The origins of gears can be traced back to the Ptolemaic dynasty of Ancient Egypt in the second and third centuries BC.

The origins of gears can be traced back to the Ptolemaic dynasty of Ancient Egypt in the second and third centuries BC.At that time, the face gear or bevel gear is usually used for driving

A like

A very rough pinion assembly like a lantern;The pinion assembly is a pair of simple rings connected by a slatted cage or grid cage

The two ends are loosened by the gears

In Europe, Asia, and Africa, geared water fetching devices were used everywhere, and for many centuries, many villages had only one

A set of gears.

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)

Combine;

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.