Involute Gear
Part of the album: Bridges and Windmills of Bruges
Windmills sit on a rotating base to be able to turn to face the wind. This winch was attached to the windmill and you would tie a cable around a post in the ground (these posts were every 30 degrees in the ground). When you winched the cable, t would pull rotate the windmill in the direction of the fixed post in the ground.
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