In the Yuan Dynasty, Wang Zhen designed and invented the rotary type plate for the discharge of movable type molds. The disc is disc-shaped and divided into several grids, and the movable type mold is arranged in the grid according to rhyme. There is a vertical shaft support underneath, which is fixed to the base. When typographing, two people cooperate, and one person reads the manuscript. One person turns the dial and quickly takes out the required font and arranges it into the plate. After printing, the fonts are restored to the grid one by one, which is time-saving and convenient.
Rotary typeboard
compass
Northern Song Dynasty water float compass
'Northern Song Dynasty hanging compass
The magnetic needle is inserted through the cordyceps, placed in a bowl containing water, and with the help of the buoyancy of the water, the magnetic needle floats on the surface of the water, indicating the north and south. This kind of compass is highly practical and was first used in navigation.
Yuan Dynasty Guide Turtle Model
Yuan Dynasty Guide Turtle
This is a support-type magnetic guide tool carved from wood into the shape of a turtle, a magnet is installed in the turtle's abdomen, a magnetic needle is placed in the turtle's tail, and the wooden turtle is placed on the vertical axis of the spire, and when it is stationary, the head and tail of the turtle indicate the north and south directions
Song Dynasty rockets and muskets
firearm
Rockets and protruding guns appeared in the Song Dynasty. The rocket is to tie the powder canister at the front of the arrow shaft and use the reaction force of the gunpowder to fire the arrow out. The assault gun is the use of bamboo barrels as a gun body, filled with gunpowder and bullets, after burning gunpowder, bullets will be launched at a high speed, the range of more than 200 meters firearms developed to the Yuan Dynasty, the fire bolt has become the mainstream of firearms, it is the prototype of modern guns.