James Watt�s workshop, 1790-1819.

ENGLAND - DECEMBER 02: A view of a reconstruction of James Watts� workshop, containing over 6,600 objects, as detailed in the inventory made by Watt himself of the contents of the private workshop at his house in Heathfield, Birmingham, where he lived from 1790 to his death in 1819. Watt was a Scottish engineer and instrument maker who invented the modern steam engine, which became the main source of power in textile mills in Britain. His engine had a separate condenser in which steam from the cylinder was passed and cooled allowing the engine to be kept hot. This reduced fuel consumption and saved time. The SI (international standard) unit of power, the watt (W), is named after him. (Photo by SSPL/Getty Images)