Zhang Heng; Chinese mathematician; astronomer; geographer; writer and inventor of the Han period; Nanyang 78 - Luoyang 139.- Zhang Heng with the seismoscope he invented. -(A pendulum set in motion by the quake waves releases a ball over one of the eight dragon heads and drops it into a toad's mouth underneath; which indicates the direction of the epicenter).Chinese illustration; 20th century.

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達志影像

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