Many do not know, but many modern inventions in different forms have already been created quite a long time ago, it is just that official history does not recognize this. Some such as the battery, lenses, telescopes, and more that have been invented thousands of years ago, one such invention is the seismograph, made in China around 132 AD.
For everyone to understand, in our time, it is very difficult to determine earthquakes with accuracy and this is not always possible, but for the inventor Zhang Heng, apparently, it was not so problematic.
Zhang Heng was a specialist in mathematics, astronomy, and several other fields of science. How much it helped him to create such an accurate seismograph in the past is unknown, but he created it.
The seismograph is made in the form of a bronze vessel, up to 2 meters high. There were 8 dragons on the vessel, each of which showed the direction of the side in which the earthquake was supposed to occur.
Directly under each of the dragons there were toads, into whose mouth a ball of dragons fell, in case of tremors.
Thus, it was clear where the earthquake would occur. Moreover, the point was determined with almost perfect accuracy, which is impossible even now.
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In 2005, it was proved that this most ancient and accurate seismograph really worked and accurately determined possible earthquakes.
It was then, in 2005, that a Chinese scientist decided to make an exact copy of an ancient seismograph and, surprisingly, thanks to him, 4 earthquakes in China were predicted.
Now such data (and even then not always), specialists receive only with the help of expensive and most modern technology, and then a bronze vessel was simply created, no worse than modern technologies, it's funny, isn't it?
At the moment, as far as is known, an exact copy of this stunning invention is in the museum in Beijing.
What conclusion can be drawn? Only by making an exact copy of this invention was it possible to find out that then, somehow, the inventor did something incredible, even for our time.
Although the seismograph worked and determined with high accuracy where the earthquake would occur, as far as I know, the principle of its operation, or it would be more correct to say, such accuracy, was not understood.
In other words, the invention works, but how it determines with such precision as if it were modern technologies, no one could answer.