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A simple windmill consists of a vertical post with two rotating hubs - one vertical, one horizontal - attached at the top. Each hub is attached to the other, allowing the windmill to rotate horizontally and point into the wind. The vertical hub has slats attached radially to it, each one at a slight angle. As the wind passes over the slats, the Bernoulli principle (high pressure/low pressure) causes the vertical hub to rotate. By itself, a windmill is just decorative, but if big enough, it can be used to rotate grist stones in mills, run pumps, etc.

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13y ago

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