Chief
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mahmudbarde.bsky.social
Chief
@mahmudbarde.bsky.social
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minouette.bsky.social
Another of my scientists w/o a known birthday: ancient Chinese Han Dynasty polymath & statesman Zhang Heng (78-139) who invented a seismoscope (simplified seismometer which does not make a record of earth motions) to detect distant earthquakes & indicate their direction, 2000 years ago! 🐡🧪⚒️ #histsci
My linocut print of Zhang Heng in Han robe in blue ink on cream coloured washi paper with his seismoscope in bronze ink on the left and a cross-section schematic on the right in bronze ink with moving balls in red. Above in pale pink at chest level is a waveform of a horizontal surface wave (especially Rayleigh waves) is overprinted on top. The seismoscope is shown as knee-high urn, cylindrical with dome top with small sculpture birds on top. Midway up are a circle of dragon heads with balls in their mouth (4 are visible). At the base are 4 visible open-mouthed frogs. In the schematic you can see a pendulum moves and released a ball which goes in one of the radiating troughs abs hits a lever which released the tongue and ball in one dragon mouth which drops a ball (after Feng Rui et al, 2014)
January 7, 2024 at 1:42 PM