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pl23_cgs00093.jpg

Galitzin Vertical Component Seismometer and McComb-Rombergtilt compensation seismograph in: Coming to grips with theEarthquake Problem, by Nicholas H

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Galitzin Vertical Component Seismometer and McComb-Rombergtilt compensation seismograph in: Coming to grips with theEarthquake Problem, by Nicholas H. Heck, 1931. Journal of the FranklinInstitute, Vol. 212, No. 3, pp. 269-303.

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1930 ca.

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