Variometer
date: label: Date made
content: 1957
name: label: maker
content: Ruska Instrument Corporation
notes: label: Description
content: This variometer measures slight changes in magnetic declination. The surrounding Helmholtz coil enables its scale value to be determined electrically. It is marked "RUSKA INSTRUMENT CORPORATION HOUSTON TEXAS No. 5733 MADE IN U.S.A." The U.S. Coast and Geodetic Survey acquired it in 1957, probably for use during the International Geophysical Year. The U.S. Geological Survey acquired it in 1973 when it assumed responsibility for the geomagnetic program of the federal government, and transferred it to the Smithsonian in 1982.
label: Location
content: Currently not on view
place: label: Place Made
content: United States: Texas, Houston
topic: label: Subject
content: Science & Scientific Instruments
label: Subject
content: Science & Scientific Instruments
setName: label: See more items in
content: Medicine and Science: Physical Sciences
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content: Science & Mathematics
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content: Measuring & Mapping
creditLine: label: Credit Line
content: U.S. Department of the Interior, U.S. Geological Survey
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 1982.0671.13b
label: accession number
content: 1982.0671
label: catalog number
content: 1982.0671.13b
objectType: label: Object Name
content: variometer
physicalDescription: label: Physical Description
content: metal (overall material)
label: Measurements
content: overall: 19 1/2 in; 49.53 cm
label: Measurements
content: overall: 16 1/4 in x 12 in x 6 7/16 in; 41.275 cm x 30.48 cm x 16.35125 cm