Windmills
Windmills were invented around 700, brought to France from Persia. Unlike water wheels, didn't require a river. First they had to be turned manually to face the wind, later the wind itself caused the mill to face it.
Windmills were invented around 700, brought to France from Persia. Unlike water wheels, didn't require a river. First they had to be turned manually to face the wind, later the wind itself caused the mill to face it.