Type of ship
This document describes the type of Joseon dynasty. The active compilation business following the promotion of education promoted the development of typography and paper making. The metal type, which was invented and invented for the first time in the 13th century, was further improved since the early Joseon Dynasty, and was later cast in the headquarters in the order of the Miji, the Light, and the Thunder. Among them, Thoughts are beautifully printed and easy to print, and there are about 20 million types of prints. The metal used to make the type was initially lead, but starting in 18, King Sejong began to use stronger copper. The number of type casts produced per day was about 3,500, which is about 10 times that of Germany's Gutenberg. In the past, we used the method of fixing the type by using wheat. From the time of King Sejong, we invented a method to assemble the plate, and the printing efficiency was doubled and the printing effect became much clearer.