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James Watt (19 January 1736 – 25 August 1819) was a Scottish mathematician and engineer. He did not invent the first steam engine, but he did modify it to work better. There were other patented steam engines (such as the Savery and Newcomen steam engines) in use by the time Watt started his work on them. His major contribution is in developing the modern form of the steam engine. The Watt steam engine is credited for driving the Industrial Revolution of the 18th and 19th centuries. James Watt was a brilliant engineer and he also transformed the Newcomen engine.
The modern unit of power, the watt, is named after him. It replaced the horsepower invented by Watt.