Ground shaker at Position "A".
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: theb1335, NOAA's Historic Coast & Geodetic Survey (C&GS) Collection
Photo Date: 1937
Credit: C&GS Season's Report Patterson 1937-6
• High Resolution Photo Available
of the U.S. Department of Commerce, National Oceanic & Atmospheric
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April 30, 2013