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