The attrition force because of water far peccadillo dish, so of guideline fish point to more accurate than wanting south department much.
Compass can point to southern magnetic needle from beginning to end below the action of earthly magnetic field namely, it is one of 4 big inventions of Chinese ancient time, appear the earliest at period of the Warring States. The compass at that time manages namely south. Become with carve of natural magnetism ore south department, the appearance resembles a ladle, be placed to be in a surface on the smooth, territory under one's control that quarter have position.
South department
Compass develops period of Northen Song Dynasty, appeared again a kind of more advanced guideline fish. Chinese common people had mastered the technology that makes artificial magnetic body at that time, the tagger make it that uses magnetization tool of guideline of a kind of pisciform, it is the earliest guideline fish. After guideline fish comes out, improve through relapsing, final development becomes a kind to lay the tool in direction of the demonstrate in water. At this moment the fish that guideline fish had become to carve and be become with wood, there is a natural magnet with candle in piscine abdomen, antarctic aimed the direction of piscine head, there still is a needle in piscine mouth. When guideline fish is put in water, the needle in piscine mouth can point to south.
Guideline fish
After this, discovery of Chinese common people puts steel pin on magnetite to chafe ceaselessly, can make the steel injection that gives magnetization, can indicate direction. They make the compass that go out accordingly, it is the compass that we say normally.
Chinese people invented compass the earliest, went to compass application the earliest also nautical in. Before this, the sailor is in maritime can rely on observation sun and star to discern only azimuth, meet day of overcast and rainy, can lose way very easily. Period of Northen Song Dynasty, compass is gone to by application first nautical in. Ming Dynasty period, zheng He finished Yuan Hang 7 times below the help of compass, finished the mankind is nautical history the one big feat that go up.
Period of the Southern Song Dynasty, area of compass by Arabia travels person Europe each country, the development of this nautical to Europe career rose to urge action tremendously.
