England Plus Paris: Part 12: Diagram: water wheels draining a mine

Romans had mines, which they drained using water wheels. Part of one of their old waterwheels survived. The interpretive "text" included a diagram showing how a mine was drained by means of many of these wheels. Each wheel was worked by a slave as a treadmill. That must have been a great job: walking a treadmill in water in a deep hole in the ground.

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