the seismograph was invented in ancient china in late second millennium bc.
when was the seismograph invented in ancient china?
late second millennium bc
the eastern han dynasty scholar and astronomer zhang heng (78–139 ad) invented the first water-powered rotating armillary sphere (the first armillary sphere having been invented by the greek eratosthenes), and catalogued 2,500 stars and over 100 constellations. in 132, he invented the first seismological detector, called the ""houfeng didong yi"" ("instrument for inquiring into the wind and the shaking of the earth"). according to the "history of later han dynasty" (25–220 ad), this seismograph was an urn-like instrument, which would drop one of eight balls to indicate when and in which direction an earthquake had occurred. on june 13, 2005, chinese seismologists announced that they had created a replica of the instrument.
history of science and technology in china
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outline of ancient china