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What's the birthplace of the first seismometer that consisted of 8 metal dragons holding 8 carved balls over 8 frogs?

Answer:

China

China is the birthplace of the seismograph. Built-in 132 A.D., it consisted of 8 metal dragons holding 8 carved balls over 8 frogs. If an earthquake made the ground vibrate, the dragon facing the quake’s source would drop a ball into the mouth of its corresponding frog.

Casual Added August 15th, 2019 by Devis Profile Picture Devis

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