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James WattIn science, James Watt (1736-1819) was a Scottish instrument maker and engineer notable for number of inventions and design improvements to the functionality of the steam engine, including the fly-ball governor, designed to regulate the supply of steam to cylinder of an engine, the indicator (1796) and "indicator diagram", made with his employee John Southern, which tracked the changes in volume of the piston, the definition of "pony power" (or horse power), and the design of a steam engine having a separate condenser. Watt’s indicator diagrams were later utilized by French engineer Émile Clapeyron to graphically analyze the work output during a Carnot cycle. A significant mentor, and later lifelong friend, was Scottish physicist and chemist Joseph Black. [1]

References
1. Sproule, Anna. (2001). James Watt – Master of the Steam Engine. Woodbridge, Conn.: Blackbirch Press, Inc.

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