These are the kind of horses that gave horsepower its name. When James Watt was doing his experiments to determine the power of horses he was measuring the performance of horses that raised coal at a mine. Unless the mine had two separate stocks of horses, for above ground and for below ground, they were all pit ponies. He added 50% to his result to define the Horsepower, the traditional unit of power. The British Imperial Horsepower is equivalent to 746 Watts - the metric Horsepower unit is slightly different. It seems likely that the horses Watt measured were smaller than these Friesians, which I estimate to have a power approaching the 746 Watts of the standard British Horsepower.
Microsoft's Encarta has some information on Watt's experiments on the power of horses.
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