Ma Jun's most outstanding performance is to restore the South Compass; Improve the bulky loom at that time; Invented keel waterwheel to guide water from low to high; A rotary stone feeder is made, which can continuously fire stones up to hundreds of steps. Putting the wooden original wheel under the puppet is called "a hundred tricks of hydration". Since then, Ma Jun has also reformed Zhuge Lian crossbow and made contributions to scientific development and technological progress.
Extended data
Ma Jun was born in poverty, and many of his inventions played a considerable role in the development of productive forces at that time. Because of his profound attainments in transmission machinery, people spoke highly of him at that time and called him "the name of the world".
Ma Jun stuttered from childhood and was not good at talking, but he liked to think, was good at thinking, paid attention to practice, studied hard, and especially liked to study mechanical problems. Ma Jun lived in poverty in his early years and lived in the countryside for a long time. He paid more attention to the reform of production tools and made outstanding contributions.
Ma Jun's youth is playing, but he doesn't realize his talent. When I was a doctor, I lived in poverty, so I improved the silk loom and became famous for it. Later, he served as a minister in Wei State and developed machinery at the same time. When I was in Wei Mingdi, I saw that there were 50 nie (pedal control board) for 50 warp and 60 nie for 60 warp, so I changed the loom to 12 nie, which greatly improved the efficiency.