Note 39 — Chapter III · THE PRESENT PHYSICAL UNIVERSE.
Reading edition
They virtually showed that in a perfect steam-engine with pressure equal to ‘one atmosphere’ in its boiler, and with its condenser at the temperature of melting ice, the ratio of the heat taken in to the heat given out is 1·365 to 1. Hence if the difference between the numbers is to be 100, these must be 374, 274.—Phil. Trans., 1854.