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Global Earthquake Monitoring, Its Uses, Potentials, and Support Requirements (1977) / Chapter Skim
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Early History of Seismic Networks and Instrumentation
Pages 8-10

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From page 8...
... , the Benioff quartzrod strain seismograph (l935) , the variable-reluctance transducer adapted for seismograph applications by Benioff in l932, and the application by LaCoste in l935 of the zero-length spring to systems suitable for detecting longperiod vertical motions.
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From page 9...
... Moreover, at the end of World War II most of the world's seismological observatories still lacked properly calibrated instrument systems with uniform response characteristics. A few individual stations did have calibrated systems, however; and special, long-period seismographs were installed in l956-l957, in widely separated places, by the Lamont Geological Observatory of Columbia University for use in the International Geophysical Year program.
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From page 10...
... l0 handful of dedicated workers, usually with minimal resources, and on the early instruments, which were adequate only for the study of travel times of seismic waves, of amplitudes of short-period phases, and, in some cases, of surface waves with periods as long as a few minutes.
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