A mill that is powered by men or animals walking on a circular belt or climbing steps.
1Transportation, the tread-wheel, or a public whipping, would perhaps be sufficient.
2He proposed that the tread-wheel should measure the progress of the culprit, and that every revolution should bring him nearer to liberty.
3The tread-wheel had been the mode in his time; so by the time he had made three thousand turns he was rather exhausted.
4The building was open to the roof, and the first thing to be seen in it was that tread-wheel of which Elzevir had spoken.
5"The horse on the tread-wheel can look through a crack, and see a flower growing outside."