Name: Homemade Compass

Item No. : KX1337

Gross weight 20G

Size: 14*11CM

Packing quantity: 500

Outer box dimensions: 60*50*55

The compass is the result of the ancient Han Chinese working people's long-term practice of understanding the magnetic properties of objects. As one of the Four Great Inventions of ancient China, its invention has played an immeasurable role in the development of human technology and civilization. In ancient China, the compass was initially used in sacrifices, rituals, military affairs, divination and feng shui to determine directions. At the end of the 11th century or the beginning of the 12th century, Chinese ships began to use the compass for navigation. The Northern Song Dynasty's "Pingzhou Ketan" states :" The boatman (the helmsman) knows the geography. At night, he observes the stars; during the day, he observes the sun; and on gloomy days, he observes the compass."

A compass is a simple instrument used to determine directions. The predecessor of the compass was the Sinan, one of the Four Great Inventions of ancient China. The main component is a magnetic needle that is mounted on an axis and can rotate freely. A magnetic needle can remain in the tangential direction of the magnetic meridian under the influence of the geomagnetic field. The north of the magnetic needle points to the geographical north. By taking advantage of this property, directions can be identified. It is commonly used in navigation, geodesy, travel and military affairs, etc. There are also bands and films with the same name.

The principle of the compass: The term "compass" actually evolved from the ancient Chinese custom of "Si Nan". At that time, "Si Nan" did indeed point south. Nowadays, the "south" in "Compass" refers to a general term for direction rather than having a specific literal meaning. The red end of the current compass points to the north of the Earth. This is because the compasses made nowadays are uniformly made in accordance with the standard. The red end of the magnetic needle is the north side of the magnetic needle, denoted by N (the white end of the magnetic needle is the south side, denoted by S). In a compass, the red end N points to the north. Since the geographical north of the Earth is actually the south of the Earth's magnetic field, according to the principle of opposite poles attracting each other, the north of the magnetic needle will be attracted and point towards the south of the magnetic field, that is, the geographical north direction