlarged. The position of the rider was moved so he was sitting directly above the wheel, so it could be enlarged to its maximum limit, given by the length of the rider's legs.
This meant that the rider's feet could not reach the ground while riding, and the penny-farthing was notorious for causing accidents. It is effectively little more than a unicycle with an extra wheel for stability.
By the 1890s, the modern bicycle (known originally as the Safety bicycle due to its great safety improvements over the penny-farthing) had become established, and penny-farthings are nowadays only museum pieces or kept by hobbyists.
Trivia
A penny-farthing made several appearances in the cult 1960s television series The Prisoner, and was even featured in the show's closing titles.
Progressive rock band Arena's album The Visitor features a man on a penny-farthing in its cover artwork.
The penny-farthing has made couple of appearances on The Simpsons, one on a flyer for a box social proposed by Homer Simpson and, after Homer confesses to hating and vandalising "old-timey bicycles" on public access TV, he's kicked in the face by a man riding on a penny-farthing.