Thecompassisintroduced

　　Acompassisasimpleinstrumentdiscriminationrange,alsoknownasthecompass,accordingto"record"ontheearliestrecordsappearedintheWarringStatesperiodmagneticmountainarea.ThecompasswasformerlyoneofthefourgreatinventionsofancientChina'scompass,istheresultofancientChineselaborpeopleunderstandingofmagneticobjectsinthelong-termpractice.

　　Themaincomponentsaremountedonashaftcanfreelyrotatetheneedle,theneedlecanremaininthetangentmagneticradialdirectiononthegroundundertheactionofmagneticfield,magneticneedlepointstothegeographicalNorthpolepole,directioncanbeidentifiedbythisperformance.Commonlyusedinnavigation,geodesy,travelandmilitaryetc..

　　指南针的介绍

　　指南针是一个简单的仪器歧视的范围,也被称为指南针,根据"；记录"；对记载最早出现于战国时期磁山地区.指南针的前身是一家中国古代四大发明的指南针,是中国古代劳动人民在长期的实践中的磁性物体的理解结果.

　　主要部件安装在轴上可以自由转动的磁针,针能保持在磁子午线的切线方向上的磁场的作用下,地面,磁针指向地理北极极点,利用这一性能可以辨别方向.常用的导航,大地测量学,旅游和军事等.