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Keywords: Zhang Heng's seismometer internal reproduction with inverted pendulum.png 今 明恒による 立振子を用いた張衡の 動 の内部再現 Zhang Heng's seismometer internal reproduction with inverted pendulum by Akitsune Imamura of Japan 1938年<br/> upload date 2014-10-06 13 10 45 第1輯 第10巻第4号(1938年刊) Seismological Society of Japan 日 学会 other versions Custom license marker 2014 10 06 PD-Japan-oldphoto Uploaded with UploadWizard Zhang Heng Seismometers Akitsune Imamura |