Ground shaker at Position "B". Used to determine earthquake engineering characteristics of buildings. C&GS was the first organization to undertake engineering seismology studies. Party of William D. Patterson
Image ID: theb1333, NOAA's Historic Coast & Geodetic Survey (C&GS) Collection Location: California Photo Date: 1937 Credit: C&GS Season's Report Patterson 1937-6 Category: Geophysics/Seismology/ • High Resolution Photo Available
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