A screw-like device which can be used to raise water from a lower level to a higher one by turning a handle. The device is still used today, and is purported to have been invented by Archimedes. Eric Weisstein's World of Biography
References
Pappas, T. "The Screw of Archimedes." The Joy of Mathematics. San Carlos, CA: Wide World Publ./Tetra, p. 198, 1989.
