Engraving by C Picarte after a painting by Sir William Beechy (1753-1839) of James Watt (1736-1819). Watt was an engineer and instrument maker who invented the modern steam engine which became the main source of power in the textile mills in Britain. His engine had a separate condenser through which steam from the cylinder was pased and cooled, allowing the engine to be kept hot. This reduced fuel consumption, saving time.
© Science Museum / Science & Society Picture Library