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SCIENCE AND INVENTIONS . THE SEISMOSCOPE. What are we looking at?. What is the Seismoscope?. When was it made?. How does the Seismoscope work?. Why was the Seismoscope useful?. What is the Seismoscope.

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Presentation Transcript

What are we looking at?

What is the Seismoscope?

When was it made?

How does the Seismoscope work?

Why was the Seismoscope useful?


What is the Seismoscope

China had a lot of natural disasters, Millions were killed in floods and earthquakes. So then a person called Zang Heng made one of China’s Earliest inventions, In 132AD Zang Heng made: The Seismoscope. It showed where the earthquake was going to happen, and it was quick and also very efficient. The emperor could take action immediately to save the people from Earthquakes. It proved to be very successful and saved many lives.


When was it made

A person called Zhang Heng invented the seismoscope (also called Di Dong Yi )(Earth Motion Instrument) during 132 AD. Inside the seismoscope is a copper pendulum shaft connected to eight copper arms. The original seismoscope made by Zheng Heng was made of bronze. It was made of metal, brass was the most common metal and the ball was made of copper. A pillar in the instrument will sway in the direction of the initial movement when it is disturbed by an earthquake, and operated a mechanism which knocks the ball (from the jaws of the dragon which was facing the direction from which the quake came) and it falls into the mouth of the frog beneath. At that time, the seismoscope was the most accurate instrument that could sense earthquakes


How the Seismoscope works

The Seismoscope had eight dragonheads. Each of the heads faced a different direction with a frog below it with its mouth open. When the seismoscope detected an earthquake, the dragon that was facing that direction would drop its ball into the frog below. The Seismoscope had a small copper pendulum shaft inside it connected to the eight dragonheads. When an earthquake occurred the ball would be released through the shaft out the head and into the frogs mouth.


Why was it Useful?

The Seismoscope was very useful because it was very sensitive and very accurate. An exceptional example of this was when according to history, one day in February 138 A.D. Zhang Heng and several others found that the dragon facing west had dropped its copper ball. In response they made a report to the Emperor that an Earthquake had happened somewhere west of the capital. However, on that particular day nothing happened around Louyang. This led to suspicions and accusations toward Zhang Heng. However, within two days, several men riding on horseback were seen galloping in the direction of the west road from Louyang. The message they brought was that a violent earthquake 500km to the west had caused landslides. This evidence proves that not only is the Seismoscope accurate, but very sensitive


Made By:

Jason Swan 7E: Researcher, How the Seismoscope Works, Poster Designer and Maker.

Nick Leung 7E: Researcher, When was the Seismoscope Made, Poster Maker

Ryan Chan 7E: Researcher, Powerpoint Maker, What is the Seismoscope, Poster Helper, Leader of group

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