James Watt 2019さんのイラストまとめ
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Celebrating the 250th anniversary of James Watt's patent (to use a separate condenser to improve the steam engine) and the 200th anniversary of Watt's death.
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otd
#OTD 25 August 1819 James Watt died at his home at Heathfield, Birmingham - next year there will a series of events across the UK marking his Bicentenary, & also the 250th anniversary of his 1769 patent for the condensing engine
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