DESIGN THEORY OF HOUFENG SEISMOGRAPH BASED ON SEISMIC RESPONSE SPECTRUM (MT) by ZHU YuTian, LI YaMei, LIU Zhao, XU Hao, LIU YuMing

“…The authenticity of the Houfeng seismograph, invented by the great scientist of the Eastern Han Dynasty, Zhang Heng, has been questioned by the outside world, because it has not yet been restored to a recognized model after being lost. …”
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