Wholesale Compass Tianchi Brass Strong Magnetic Fine Needle Compass Accessories

Product Overview

Description

About compass 

 

To discriminant bearing a simple instrument. One of the four great inventions of ancient China. The main component is a perfectly on the shaft is free to rotate the needle. Needle under the effect of the magnetic field can keep on the tangent direction of the magnetic meridian. Magnetic North Pole to the geographic South Pole, the performance can be used to identify the direction. Often used in navigation, geodesy, travel and military, etc.

China's use of the compass, soon be taken, the Arab ships and the arabs to this great invention spread to Europe. Engels pointed out that in the "dialectics of nature", "the hand needle from the arabs to Europe around 1180". In 1180, is China's southern song dynasty filial piety of chunxi for seven years. The Chinese first apply the compass sea-faring earlier than europeans, at least 80.

Northern song dynasty famous scientist shen kua (MengXi stature "author), in production and application of compass discovered the existence of the magnetic declination of scientific practice. He brilliantly pointed out that this is because the earth's magnetic poles is not straight to the north and south poles. The compass and the magnetic declination theory has played a huge role in the ocean sailing, enable people to obtain the capability of the all-weather navigation, the first time obtained the freedom of sailing in the ocean. Since then has opened up many new routes, shorten the distance, speed up the development of the shipping, to promote the cultural communication between people from different countries with trade. Guidelines on how to say the importance of navigation cause too much.