Ancient Chinese seismoscope invented in 132 AD by the Chinese scholar Zhang Heng.
https://diqn32j8nouaz.cloudfront.net...eismoscope.jpg
https://diqn32j8nouaz.cloudfront.net...ismoscope1.jpg
More:
https://www.engadget.com/2018/09/28/...g-seismoscope/
Previously:
https://www.homemadetools.net/forum/...348#post142352
https://www.homemadetools.net/forum/...icle-gif-73957
https://www.homemadetools.net/forum/...151#post130337
