Treadmill
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A treadmill is a device generally used for walking, running, or climbing while staying in the same place. Treadmills were introduced before the development of powered machines to harness the power of
Example of modern treadmill
Horses powering a threshing mill
Treadmill used to punish prisoners at Breakwater Prison, Cape Town
Treadmill test at the medical center of the Olympic village at the 1980 Summer Olympics
Treadwheel
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A treadwheel, or treadmill, is a form of engine typically powered by humans. It may resemble a water wheel in appearance, and can be worked either by a human treading paddles set into its circumferenc
Treadmill
…of powered machines to harness the power of animals or humans to do work, often a type of mill operated by a person or animal treading the steps of a treadwheel to grind grain. In later times, treadmills were used as punishment devices for people sentenced to hard labour in prisons. The terms treadmill and…
British penal treadwheel
Roman drainage treadwheel from Rio Tinto mines, Spain