Magnet is not human invention, is a natural magnetite. The ancient Greeks and Chinese people find nature a kind of natural stone magnetized magnet, called "magnet." This stone can magically pick up small pieces of iron magnets, but after swinging freely always point in the same direction. Early sailors put this magnet as its earliest compass to identify the direction of the sea. The earliest discovery and use magnets should be Chinese people, which is the "compass", is one of China's four great inventions. After thousands of years of development, today has become a magnet strong material in our lives. Alloy synthesis by different materials can be achieved with the same effect as the magnet, but also can improve the magnetic force. In the 18th century there have been man-magnet, but the manufacturing process of a stronger magnetic sheet is very slow rectangular magnet manufacturers, until the 1920s to produce aluminum-nickel-cobalt (Alnico). Subsequently, the 1950s produced the ferrite (Ferrite), 70 years to create a rare earth magnets [Rare Earth magnet includes neodymium (NdFeB) and samarium cobalt (SmCo)]. Thus, magnetic technology has been rapid development of magnetic materials also makes the device more compact other ancient literature such as "Shan Hai Jing" also has a similar record. Magnetic properties of iron absorption was found very early, "Lu" chapter nine volumes have proficient: "chee move iron, or lead it too." At the time called the "magnetic" to "chee" They put a magnet to attract Iron seen as mother to attract children. And said: "The stone is a hard mother, but 石有慈 two and has not been kind, loving stone to attract his children, has not been kind of stone can not be attracted." Chinese people before the magnet is written 'chee stone "permanent neodymium iron-boron magnet, is the meaning of love stone. Another three hundred and twenty years in North cylindrical magnet, said the title of mountain shrub, its multi ailanthus Zhe, under which more than quicksand, more Tobe. There are animal behavior, its like a cow and a white tail, it sounds like Jiao, the name that the Father. Bird behavior, its like pheasant and female faces of the people, to see people you jump, the name startled Sri Lanka, since the Ming call also. Carpenter Han water out of Yan, while the West streamer in Ao Chak, where more magnet. Notes ③ magnet: Also as "chee Stone", a natural mineral, has attracted iron, nickel, cobalt and other metal material properties. Commonly known as a magnet, now known as magnetite. Compass, one of the four ancient Chinese invention, the system is the use of magnets made. Cylindrical magnet manufacturers, new magnetic Tong Xin (certified), the magnet is provided by Xin Tong, Dongguan City, the new magnetic Limited. Xin Tong, Dongguan City, the new magnetic Limited (www.dgxtxmagnet.com/) is Dongguan, Guangdong, magnetic leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. In the new Tong Xin magnetic leadership with the staff warmly welcome all inquiries to discuss, with new magnetic Tong Xin a better future.