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Seismic Data Processing, zdogan Y lmaz's best seller, was available at the Annual Meeting in New Orleans in 1987. This was to become the second all-time revenue producer behind Sheriff's dictionary.
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Instruments \ Seismic \ Seismographs \
Name: |
Model of First Seismograph |
Date: |
132 A.D. |
Item Number: |
87.67.01 |
Donor: |
N/A |
Type: |
N/A |
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Manufacturer:
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Cheng Heng, Chinese Mathematician |
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Description:
(Photos 1-3) A small scale model of the World's First Seismograph
(Photos 4-5) Large Scale version of the World's First Seismograph
Photos taken by John Northwood during an exhibition of the original
seismographs in China (1950's?).
The Chinese Ground Motion Meter, invented in 132 A.D.
by the Chinese mathematician, Cheng Heng, was the world's
first seismograph. This was the earliest and simplest
earthquake recorder. The eight wooden dragons each had a
ball in its mouth. When an earthquake occurred, a ball
dropped from a dragon's mouth into the frog's mouth
beneath it, indicating the direction of the tremor.
In 136 A.D. a Chinese name Choke updated this meter
and called it a Seismoscope. Columns were used instead of
balls which showed the occurrence and direction of an
earthquake. The vessels were hollow and filled with a
viscid liquid. The height to which the liquid was washed
up the side of the vessel indicated the intensity and
a line joining the points of maximum motion also denoted
the direction of the tremor.
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