Basic principles of the modern seismograph | Britannica
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In general, then, the seismograph is an instrument in which the relative motion of pendulum and ground is recorded. It is equally possible to take the ratio between ... If a common pendulum is free to swing in one direction and if the ground moves rapidly in the direction of f
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seismograph的意思、解釋及翻譯：1. a piece of equipment that measures and records the strength of an earthqu...
