In the United States, a unit of power = one pound of water at 100°F evaporated into steam of 70 pounds per square inch, about 1110.2 Btu. 30 kals per hour = 1 commercial boiler horsepower.
Latimer Clark.
A Dictionary of Metric and Other Useful Measures.
London: E & F.N. Spon, 1891.
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