Galvanometer Test Set (WWSSN)

Description
Each of the 120 stations in the World Wide Standard Seismological Network used an instrument of this sort to test the sensitivity of its galvanometers. This one is marked “Geotech / Model 8431 / Galvo Test Set / Microamperes / Mfd by General Electric Co.” It was used at Georgetown University in Washington, D.C.
Established in the early 1960s, the WWSSN was a key component of VELA Uniform, a Cold War project that was funded by the Advanced Research Projects Agency (ARPA), a branch of the Department of Defense. The WWSSN was designed to detect underground nuclear tests and generate valuable information about the earth’s interior and its dynamic processes. It was managed by the U.S. Coast and Geodetic Survey and then by the U.S. Geological Survey. That agency transferred this instrument to the Smithsonian in 1999.
Ref: United States Coast and Geodetic Survey, Instrumentation of the World-Wide Seismograph System, Model 10700 (Washington, D.C., 1962).
Location
Currently not on view
Object Name
galvanometer test set
date made
1961-1962
maker
General Electric Company
Measurements
overall: 18.5 cm x 10 cm x 11 cm; 7 9/32 in x 3 15/16 in x 4 11/32 in
ID Number
1999.0275.11
accession number
1999.0275
catalog number
1999.0275.11
subject
Measuring & Mapping
Science & Mathematics
Seismographs
event
Cold War
See more items in
Medicine and Science: Physical Sciences
Seismographs
Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
U.S. Geological Survey

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