Watt patents the rotative steam engine
- Date
- 1781
- Category
- Science, technology & invention
- Region
- United Kingdom (Birmingham and the English Midlands)
- Era
- Early Modern
- Significance
Building on his 1769 separate-condenser patent, James Watt, in partnership with the Birmingham manufacturer Matthew Boulton, introduced in 1781 a steam engine capable of producing continuous rotary motion through his 'sun-and-planet' gearing.
Earlier Newcomen and Watt engines had supplied only the reciprocating up-and-down stroke useful for pumping water from mines. Rotary motion meant steam could now drive the shafts, belts and machinery of cotton mills, flour mills, breweries and ironworks, freeing manufacturers from dependence on water power and fixed riverside sites. Watt's engine consumed roughly three-quarters less fuel than a comparable Newcomen engine, making large-scale mechanised production economically viable. Boulton and Watt manufactured and sold close to 500 engines before their core patents lapsed in 1800. The rotative engine is widely regarded as a pivotal enabling technology of the Industrial Revolution, decoupling industrial output from the limits of muscle, wind and water and underpinning the rise of the steam-powered factory, the railway and, eventually, the steamship.
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Empires active in 1781
- Qing Dynasty1636 CE – 1912 CE
- British Empire1583 CE – 1997 CE
- Russian Empire1721 CE – 1917 CE
- Spanish Empire1492 CE – 1976 CE
- Portuguese Empire1415 CE – 1999 CE
- Mughal Empire1526 CE – 1857 CE
Related science, technology & invention events
- Edward Jenner Develops Smallpox Vaccination14 May 1796
- Newton's Principia and universal gravitation1687
- Publication of Kaitai Shinsho, launching Rangaku in Japan1774
- Arkwright's Cromford Mill and the birth of the factory system1771 (water frame patented 1769)
- Sawai Jai Singh II builds the Jantar Mantar observatoriesc. 1724
- Variolation against smallpox reaches Europe1721
Further reading
The wider story
A Little History of Science
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