Correct view of compass

The correct view of the compass is as follows:

1, it is correct to hold the compass. Keep the compass level and make sure that no objects or electronic devices interfere with it. At the same time, stay away from magnetic objects (such as mobile phones and keys). ) avoid drying. ...

2, just looking for the north. The main function of compass is to help us find the north. To do this, we need to know the mark on the compass. Usually, the red mark on the compass indicates ...

3. Use nearby landmarks to determine the direction. When we find the north, we can identify other directions according to the surrounding landmarks and compasses.

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 keep in the tangential direction of magnetic 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. The invention of the compass with physical direction indication has three parts, namely Sina, compass and magnetic needle, all of which belong to the invention of China. According to ancient mine records, it first appeared in the Cishan area during the Warring States Period.

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.

history of inventions

According to ancient mine records, it first appeared in the Cishan area during the Warring States Period. The predecessor of compass is Sina, one of the four great inventions in ancient China. According to March 1982 Guangming Daily, Cishan (in present-day Wu 'an, Handan City, Hebei Province) is the birthplace of the compass, one of the four great inventions in China. According to ancient mine records, Geography of Ming Dynasty said: "There is a magnetic mountain in the southwest of Wu 'an County, Cizhou, which produces magnetite. "

The Ming Yi Award also said: "There is a magnetic mountain in the southwest of Wu 'an County, Cizhou, which produces magnetite. "Ancient Mine Records" also records the theory of "Ming Yi Governance": Cishan, 30 miles southwest of the county seat, is a primary mine, hence the name Zhou. Cishan, the hometown of compass. The authors of things and books about compasses are all in Zhao Yan Cultural District centered on ancient Han. Compasses in ancient China, recorded in the classic range, were all made of natural magnets.

According to pre-Qin classics, only Wu 'an Cishan (now Wu 'an, Handan City, Hebei Province) produced natural magnets. During the Spring and Autumn Period and the Warring States Period, it was possible to create Sina, only the Zhao Yan Cultural District centered on Handan, and Wu 'an was probably the hometown of compass.