James Watt
1736–1819 · Scottish · Industrial Revolution
Known for: Improved the steam engine with the separate condenser, powering the Industrial Revolution
James Watt didn't invent the steam engine—he made it work. His separate condenser prevented the wasteful heating and cooling of the cylinder, making the steam engine efficient enough to power the Industrial Revolution.
He was a skilled instrument maker who partnered with Matthew Boulton, who provided the business acumen Watt lacked. The unit of power—the watt—is named after him.
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