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Old mill in Sweden

A grist mill grinds grain into flour. Most old ones are watermills. They have a waterwheel and 2 stones for grinding. Water pushes the wheel causing it to spin. This movement causes an axle inside to turn. The axle is connected to a gear which causes the grinding stones to spin. At the top, there is a chute filled with grain. The grain slowly falls through into the grinding stones.

Some old grist mills are windmills.