Others before Corliss had at least part of this idea, including Zachariah Allen, who patented variable cut off, but lack of demand, increased cost and complexity and poorly developed machining technology delayed introduction until Corliss.
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The first piston steam engine, developed by Thomas Newcomen around 1710, was slightly over one half percent (0.5%) efficient.
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Drawing on all the previous work led Sadi Carnot, the "father of thermodynamics", to publish Reflections on the Motive Power of Fire (1824), a discourse on heat, power, energy and engine efficiency.