Horsepower Milestones: A Seldom-Told Story of Oft-Cited Figures

At the end of the 18th century, James Watt and other steam-engine makers needed a means of rating their machinery?s capacity for work. Based on its faithful service as a power provider, the horse was deemed the logical yardstick. Experiments revealed that a typical draft horse could turn a 24-foot-diameter millstone 2.4 rotations in one [...]

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