> And the large wooden ones in your country which often seem to 
> have 4 blades.

Yep

and greek/spanish-type windmills, and most other old designs.

> I understand they were also used for grinding grain and 
> pumping water (a useful thing to be good at when you live 
> below sea level).

Slowly rotating is good for just about everything, except the one thing
most current mills are designed for: generating electricity.

Wouter van Ooijen

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