Specific historical facts of the four great inventions (two items)

The book Zhou Ping Ke Tan written by Mi Zhu in the Northern Song Dynasty recorded the application of compass in navigation for the first time. "Sailors know geography, but they look at the stars at night and the sun during the day, and their compasses are blurred."

From A.D. 1004 to 1048, Bi Sheng, an engraver in the Northern Song Dynasty, made a rectangular long column with fine and sticky clay, carved characters on it, and put it into a kiln to make it into movable type. Then, according to the content of the article, put the words in order, put them on the iron frame to make a printing plate, and then put them on the fire to heat and flatten them, and you can print. Take off the movable type after printing and use it next time. This improved printing is called relief printing.