FIRST TRY ON RESTORATION PLAN FOR PRINCIPLES OF HOUFENG SEISMOGRAPH INVENTED BY ZHANG HENG
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    Abstract:

    The following article is based upon the account in Fan Ye's Book of Later Han Dynasty:Biography of Zhang Heng.It clearly puts forward the restoration plan for various functions and principles of the Houfeng seismograph by Zhang Heng.The plan stresses that the Houfeng seismograph can receive the vertical component and the horizontal component of the first seismic wave,and thus can be used to tell the approximate direction of the seismic source.When the first seismic wave is not strong enough for an alarm to be given,it is used to surpress the secondary wave to prevent such secondary wave as the shear wave from interfering the determination of the azimuth.The paper deduces that Zhang Heng had spent several decades for observing,experiment and improvement during the course of inventing this device.

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History
  • Received:December 10,1989
  • Revised:
  • Adopted:
  • Online: June 30,2017
  • Published: