What do you think of compass?

Take the compass and turn around until the red pointer coincides with the north. At this time, the southeast and northwest on the compass are the actual southeast and northwest. Then put the compass horizontally and the pointer will stop swinging, so that you can see the north-south direction accurately.

The letters on the compass stand for the East, W for the West, S for the South and N for the North. ? Compass is one of the four great inventions in ancient China, and it is a simple tool to judge the orientation. The main component is the magnetic needle installed on the shaft, which can rotate freely under the action of natural geomagnetic field and keep in the tangent direction of magnetic meridian, and the north pole of the magnetic needle points to the north pole.

compass

Compass, called Sina in ancient times, is mainly composed of magnetic needles installed on the shaft. Under the action of natural geomagnetic field, the magnetic needle can rotate freely and stay in the tangential direction of the magnetic silver meridian. The south pole of the magnetic needle points to the geographical south pole (magnetic north pole), and the direction can be distinguished by using this property. It is often used in navigation, geodesy, tourism and military affairs.

Compass is the result of China ancient working people's understanding of magnet magnetism in long-term practice. As one of four great inventions of ancient china, its invention has played an inestimable role in the development of human science, technology and civilization. In ancient China, the compass was first used for rituals, etiquette, military affairs and divination, and to determine the orientation when looking at geomantic omen.