Around what year was Zhang Heng's seismoscope introduced?

Answer

AD 132

Zhang Heng, a prominent scholar of the Han Dynasty, is attributed with the creation of his famous seismoscope in approximately AD 132. His life spanned from AD 78 to AD 139, and this invention marked a significant milestone in the history of science and engineering, predating contemporary seismology by nearly two millennia.

Around what year was Zhang Heng's seismoscope introduced?
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