Beginning of Essay
A bicycle is a two-wheeled, steerable machine propelled by its rider; the bicycle is said to be the most efficient means yet devised to convert human energy into propulsion. First made in the early 19th century, it developed as an important means of transportatio ....

Middle of Essay
.... day super-light- weight machines. Most written sources agree that the first bicycle was introduced around 1817 by a man called Von Drais. This wooden two-wheeled vehicle that weighed some 45kg (100 lbs). It comprised of a wooden beam structure, straddled by the rider, with a fixed wooden rear wheel and a steerable wheel in front, controlled over a tiller mechanism. It was propelled by pushing off with the legs, rolling along between these propulsive pushes. (fig 1) page 14 von drais 1817. Despite the technical and visual development the bicycle has undergone in the years since, the basic concept is clearly present in Von Drais’ invention, and ....