A mill that is powered by men or animals walking on a circular belt or climbing steps.
1 Transportation, the tread - wheel , or a public whipping, would perhaps be sufficient.
2 He proposed that the tread - wheel should measure the progress of the culprit, and that every revolution should bring him nearer to liberty.
3 The tread - wheel had been the mode in his time; so by the time he had made three thousand turns he was rather exhausted.
4 The 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."
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