What kind of machine did Leonardo da Vinci sketch for producing a continuous supply of water from a well?

Leonardo da Vinci sketched a water-lifting screw for raising water continuously from a lower level.

The mechanism used a helical surface inside a tube or cylinder. As the screw turned, pockets of water were carried upward along the spiral and discharged at a higher point. Leonardo studied screw-based water machines as part of his broader investigations of hydraulics, irrigation, and mechanical power.

This principle is commonly known as the Archimedes’ screw, after the ancient Greek engineer traditionally associated with it. Leonardo therefore did not invent the underlying machine. His importance lies in studying, drawing, and adapting established mechanisms for Renaissance engineering problems.

A water-lifting screw is different from a modern piston pump, which uses reciprocating motion and valves. It is also distinct from a bucket wheel, whose containers raise water around a wheel. Leonardo’s sketches demonstrate how he combined ancient technical ideas with detailed mechanical analysis and new applications.