The old black technology Zhang Heng seismograph was deleted from the history books. What is this?

Although science and technology are very developed now, we can go to heaven or land, or visit any place in the world, but we are still very small in front of nature and helpless in the face of many disasters. Doesn't mean we have to wait and die, like an earthquake. We can't stop earthquakes, but we can explore their laws through technology. Take some preventive measures to reduce losses.

In fact, this method existed in ancient times. It is the seismograph we saw in the history books when we were young, but we don't know when it was deleted from the historical materials. The seismograph was invented by a man named Zhang Heng in the Eastern Han Dynasty, and it was 1 in the world at that time. This means a lot. It was mainly for earthquake monitoring.

According to previous textbooks, when an earthquake is detected, the ball of the seismograph will automatically fall out of the animal's mouth. When this instrument was first invented, not many people believed it. Later, the seismograph detected the earthquake, and people in Luoyang didn't notice it at that time, so it was ridiculous to accuse the invention. A few days later, in Longxi, near Luoyang, it was reported that an earthquake had occurred a few days ago.

Only then did people realize the power of Zhang Heng's seismograph. With the development of history, there is no more powerful seismograph, which was later included in our history books. It has been deleted now. What we see is not a real seismograph, and it doesn't actually have much effect. Actually, it's just a decoration. The original thing is long gone. Its principle, manufacturing technology and style are all a mystery. There is no record of cultural relics, and some people question its existence.