James Watt calculated horsepower by measuring the output of an actual horse in order to quantify how many horses his steam engines could replace.
Horsepower A team of six horses mowing hay in Lancaster County, Pennsylvania The development of the steam engine provided a reason to compare the output of horses with that of the engines that could replace them. In 1702, Thomas Savery wrote in The Miner’s Friend: So that an engine which will raise as much water […]