Universal Magnetometer with Dip Circle

Description
This instrument is marked "D.T.M. C.I.W. N° 19." Designed and built by the Department of Terrestrial Magnetism of the Carnegie Institution of Washington in 1912, it incorporates an astronomical telescope and magnetometer for the determination of magnetic declination and horizontal intensity, and a dip circle with a Lloyd-Creak attachment for the determination of inclination and intensity. It is relatively light and easy to manipulate. It was used for a few years and then set aside when the universal magnetometer with earth inductor came into use.
This magnetometer was probably transferred to the U.S. Coast and Geodetic Survey after the Carnegie Institution closed its geomagnetic program. The U.S. Geological Survey acquired it in 1973, when it took over the geomagnetic program of the federal government, and transferred it to the Smithsonian in 1982.
Ref: J. A. Fleming, "Two New Types of Magnetometers Made by the Department of Terrestrial Magnetism of the Carnegie Institution of Washington," Terrestrial Magnetism 16 (1911): 1-12.
Carnegie Institution of Washington, Land Magnetic Observations, 1911-1913 (Washington, D.C., 1915), pp. 7-8.
Object Name
universal magnetometer with dip circle
Date made
1912
maker
Carnegie Institution of Washington. Department of Terrestrial Magnetism
Physical Description
metal (overall material)
wood (part material)
Measurements
overall: 11 3/4 in x 8 1/2 in x 18 in; 29.845 cm x 21.59 cm x 45.72 cm
Place Made
United States: District of Columbia, Washington
ID Number
1982.0671.03
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 Interior, U.S. Geological Survey

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