What's the name of the compass?

The invention of the compass with physical direction indication consists of 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.

The main part of the compass is the magnetic needle installed on the rotating shaft. Under the action of natural geomagnetic field, the magnetic needle can rotate freely and keep in the tangential direction of magnetic meridian. The north pole of the magnetic needle points to the geographical north pole, and the direction can be distinguished by this property. It is often used in navigation, geodesy, tourism and military affairs.

Extended data

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.

Baidu encyclopedia-compass