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Documentation of magnets

① There are similar records in other ancient books, such as the Classic of Mountains and Seas. The iron-absorbing property of magnets has been discovered for a long time. The nine volumes of the Mastery of Lu's Spring and Autumn Annals contain: "Mercy attracts iron, or lead it." At that time, people called "magnetism" as "mercy". They regarded magnets attracting iron as the attraction of a loving mother to her children. He also believed that "stone is the mother of iron, but there are two kinds of stone: kind and unkind. The kind stone can attract his children, but the unkind stone cannot." Before the Han Dynasty, people wrote the magnet as "kind stone", which means the kind stone.

② Three hundred and twenty miles to the north, it is called Guanti Mountain. There are many Ailanthus on it, and many quicksand and rocks under it. There is an animal. Its shape is like an ox and its tail is white. Its sound is like a fish. It is called the father. There is a bird. It looks like a female pheasant and looks like a human face. It jumps when it sees a human face. It is called Das, and its song is also called. The craftsman Han Zhi's water flows out of Yan, while the water flows in the west, and there are many magnets in it.

③ Magnet: also known as "Cishi", a natural ore with the property of attracting iron, nickel, cobalt and other metal substances. Commonly known as magnet, now called magnet. The compass, one of the the Four Great Inventions in ancient China, was made of magnetite.