Who invented the seismograph?

The seismograph was invented by Zhang Heng, a scientist in the Eastern Han Dynasty. Zhang Heng invented the seismograph because there were frequent earthquakes in the whole country at that time, which caused great losses to people's lives.

Zhang Heng personally felt the pain and decided to study an instrument to master the earthquake dynamics. After long-term research, he invented the waiting seismograph in Yangjiayuan, which is the first seismograph in the world.

The leaky astrolabe is a water-borne elephant. Use a copper ball with a diameter of more than four feet, which is engraved with 28 nights, Chinese and foreign officials, yellow equator, north and south poles, 24 solar terms, constant display circle and constant hidden circle to form an elephant, and then use a set of rotating machinery to combine the elephant with the clepsydra. The elephant is controlled by running water from a leaky kettle to make it rotate synchronously with the celestial sphere, thus showing the Sunday visual movement of the starry sky, such as the appearance of stars and the transit of the sun.

It also has a subsidiary organization called Ruilun Cai Ming, which is a mechanical calendar, connected with elephants by transmission devices. From the beginning of each month, a leaf is born every day; Drop a leaf every day after half a month. Among them, the second-class clepsydra used is the earliest known record of the second-class clepsydra.

Extended data:

The compass made by Zhang Heng is composed of two-wheeled unicycle by using mechanical principle and gear transmission. The trunk adopts a gear system with automatic clutch, and a woodcut fairy is placed on the upper layer of the trunk shell. No matter which direction the car rotates, the woodcut fairy's outstretched arm points south.

Zhang Heng studied hard all his life, studied hard, never tired and complacent, and kept improving. No matter in the field of knowledge, his achievements are extensive and profound; There are his outstanding works in literature and art, his comprehensive study of astronomical calendars, and his specialty in mechanical manufacturing.

On the other hand, in academic thought, he made unremitting struggle against Chen Wei, and in political practice, he had positive and enterprising activities. Especially in natural science, he is like an unprecedented invention of the armillary sphere and the seismograph. These rich and precious achievements occupy a lofty position in the history of science in our motherland and the world, and deserve our commemoration and study.