a roman water pump

a roman water pump

This ancient roman water pump has two inlets at the bottom and two pistons which worked in alternation: as piston A pushed down into its chamber full of water, water went up and out of the spout at the top. The pressure shut the valves at Piston B which would be drawing more water in as it withdraws from the chamber. Piston B would then start to push back into its chamber full of water etc.

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