Chinese seismograph 2

Ancient Chinese Seismograph

  • 139

    Ancient Chinese Seismograph invented

    Ancient Chinese Seismograph invented
    Zhang Heng creates the Ancient Chinese Seismograph
  • 140

    Seismograph sucessfully detects earthquake in Ganzu Province

  • 430

    Seismograph Disapeared

    400 years after the creation of the original seismograph by Zhang Heng, it dissapears and is never seen again
  • Italian Earthquake Detecting Device - Bowl filled with mercury

    Italian Earthquake Detecting Device - Bowl filled with mercury
    Italian Scientists develop a way of detecting tremors in the ground. A cup filled with mercury was used to do this.
  • Luigi Palmeri's invented his own Seismograph

    Luigi Palmeri's invented his own Seismograph
    Luigi Palmeri, an Italian scientists make his own seisometer. It consists of sevral U-Shaped tubes filled with mercury, pointing in different directions. When the ground shook, the motion of the mercury stopped a clock simultaneously to start a recording drum, on which the motion of a float on the surface of mercury was registered
  • Japanese Seismological Society is founded

    The Japanese Seismological Society is founded by Sir James Alfred Ewig, Thomas Gray and John Milne.
  • Horizontal Pendulum Seismograph invented by John Milne

    Horizontal Pendulum Seismograph invented by John Milne
  • European seismographs created

    European seismographs created
    European scientists build on Zhang Heng's idea and make their own seismograph.
  • Press - Ewing Seismograph developed in the USA.

    Press - Ewing Seismograph developed in the USA.
    After World War II, many advancements are made on the horizontal pendulum seismograph by Sir Ewing. This final seismograph is called the Press - Ewing Seismograph and is used throughout the world.