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The steam-engine was developed by many engineers, but once established it was subject simply to further improvements in efficiency. Power output is a factor of the purpose for which an engine is designed, so no-one "invented a more powerful steam engine". If you mean "who made the largest contribution to developing the steam engine", then that must be James Watt, who was the first to analyse how the machine actually works and how to overcome the largest inefficiencies in the engines built at the time, which were solely for operating mine-drainage pumps. Watt also invented the Sun-&-Planet drive to allow the engines which hitherto had been purely reciprocating in action, to revolve drive-shafts (the crank had been invented but patented by someone else - sorry, I forget who!). He is credited with the first type of engine-indicator, used to measure the pressure-cycle in the cylinder hence calculate the power developed within the cylinder, and the thermal efficiency of the machine - important in improving fuel consumption. Watt also devised from numerous experiments the horse-power as a measure of power, so customers of his company, Boulton & Watt, could assess the machines they needed for their purposes, which at that time chiefly driving factory machinery. The international standard unit of power is the Watt, in James Watt's honour, and 1Watt = 1Joule/second conversion of energy. One HP = 746 W - in practice 750 is usually close enough. So no-one invented a "more powerful" engine, but many invented improvements and variations.

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Q: Who invented a more powerful steam engine?
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