What Leonardo da Vinci machine used a screw conveyor to move material continuously?

Leonardo da Vinci studied Archimedes’ screw as a machine for moving material continuously.

An Archimedes’ screw consists of a helical surface inside a cylinder or wrapped around a shaft. When the screw rotates, water or loose material is carried upward along the spiral. Leonardo examined and drew screw mechanisms as part of his broader work on hydraulics, engineering, and the movement of fluids.

The underlying invention was ancient, not Leonardo’s original creation. It is traditionally associated with Archimedes of Syracuse, who lived in the third century BCE. Leonardo’s contribution was to study, depict, and adapt mechanical principles in Renaissance engineering rather than to invent the ancient screw himself.

The machine is often described only as a water pump, but screw conveyors can also move grain, soil, and other bulk materials. That distinction matters because Leonardo’s notebooks explore mechanical transport broadly. The screw’s continuous action also contrasts with bucket devices that lift discrete loads one container at a time.