Nautical Brass Wheel Compass
Compass is an instrument for navigation and orientation. It has a magnetic needle or a card that can rotate freely and if positioned horizontally it will align itself with magnetic field of the Earth and point Magnetic North-South. At first, it was used for divination, fortune-telling and geomancy, for finding precious gems and in feng shui but in time people found that it can be used for navigation and orientation. People knew about magnetite even before then but it took centuries for it to get at least some purpose.
"We are dealing in bulk quantity."