Here, he shows off what makes them run: six tiny, functional engines. The single cylinder double-acting engine is especially impressive. Sometimes the best way to make an engine tiny is to change ...

a double-acting) rotative steam engine that, along with Watt's signature separate condenser, featured a parallel motion mechanism that doubled the power of the existing steam cylinder. The Boulton ...

Stanley Steamers use a fire-tube boiler to power the double-acting two-cylinder engine; they outsell gas vehicles from 1899 to 1905. The Doble Model C steam car debuts at the National Automobile Show.

Then, by introducing steam both above and below the piston in the cylinder, he made it into a double-acting engine, so that the piston produced useful work with both strokes. His engines were ...

And with the same 23-inch boiler just behind the front wheels and the same four-by-five-inch, two-cylinder, double-acting engine lying horizontally ahead of the rear axle, performance suffered.

In 1776, he built an engine with a cylinder of 127 cm diameter to pump water at Bloomfield Colliery. The final version of the new Watt engine worked in 1778. In 1782 Watt made his double-acting engine ...