Pump for drawing water from a well; perpetual-motion screw
A valve-and-piston well pump, with a note on a screw of 8 turns and 8 spokes.
At the top is a device labelled A for drawing water from a well: a part m holds a valve c open until it fills, then, as m descends, c is stopped while a piston S rises and draws the well-water up behind it. A second note, set diagonally beside further sketches of screws, instructs that the screw A be made with 8 whole turns and 8 spokes for perpetual motion. The pen sketches show Archimedean-type screws and coiled forms.
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Valve-and-piston device for drawing water from a well
In the instrument labelled A, the part m keeps the valve c unstopped until it fills; when m departs the valve c is stopped. As m comes down, the piston S goes up and draws the well-water up behind it.
Perpetual-motion screw of 8 turns and 8 spokes
Set diagonally beside three figures for perpetual motion, the note specifies that the screw A be made with 8 whole turns and 8 spokes.