A cylinder with a hose (which hangs down into a pail of water) sitting on a table.

A leveled cylinder is filled with water, covered by a lid, and left standing for several days. Attached to the small hole at the center of the cylinder is a hose (also filled with water and stopped by a rubber bung) which hangs down into a pail of water. On releasing the bung the water flows out and, according to theory, should acquire a spin which has the same sense as that of the Earth. (Courtesy of Prof. John Marshall.)