Chinese Inventions:The seismograph

Andrew and Isaiah

Why it was made?

China always had earthquakes and the government wanted to know where the earthquakes would hit.A seismograph was made by a smart scientist, mathmatician, and inventor Chang Heng.
The seismograph was made in 1848. He envisaged the earth as a sphere with nine continents introduced crisscrossing grid of longitude. His invention was noted in court records of the later Han Dynasty in 132 CE.
Han Dynasty Seismograph in 132AD
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