This thing was surrounded by eight dragons with copper ball in its mouth which looked at
eight copper frogs, each of which is facing a different direction. Copper pole in the middle
eight copper frogs, each of which is facing a different direction. Copper pole in the middle
connected with eight connectors. If there is a seismic vibration, the pole will bend, it causes
the dragon as if to drop the ball into the mouth of the frog, which shows the epicenter.
கி.பி. 100 -ஆம் ஆண்டிலேயே
சீனர்கள் கண்டுபிடித்த பூகம்ப அளவீட்டுக் கருவி
மாதிரிக்கு ஓர் நவீன கருவி
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