In 1975, I could be found tooling around Portsmouth in my 1959 red Cadillac Sedan de Ville. It was a great car with a four-barrel carb, dual exhausts and a powerful V-8 engine and more than 300 horsies under the hood. Or so I told people. When I shared that statistic, people would cock their head a little and look at me funny. (That has happened to me a lot in this life…)

And then I’d tell them that it was a 390-cubic inch engine which produced about 330 horsepower.

Mechanically speaking, one horsepower equals the amount of effort needed to move 33,000 foot-pounds per minute, or (in simpler terms) the ability to lift 33,000 pounds one foot in one minute’s time. When used as a measure for electric motors, one horsepower equals about 746 watts. The term “horsepower” was coined by James Watt. He was an 18th Century genius who is credited with significant innovations to the steam engine, making it useful, affordable and practical. The historians say that Watt’s inventions and innovations transformed America from an agricultural society to an industrial society.

There’s a reason our old expressions developed the way they did. Back in the day, stage coaches often had six horsepower, with the six sinewy animals straining at the reins to pull the carriage down the dirt roads. Or, as in the case of the 1905 advertisement shown below, the most modern concrete mixers of the day had ONE horsepower.

BTW, there’s a significant problem with this advertisement. There’s no legal disclaimer at the bottom that says, “Horsie not included.”

one-horse powered cement mixer

Closer look at the one-horsepower concrete mixer