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Though he did not invent the steam engine, Watt made improvements to the engine.  The steam engine was invented by Thomas Savory and Thomas Newcomen.  Watts improved the engine by using a separate condensing chamber to makes run constantly and insulated it to preserve high temperature to run effectively.  He also created the pressure gauge to measure pressure and built the rotary engine for running various types of machines.  As a result, his engine was used by factories and amped up the Industrial Revolution.
James Watt was an engineer that invented the steam engine. During the industrial revolution, many of the new inventions involved power from an engine. Watt's engine allowed new inventions, such as trains, steamboats, and factories to be able to run on other means of power.