Water clocks, known as a clepsydra in Ancient Greece, were widespread for centuries, and the philosopher Plato is credited with first adapting one into an alarm in the 5th Century BC. He trapped air inside a vessel which water was flowing into; as the water increased so did the pressure, eventually resulting in a loud kettle-like whistle. Water clocks were also some of the earliest automated village bells, notes Champion. They used large basins of water which when drained would lead to the striking of a bell – one 12th Century chronicle records such a water reservoir being used to put out a fire.
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