What rotating device did Leonardo da Vinci propose to lift water from a well?

Leonardo da Vinci proposed a water-raising screw for lifting water from a well.

His notebooks contain studies of screw-shaped mechanisms that could move water upward as the screw rotated. The underlying principle is associated with the Archimedes’ screw, an ancient device traditionally attributed to Archimedes of Syracuse. Leonardo did not originate that ancient invention; he analyzed and adapted screw mechanisms during his investigations of machines and hydraulics.

A helical surface inside a tube or trough traps water and carries it upward during rotation. The device is especially useful for irrigation, drainage, and raising water to a higher level.

This subject is often misidentified as one of Leonardo’s original inventions. His importance here lies in his detailed mechanical studies and proposed applications, not in inventing the basic water screw.