Vertical, North-South, and East-West Galitzin-Wilip Seismometers at the Florissant, Missouri vault. Recording drum pictured in bottom photo, left of seismometers. - J.S.A. 25th Anniversary Commerative Vol., 1925-1950, J. B. Macelwane (J. B. Macelwane Archives, Saint Louis University)

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