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Hsieh Chang-heng was born in 1962.
78 A.d
it was important for the emperor to know when and where an earthquake hit
John Milne invented the first modern seismograph, but the first ones were invented by Chang Heng around 132 AD.
It was used for the soldiers to carry their supplies in, it was invented by Chang Heng in 200 B.C. He was a Chinese general in the army.