A compass is usually a small box with a glass cover on it. A magnetized needle is pivoted inside the box. which can rotate freely. One end of this needle is north pole and another end is south pole. It also has dial with directions marked on it, the compass is kept at the place where we wish to know the direction. Its needle indicates the north south direction when it comes to rest. The com-pas is then related until the north and south marked on the dial are at the two ends.
