Traditional Culture Encyclopedia - Weather forecast - Guess the answer to the weather. Four frogs on the ground and two dragons on the tripod guess architectural geography.

Guess the answer to the weather. Four frogs on the ground and two dragons on the tripod guess architectural geography.

seismometer

Seismograph is an instrument to monitor the occurrence of earthquakes and record earthquake-related parameters. It was made by Zhang Heng, a scientist in the Eastern Han Dynasty in China, in AD 132.