What did the spinning metal balls of a centrifugal governor do on a steam engine?
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Two heavy balls spin on hinged arms. The faster the engine runs, the further they swing outwards, and their arms close the steam valve a little; when the engine slows, the balls drop and open it again. The engine holds its own speed without anyone watching it - the first feedback loop in widespread use, and the ancestor of the thermostat and cruise control.
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Source: Wikipedia (CC BY-SA)
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