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Heron's Fountain is a mind bending hydrodynamic mechanism. It appears to be perpetual motion but it fact it's a really clever mix of pneumatics and hydraulics. This 2D presentation helps to explain how it works.
Image credits:
Soxhlet extractor image - Vivi! (commons.wikimedia.org/wiki/Fi...)
Washout toilet - Flammingo (commons.wikimedia.org/wiki/Fi...)
Toilet diagrams - SouthHamsian (en.wikipedia.org/wiki/File:Fo...)
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