Originally from Thomson, W. (1849). "An Account of Carnot's Theory of the Motive Power of Heat; with Numerical Results deduced from Regnault's Experiments on Steam". Transactions of the Royal Society of Edinburgh 16 (part V): page 546. doi:10.1017/s0080456800022481
also in
Carnot, Sadi; Thomson, William; Thurston, Robert Henry (editor and translator) (1890). Reflections on the Motive Power of Heat. New York: J. Wiley & Sons. page 142
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