Equipment for the Grand Coulee Dam seismograph station, arranged for photographic purposes. Dr. Dean S. Carder of the U.S. Coast and Geodetic Survey is simulating the adjustment of position of galvanometers on the Benioff film recorder. In the right foreground is the 10-cycle tuning fork amplifier, and at the back, a horizontal and a vertical seismometer.
Description
Equipment for the Grand Coulee Dam seismograph station, arranged for photographic purposes. Dr. Dean S. Carder of the U.S. Coast and Geodetic Survey is simulating the adjustment of position of galvanometers on the Benioff film recorder. In the right foreground is the 10-cycle tuning fork amplifier, and at the back, a horizontal and a vertical seismometer.
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Rights Notes
For permission to publish please contact Washington State University Libraries, Manuscripts, Archives, and Special Collections: (509) 335-6691.
