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Newcomen installs his first commercial engine
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James Watt invents the seperate condensor, the key being to relocate the water jet, works as a boiler.
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First rotated engine, driving a fly wheel by means of the sun and planet gear rather than crank
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Watt builts his first "double acting" engine - a cylinder in which the working fluid acts alternately on both sides of the piston - common in steam engines
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An improved cylinder
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Nathan Read invented these
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Richard Trevithick builts his first high pressure engine
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John Steel built Locomotive model