"If we carefully examine the... cycle of operations we easily see that they are reversible, i.e., that the transference of the given amount of caloric back again... by performing the same operations in the opposite order, requires that we expend on the piston, on the whole, as much work as was gained during the direct operations. This most important idea is due to Carnot, and from it he deduces his test of a perfect engine, or one which yields from the transference of a given quantity of caloric from one body to another (each being at a given temperature) the greatest possible amount of work. And the test is simply that the cycle of operations must be reversible."
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Nicolas Léonard Sadi Carnot
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