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The first automobile

The first automobile to carry passengers was built by the British inventor Richard Trevithick in 1801 In December of that year, Trevithick conducted a successful road test of his vehicle, which carried several passengers, on an open road near his native town, Illogan. His success was due to the greater efficiency and smaller size of his power unit, which was the first to have the piston moved by steam at high pressure. Earlier power units had pistons that moved as a result of atmospheric pressure against the vacuum produced by the condensation of steam. The quantity of water required for this condensation necessarily precluded the use of these earlier engines for vehicles. Their bulk and weight relative to the power developed, moreover, were such that they could not have moved themselves if mounted on a vehicle. Later, Trevithick successfully embodied his power plant in a locomotive for rails. He is considered the founder of both road and rail automotive transportation.