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c.270BC

The float that invented automatic control

In Alexandria, a float valve starts keeping the water level in clocks constant: when the level drops, it opens; when it rises, it closes. Attributed to Ctesibius, it is considered the first known feedback mechanism, the same principle that today keeps a robot on its feet.

Source: Wikipedia, Feedback

Water clock from the reign of Ptolemy II (285–246 BC), from the time of Ctesibius. Oriental Institute, Chicago.
Water clock from the reign of Ptolemy II (285–246 BC), from the time of Ctesibius. Oriental Institute, Chicago. CC0

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