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> > How do you measure the power of an engine? Horse-power, right? Yet, an
> > engine is by no means composed of the same substance as a horse.
> > Yeah, I know, that's probably not a good example.
> Horses are flesh and blood and engines are metal, but they also have
> one common substance, namely the ability to perform work (in the
> sense) measured by time, mass and distance (if I recall correctly).
Watt introduced a purely notional horse into the measurement. He posited a
able to lift 3390lbs through a distance of 1 foot in a minute.
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