Someone comes to buy a compass. I don’t know if it is a scam. Please help me check it out! ! !

This kind of thing is useless in the hands of ordinary people, so you will undoubtedly be cheated if you buy it.

However, for some professionals, he is very useful, and to them he is not a liar. Therefore, we need to look at this issue in two parts. However, there are too few professional personnel of this type.

Moreover, most of the so-called professional personnel are fake professionals. Those who can really understand it probably have something like this in their hands. Therefore, you might as well just think that he is a liar.

Behind the Compass

The invention of the compass did not happen overnight, but was gradually developed after a long period of hard research and continuous improvement. According to historical records, people first discovered that natural magnets can attract iron, and then discovered that magnets use geomagnetism to attract iron and always point to the south. Therefore, during the Warring States Period in the third century BC, people used natural magnetite to polish into what was then called "Sinan". ” compass.

He also invented a "compass car" with a wooden man installed on the car. There are many gears in the car. No matter how the car turns, the hand of the wooden man always points to the south. At the beginning of the first century AD, that is, in the early years of the Eastern Han Dynasty, Wang Chong recorded the historical facts of the magnetic spoon handle guide in "Lunheng".

However, since "Sinan" and others are made of natural magnets, they easily lose their magnetism, making them inconvenient to use and not very effective. In the Northern Song Dynasty, the famous scientist Shen Kuo summarized the experience of his predecessors and discovered the existence of geomagnetic declination in physics. He used the artificial magnetization method to make an easy-to-use and effective compass, which is to use natural magnets to become magnetic after friction. steel needle to guide.