During the warring states period SiNa is what kind of

SiNa was invented in the spring and autumn period and the warring states period is a tool can instruct the north-south direction.Before that, the ancient people have found a special kind of stone, it has a magnetic iron absorption, as a magnet.Later, people found that strip of magnet can instruct the north-south direction.So the craftsmen grinding magnet hewed a spoon, in bright and clean bronze chassis, chassis engraved with the gossip said position and power.

With his hand upon the magnetic scoop, when it stopped spinning, spoon handle refers to the direction of the south, and ShaoKou refers to the direction is due north.This is the world's oldest point instrument, called SiNa."The company" is the meaning of "refers to".

Can say, SiNa is feng shui compass.