Archimedes' screw, 1761-1762.
© Science Museum / Science & Society Picture Library
Model, made by George Adams, instrument maker to the king, to demonstrate the working of the hydraulic screw whose invention is traditionally ascribed to Greek mathematician Archimedes (c 287-212 BC). Turning the handle at the top makes a ball travel up the helical tube. This device is still in use in many parts of the world for raising water.