Ruska Variometer

Description
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.
Location
Currently not on view
Date made
1957
maker
Ruska Instrument Corporation
Place Made
United States: Texas, Houston
Physical Description
metal (overall material)
Measurements
overall: 19 1/2 in; 49.53 cm
ID Number
1982.0671.13b
accession number
1982.0671
catalog number
1982.0671.13b
Credit Line
U.S. Department of the Interior, U.S. Geological Survey
subject
Science & Scientific Instruments
Science & Scientific Instruments
See more items in
Medicine and Science: Physical Sciences
Measuring & Mapping
Science & Mathematics
Data Source
National Museum of American History, Kenneth E. Behring Center

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