Chinese Inventions: Seimograpgh
David Lucas and Justin Bohn
Zhang Heng: Inventor
Zhang Heng was a celebrated astronomer of ancient China. An inventor of the seismograph and armillary sphere. He was one of the best astronomer of his time also. His greatest success came from building the seismograph because of how it tracked earthquakes it amazed everyone with his talents.
About the Seismograph
The seismograph is a machine that detects the location and power of a earthquake. It is also used to predict earthquakes. It is one of the most brilliant achievements in ancient China. If there is an earthquake the metal ball will fall out of the dragons mouth and into the toads mouth below. There are eight dragons and eight directions.
Han Dynasty Seismograph in 132AD