Name：自制Compass

Item number：KX1337

MAO Zhong;20G

"Size"：14*11CM

Number of boxes packed：500

Outer box size：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。作为中国古代四大发明，Its invention has contributed to the development of human technology and civilization，It has played an immeasurable role。In ancient China，Compass起先应with于祭祀、Etiquette、Determining directions in military affairs, divination and feng shui。11At the end of the century or12At the beginning of the century，中国船舶开始使withCompass导航。Northern Song Dynasty《Pingzhou is worth discussing》:"Boatman(Helmsman)Understand geography，At night, one stargazes，Observe the sun during the day，阴晦观Compass。"

A compass is a simple instrument used to determine directions。Compass的前身是中国古代四大发明的Sinan。主要组成部分是一根装在轴上可以自由转动的磁针。磁针在地磁场作with下能保持在磁子午线的切线方向上。The north of the magnetic needle points to the north of the geography，This property can be utilized to identify directions。It is often used in navigation、Geodesy、In terms of travel and military affairs, etc。 There are also bands and films with the same name。

The principle of the compass  Compass，This statement，In fact, it originated from ancient China“Sinan”It evolved from the conventional expression。At that time“Sinan”，It does point to the south。And up to now，“Compass”This one“south”It refers to a general term for direction，And it no longer has the actual specific meaning on the surface。  现在的Compass红色端，It points to the north of the Earth。This is because，现在制作的Compass统一是按照标准，The red end of the magnetic needle is the north end of the magnetic needle，withN"Indicate(磁针白色端为磁针的south，withS"Indicate)。At the red end of the compassNIt points to the north，因为地球的地理北实际上是地球磁场的south，So according to the principle of opposites attracting each other，The magnetic needle will be attracted to the north and point towards the south of the magnetic field，That is, the northern direction of geography