Bulletin of the Seismological Society of America
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Bulletin of the Seismological Society of America; October 1960; v. 50; no. 4; p. 553-559
© 1960 Seismological Society of America
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Report on some experimental long-period seismographs

RALPH GILMAN

SEISMOLOGICAL LABORATORY, CALIFORNIA INSTITUTE OF TECHNOLOGY,, PASADENA, CALIFORNIA

Abstract

The unexpected usefulness in research of the Press-Ewing seismograph system (Press, Ewing and Lehner, 1958) has stimulated further efforts to obtain even higher seismograph sensitivity in the period range beyond 100 see. A major difficulty has been in maintaining pendulum stability at long periods. This paper describes a stable long-period seismometer and gives results from several seismograph systems incorporating long-period pendulums and galvanometers.




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