James Watt, Scottish engineer, c 1800s.
© Science Museum / Science & Society Picture Library
Plaster copy of a bust by Sir Francis Legatt Chantrey (1781-1841) of James Watt (1736-1819). Watt was a Scottish 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.