One of the 200 exceptional ancient Greek inventions (from the robot - servant of Philon to the cinema of Heron)
It was an hydraulic alarm clock, invented by Plato.
The upper ceramic vessel supplied the next vessel with water through a tap. When the second vessel was full at the programmed moment (i.e. 8, 12 hours), it emptied quickly through an axial siphon t the next airtight vessel and forced the contained air to come out with pressure, whistling through a syringe at its top.
Because the flute led to water, the vibrating sound length, produced a chirp with notes of different frequency.
After its operation, the third vessel emptied slowly (through a small hole located at its boottom) to the lower storage vessel in order to be reused.
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