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Before the age of electric power, inventors made engines that were powered by horses. One popular device was called a horse mill. The horse was attached to a flat turning wheel. When the horses walked forward, the wheel turned. This powered the mill. The mill would pump water and grind grain.
At last count there were almost 59 million horses in the world. There are about 9.5 million living horses in the United States. More than 2.5 million of these horses are registered American Quarter Horses!
The term horsepower was created by Scottish engineer James Watt. Horsepower compares the work of an electric engine with the power of large draft horses.