Principle of fortune-telling compass _ Detailed explanation of the principle of fortune-telling compass

When using the geomantic compass, you need to hold the outer disk with both hands, and there are fewer places where your feet need to be separated. Put the compass between the chest and abdomen, keep the compass level, sit with your back facing it, and you can stand upright at first.

The crosshair silk thread on the compass needs to coincide with the front, back, left and right of the house. If the vertical direction of the crosshair is not accurate, the measured sitting posture will be biased.

After fixing the crosshair position, you need to move the inner disk with your thumb. If the inner disk rotates, Tianchi will also start to rotate. Until the inner disk rotates until the magnetic needle stops, the red line on Tianchi overlaps with it.

Principle and structure of compass

The principle of compass is actually the principle of using compass to locate: the earth is a big magnet, its geomagnetic south pole is near the geographical north pole, and the geomagnetic north pole is near the geographical south pole. The compass will point south and north under the magnetic force of the earth's magnetic field.

The compass consists of Tianchi and other parts. Tianchi, also known as the bottom of the sea, is also a 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 of Tianchi Lake, called the submarine line, and there are two red dots on both sides of the northern end. When in use, the northern end of the magnetic needle coincides with the seabed line.