Can I buy a compass at will?
You can buy a compass at will. There is nothing to be afraid of. When the geomantic compass is not in use, it is best to put it upside down so that the magnetic needle will not be damaged. Placing the compass casually will cause problems with the compass and make it unusable.
Compass Tianchi is also called the bottom of the sea, which is the compass. The Tianchi of the compass consists of thimble, magnetic needle, submerged wire, cylindrical outer box and glass cover, which are fixed in the center of the inner disk. There is a sharp thimble in the center of the bottom surface of the round box, and a concave hole in the center of the bottom surface of the magnetic needle, and the magnetic needle is placed on the thimble. The arrow of the compass points south at one end and north at the other.
There is a red line at the bottom (seabed) of Tianchi Lake, which is called the submarine line, and there are two red dots on both sides of the northern end. When in use, it is necessary to make the northern end of the magnetic needle coincide with the seabed line.
The seabed of modern compasses is painted with a cross, and the top of the cross is printed with southeast and northwest respectively. When in use, the northern end of the magnetic needle should point to the northern end of the submarine reticle, and the magnetic needle should coincide with the north-south line of the submarine.