Timer, bridge, saddle.

lunisolar calendar

The oldest catalog in the world-Stone catalog

Armature —— An Instrument for Demonstrating Apparent Motion of Celestial Bodies

The oldest timekeeping instrument in China-kettle leak

Zhang Heng's seismograph

Calendar Revolution —— Shen Kuo's Twelve Calendars of Qi Dynasty

A Wonderful Flower of Science and Technology —— Astronomical Instruments Invented and Developed by Guo Shoujing

Zu Chongzhi and Pi.

abacus

Magnetic declination and magnetic inclination

Measuring tool-vernier caliper

Projection slide

Bamboo slips and wooden slips

Silk books and silk paintings

Silk cotton paper-Hetty

The world's earliest plant fiber paper

Luo's equatorial instrument in Han dynasty

China Song Dynasty astronomer Su Song. In cooperation with Han Gonglian, the planetarium and water transport platform were established, which was the first planetarium in ancient China.

Wei ren Ma Jun invented the water dragon bone car.

Ding Huan (Han Dynasty) invented the quilt incense burner, the constant full lamp and the revolving fan.

Du Shishou pioneered the discharge of hydraulic sand blasting equipment. That is, using water power to push the fan to blow. It is the earliest hydraulic blower in the world, 1 100 years earlier than Europe.