Engineers use the resulting diagram to check the design and performance of the engine. This is a replica of the original steam indicator invented in the late 18th Century by James Watt of Scotland.

Scientists create "the world's smallest steam engine" By James Holloway December 15, 2011 Principle of the microscopic engine (Diagram: University of Stuttgart) View 1 Images ...

At 180 horsepower and peak torque of 850 pound-feet--at 1 rpm--the engine promises to deliver a steam-powered speed record with a marriage of old and new technology.

Miscellany Published: 30 November 1929 Steam and other Engines Nature 124, 834–835 (1929) Cite this article ...