Invention of compass....

A compass is an instrument containing a freely suspended magnetic element which displays the direction of the horizontal component of the Earth's magnetic field at the point of observation. The magnetic compass is an old chinese invention, probably first made in China.Chinese fortune tellers used lodestone (a mineral composed of an iron oxide which aligns itself in a north-south direction) to construct their fortune telling boards.Eventually someone noticed that the lodestones were better at pointing out real directions, leading to the first compasses. They designed the compass on a square slab which had markings for the cardinal points and the constellations. The pointing needle was a lodestone spoon-shaped device, with a handle that would always point south.