But around the first century BC, it was seen that a horizontal water-mill could be used with a gear to carry water vertically (two later inventions)


Vitelowis first introduced us to gears when describing the vertical wheel, end gear, and "lantern" used to drive the mill.

The spread of the water mill

Slower than horizontal, but in the early Middle Ages, at least in the low Countries of Europe and some of the densely populated parts of the Muslim world,

It is a common way to grind flour.

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