Mechanical governor device.

Circular Motion: The Governor Apparatus. In the Governor Apparatus shown, point A is not free to move up and down. The collar at C is free to move up and down, and the steel spheres at B can swing up and out. As the handle is rotated, the Governor rotates; the spheres at B rise up and out; the collar at C rises up, and the handle at D lowers and can be used to regulate other devices.
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