Photographic seismic recorder as illustrated in: "Coming to Grips with the Earthquake Problem," by Nicholas H. Heck, 1931. Journal of the Franklin Institute, Vol. 212, No. 3, pp. 269-303.
Image ID: cgs00094, NOAA's Historic Coast & Geodetic Survey (C&GS) Collection Photo Date: 1930 Ca. Category: Geophysics Seismology/ • High Resolution Photo Available
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