Engines of Our Ingenuity

No. 374:
PRISON TREADMILLS

by John H. Lienhard

Click here for audio of Episode 374.

Today, America shies away from a strange prison reform. The University of Houston's College of Engineering presents this series about the machines that make our civilization run, and the people whose ingenuity created them.

Prisons are strange places. Are they meant to punish? Are they meant to reform? Or are they merely meant to keep criminals out of our hair for a season? That question rides upon a curious 19th-century machine, the prison treadmill.

Treadmills have been around since antiquity. They let us use our lower body muscles to power pumps and mills. Treadmills came into English jails following a 1779 prison reform act. That act said that prisoners should be given

... labor of the hardest and most servile kind in which drudgery is chiefly required and where the work is little liable to be spoiled by ignorance, neglect, or obstinacy ...
That worked well enough in the boom economy of the early Industrial Revolution. But England had out-of-work laborers on her hands after the Napoleonic Wars. She could hardly let convicts take jobs, no matter how menial, away from citizens.

Then Sir William Cubitt, a noted 19th-century civil engineer, offered a solution. He designed a treadmill for English prisons. It's aim was to generate power for mills. It looked like a very wide paddle wheel. Workers held on to a bar and climbed the paddle blades. It was like walking upstairs for hours on end. They had to keep lifting their legs. Gravity gave them no choice.

A typical treadmill shift lasted eight hours. Workers spent 40 percent of that time resting. That's a lot worse than it sounds. It meant raising the lower half of their bodies 11,000 feet per day. And yet, hard as it was, 200 men and women could hardly match the output of one water wheel.

The English put vertical separators between prisoners in 1838. Each was to labor in isolation, repenting his crimes and purifying himself through toil. Those treadmills were still operating in this century. Oscar Wilde, sent to prison for gross indecency in 1895, worked on one. When he came out, he wrote about it in the Ballad of Reading Gaol.

We banged the tins, and bawled the hymns
And sweated on the mill,
But in the heart of every man
Terror was lying still.
19th-century America tried treadmills, but they didn't catch on. For a while Charleston slave-owners could rent one to punish runaway slaves. But labor was too precious to waste that way in an expanding land. We preferred to let prisoners do ugly jobs that had some purpose -- picking cotton, or breaking rock.

Cubitt's treadmill may have originally had a productive purpose. But a pound of coal could soon do the work of five men working all day on a treadmill. And labor-wasting was a serious crime in its own right, in the mind of 19th-century America.

I'm John Lienhard, at the University of Houston, where we're interested in the way inventive minds work.

(Theme music)


Shayt, D.H., Stairway to Redemption: America's Encounter with the British Prison Treadmill. Technology and Culture, Vol. 30, No. 4, 1989, pp. 908-938.



Image courtesy of Larry Witte

A typical power-producing treadmill as pictured in The Operative Mechanic and British Machinist, 1831



The Engines of Our Ingenuity is Copyright © 1988-1997 by John H. Lienhard.

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