HorsepowerA measure of force. Watt estimated the “force” of a London drayhorse, working eight hours a day, at 33,000 footpounds (q.v.) per minute. In calculating the horsepower of a steamengine the following is the formula: times A times L times N33,000 deduct 10 for friction. P, pressure (in lbs.) per sq. inch on the piston. A, area (in inches) of the piston. L, length (in feet) of the stroke. N, number of strokes per minute. Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894 More on Horsepower from Fact Monster:

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