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How did the ancient chinese seismograph work.

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Patrick Mason

on 2 June 2014

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Transcript of How did the ancient chinese seismograph work.

On the inside
On the inside of the Ancient Chinese Seismograph, there was a pendulum that swung when the ground moved from an earthquake, which set off levers inside the seismograph which knocked the balls out of the dragons mouths and into the the toads mouths.
The seismograph was one of the most brilliant achievements in the history of Ancient China. It was invented in 132 AD, by a man known as Zhang Heng.
This way, the Ancient Chinese could tell which way the earthquake came from, by simply checking which toad had the ball in its mouth. They could also nearly pinpoint where the earthquake started by having seismographs at strategic point all-over China.
How did the ancient chinese seismograph work?
From the outside
From the outside, the Ancient Chinese Seismograph look like a giant bronze egg-shaped ball. It had eight dragons on the side, representing the eight directions on a compass. Below the dragons were eight toad sculptures waiting with their mouths open.
By Patrick Mason
The End
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