The hydraulic automatic of Pan and of the thirsty dragon or deer

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The hydraulic automatic of Pan
and of the thirsty dragon or deer


A reconstruction of the conception of Philon of Byzantium representing a dragon or a deer that drinks water with great hunger and roars only when Pan dislikes it. When Pan turns, the dragon relaxes. The theme is repeated constantly.

Description of operation: Water from a source is driven inside the airtight intermediate container forcing air to leave towards the built-in tube of the dragon or the deer giving a roaring impression. Then when the water level exceeds the axial siphon, it empties through it to the lower container therefore, because of the pressure created by the vacancy of the vessel, the tube incorporated in the deer sips water and air giving the drinking impression. If Pan turns to the deer, water from the source is driven by rotating horizontal pipe directly towards the lower container and the phenomenon stops.

SOURCES: ''Heron of Alexandria, Pneumatics, A30'', ''Philon of Byzantium, Pneumatics, 59''