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The Nuttall Encyclopedia
The unit of work of a steam-engine, being the power to raise 33,000 lbs. one foot in one minute.
Wood, James, ed. Entry for 'Horse-Power'. The Nuttall Encyclopedia. https://www.studylight.org/encyclopedias/eng/nut/h/horse-power.html. Frederick Warne & Co Ltd. London. 1900.