Francis Edgar Stanley and Freelan O. Stanley

Francis Edgar Stanley and Freelan O. Stanley were American inventors, twin brothers, and the most famous manufacturers of steam-driven automobiles.

In 1883 Francis Stanley invented a photographic dry-plate process, and together the brothers began to manufacture the plates. In 1897 they began developing their steam-powered cars, and their company, the Stanley Motor Company, continued building Stanley Steamers until the 1920s. They competed in racing events from 1902 to 1909, frequently beating larger, gasoline-powered cars. In 1906 the brothers built a steam car that set a world’s record that year for the fastest mile—28.2 seconds, corresponding to a speed of more than 127 miles (205 km) per hour.