What is TREAD-MILL, or TREAD-WHEEL,?

is an instrument of prison discipline, being a wheel or cylinder with an horizontal axis, having steps attached to it, up which the prisoners walk, and thus put the axis in mo- tion. The men hold on by a fixed rail, and, as their weight presses down the step upon which they tread, they ascend the next step, and thus drive the wheel. Enc. Brit.

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