Zhang Heng (78- 139) was born in Hirako. Han nationality, a native of Xi 'e, Nanyang (now Shiqiao, Nanyang City, Henan Province), is one of the five saints in Nanyang, and is also known as the four masters of Han Fu with Sima Xiangru, Yang Xiong and Ban Gu. China was a great astronomer, mathematician, inventor, geographer and writer in the Eastern Han Dynasty. He successively served as Langzhong, Taishiling, Shizhong and Hejian. In his later years, he became the minister of history of the DPRK due to illness. Yu Yonghe died in the fourth year (139) at the age of 62. In the Northern Song Dynasty, it was named Bo Er of Xi.

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As early as 2003, Professor Feng Rui of Chinese Academy of Sciences restarted the exploration and demonstration of "Zhang Heng Seismograph". It is based on the record of the word 196 found in Zhang Hengchuan of the Later Han Dynasty. Later, relevant records were found in seven ancient books, such as Continued Han Dynasty and Records of the Later Han Dynasty. Finally, it was expanded from the word 196 to 238 words. Perhaps Feng Ruifu originally proposed a seismograph model that is more scientific, logical and historical, but it is just a family statement.

Compared with predecessors, today's scientific and technological level has been greatly improved. But this does not mean that we can understand our predecessors and their inventions. Science is a process of continuous development, and sometimes even a process of constant error correction. So is Zhang Heng's seismograph. No one is sure that the restored seismograph model must be the one made by Zhang Heng. Feng Rui himself said that this is just "our understanding of Zhang Heng in the current era".

Baidu Encyclopedia-Zhang Heng

The battle of the phoenix. Com and Zhang Heng Seismograph: Scientific exploration is always on the road.