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Bulletin of the Seismological Society of America; December 1970; v. 60; no. 6; p. 2015-2022
© 1970 Seismological Society of America
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Modifications to Willmore's method for calibrating seismographs using a maxwell bridge

R. E. WHITE

DEPARTMENT OF GEOPHYSICS, FACULTY OF SCIENCE THE UNIVERSITY OF WESTERN ONTARIO, LONDON 72, Canada

Abstract

The substitution of an oscilloscope as detector into a Willmore bridge circuit allows a simple, accurate, and direct method of calibration for seismometer systems. An example of the method is given and its modification for a seismometer having appreciable inductance is discussed. It is also shown that transient methods do not allow an accurate determination of high-frequency response.






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