It is the third of the four great inventions in ancient my country.
1. Papermaking was invented in the Western Han Dynasty and was further improved in the Eastern Han Dynasty by the famous inventor Cai Lun.
2. China is the first country in the world to start raising silkworms and weaving silk. Those silk floss also inspired the working people. They weaved the remaining wadding into thin sheets and then they could write. On this basis, Cai Lun Paper is made from discarded raw materials such as bark and fishing nets. This kind of paper was quickly accepted by everyone because of its low raw materials.
3. The compass was called Sinan in ancient times. It is mainly composed of a magnetic needle mounted on a shaft. This magnetic needle can rotate under the action of a natural magnetic field to point people in the direction. It was often used in ancient times. in navigation, military and surveying. There are three main types of compasses invented in ancient my country: the compass, the compass, and the magnetic needle.
4. Gunpowder is an agent that can be ignited by sparks, flames, etc. According to the ancient book "Fan Zi Ji Ran", my country has already used gunpowder among the people as early as the Spring and Autumn Period. This invention It was not used too much in ancient times. Instead, it was widely used in wars in modern times, playing a role in quelling wars and providing security for mankind. It is one of the important inventions of human civilization.
5. Printing is an invention based on papermaking. It can be said that without papermaking, there would be no printing. Printing was invented in the Tang Dynasty and was widely used in the late Tang Dynasty. Later, Bi Sheng invented movable type printing and was the first inventor of movable type printing in the world.