Long-Period Galvanometer Control (WWSSN)
notes: label: Description
content: Each of the 120 stations in the World Wide Standard Seismological Network had three long-period control units for use with its three long-period galvanometers (such as 1999.0275.09). This one is marked “Galvanometer Control / Geotechnical Corp. / Garland, Texas / Model 12591 / Serial 17.” It was used at Georgetown University in Washington, D.C.
label: Description
content: 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 first 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.
label: Description
content: Incorporated in 1936, the Geotechnical Corporation conducted research in and produced instruments for the earth sciences. It got into defense work after World War II, went public in 1962, and was bought by Teledyne in 1965.
label: Description
content: Ref: United States Coast and Geodetic Survey, <i>Instrumentation of the World-Wide Seismograph System, Model 10700</i> (Washington, D.C., 1962).
label: Location
content: Currently not on view
topic: label: related event
content: Cold War
setName: label: See more items in
content: Medicine and Science: Physical Sciences
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content: Seismographs
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content: Science & Mathematics
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content: Measuring & Mapping
creditLine: label: Credit Line
content: U.S. Geological Survey
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 1999.0275.06
label: catalog number
content: 1999.0275.06
label: accession number
content: 1999.0275
objectType: label: Object Name
content: long-period galvanometer control
physicalDescription: label: Measurements
content: overall: 14 cm x 10.3 cm x 20.2 cm; 5 1/2 in x 4 1/16 in x 7 15/16 in