The 2,000 Year Old Earthquake Detector

Who would have thought that 2,000 years ago, a gadget to detect earthquakes would exist? Zhang Heng of China was able to create the world’s first seismoscope (earthquake detector) way back in 132 A.D. during the Eastern Han Dynasty.
earthquake detector
Records state that in 138 A.D., Heng’s device correctly detected an earthquake that occurred 300 miles west of Louyang. No one felt the earthquake in Louyang prompting most people to dismiss it as a false call. Days later, a messenger arrived requesting aid, validating the results of Heng’s seismoscope.

Replicas of the device have worked with a precision comparable to modern instruments.

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