An Ancient China Seismograph is a machine for detecting the time and place of earthquakes and was first developed in Ancient China in 132 AD by Zhang Heng. Initially, until the machine began to be used on a larger scale no one believed him. Zhang Heng was born in 78 AD and passed away in 139 AD. The Ancient China Seismograph has been lost however sources claim that it was made out of high-quality bronze, was 5.5 feet high, looked like around wine jar and was 6 feet long.
Each of its 8 directions was decorated with dragons and a bronze toad structure was present at the ground of each. The mouth of the dragon was made of a metallic ball which would trigger and drop into the bronze toad when an earthquake occurred.
How did the Ancient China Seismograph work?
The theory of inertia operated here and the mechanics of the machine operated inside the system. When a movement of the ground displaced a pendulum along with the jar in which the pendulum was placed, the ball dropped and triggered via the lever and the gear. An earthquake in the western zone of China was detected via this machine and that was when the people started believing in the concept.
The modern-day Seismograph was invented only in 1880 about 1700 years after the first Seismograph was invented and was derived from Zhangs Concept.