How do ancient windmills work?
ancient meaning windmills without generators for them to work. Windmills that grind grains, pump water and saw wood.
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The wind turns the vanes (the things that look like propellers) and the shaft for that is connected via gears to a grindstone or turns the shaft of a wheel. The wheel would be connect to a rod that moves up and down and moves a piston to pump water of moves a saw blade to saw wood.