Application and usage of compass What is the purpose of compass and how to use it?

1. Compass is an important instrument, which is widely used in astronomy, geography, military affairs, navigation and divination, as well as the location of houses and graves. It is the continuation and development of the compass, one of the four great inventions in ancient China. It is a traditional practical folk handicraft developed on the basis of the compass.

2. When fixing a point, the first thing to do is to measure the position of the observation point in a certain terrain or feature.

3. When measuring, open the compass cover, loosen the brake screw and let the magnetic needle rotate freely.

4. When the measured object is high, put the compass on the chest, aim the long horizontal direction of the compass at the measured object, and then rotate the reflector to make both the object and the long sight reflected in the reflector. The tip of the object, the short sight on the long sight and the center line of the reflector are in a straight line, while keeping the compass horizontal.

5. When the magnetic needle stops swinging, you can directly read the reading on the circular dial pointed by the magnetic needle, or press the brake screw to read it again.