Universal Magnetometer with Earth Inductor

Description
This instrument was designed and produced by the Department of Terrestrial Magnetism of the Carnegie Institution of Washington. Unlike the Carnegie's original universal magnetometer, this one is equipped with an earth inductor to determine dip. It is marked "DEPARTMENT TERRESTRIAL MAGNETISM Carnegie Institution of Washington E.I. - M. No. 28." It was completed in 1914 and used in many locations around the world. The U.S. Coast and Geodetic Survey used it in South and Central America in the early 1940s. The U.S. Geological Survey acquired it in 1973, when that agency took charge of the federal program in geomagnetism, and transferred it to the Smithsonian in 1982.
Ref: J. A. Fleming and J. A. Widner, "Description of the C.I.W. Combined Magnetometer and Earth Inductor," Terrestrial Magnetism 18 (1913): 105-110.
Carnegie Institution of Washington. Department of Terrestrial Magnetism. Land Magnetic Observations, 1911-1913 (Washington, D.C., 1915), pp. 9-12.
U. S. Coast and Geodetic Survey, Magnetic Observations in the American Republics 1941-44 (Washington, D.C., 1946), p. 16.
Object Name
universal magnetometer with earth inductor
Date made
1914
maker
Carnegie Institution of Washington. Department of Terrestrial Magnetism
Physical Description
metal (overall material)
Measurements
overall: wt. 37.5 g
Place Made
United States: District of Columbia, Washington
ID Number
1982.0671.07
accession number
1982.0671
subject
Measuring & Mapping
Science & Mathematics
Science & Scientific Instruments
Science & Scientific Instruments
See more items in
Medicine and Science: Physical Sciences
Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
U.S. Department of the Interior, U.S. Geological Survey
Additional Media

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