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The vertica1 seismograph herein described makes use of a mechanical of short period in combination with an electro-mechanical transducer of high sensitivity coupled to a recording galvanometer. In the seismograph the transducer consists of a coil which moves in a field in such a manner as to generate electromotive force proportional to the velocity of the inertia reactor. The present transducer a modification of the common telephone receiver principle and also of the velocity type.
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Hugo Benioff (1932) studied this question.
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