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[[top image: strange schematic drawing of a two-man water pumping system.  The dark area inside the container is the water chamber. The left pumping arm drives the bellows in the chamber, and the right pumping arm may be a siphon pumping water from below the device, but probably just a guide.  Valves, square flappers on the boxy structures are shown open.  As the lever is moved upward it draws the bellows upward pushing the water against the upper valve closing it, and sucking the bottom valve shut.  When the lever and bellows are at the top and starting down, the top valve opens water fills the chamber for the next stroke, and water is forced out the bottom valve.  The valves are probably purely schematic and are more likely to be arranged side-by-side as in the left image below]]

[[left image: this internal end view shows the two sets of valves located at the right end of the device, operating as follows: when the two valves on the left are forced closed by the water pressure on that side, the valves on the right will open and water flow outward, and vice-versa]]

[[bottom right image: appears to be top view of the device (cross at center is the base of the pump arms, and the slide device moves as the rod driving the bellows moves back and forth as the pump arm goes up and down]]

Transcription Notes:
mandc: this is a pure guess as the drawings are oddly drawn in semi-three-dimension. But looks like an early two-man pump.