Universal Magnetometer with Dip Circle

Description
This instrument, marked "D.T.M. C.I.W. No 21," was 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 instrument ended up in the hands of the U.S. Coast and Geodetic Survey, which transferred it to the Smithsonian in 1959.

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. Department of Terrestrial Magnetism. Land Magnetic Observations, 1911-1913 (Washington, D.C., 1915), pp. 7-9.

Location
Currently not on view
Date made
1912
maker
Carnegie Institution of Washington. Department of Terrestrial Magnetism
Place Made
United States: District of Columbia, Washington
Physical Description
metal (overall material)
wood (overall material)
Measurements
overall: 19 3/4 in x 10 in x 10 3/4 in; 50.165 cm x 25.4 cm x 27.305 cm
overall in case: 19 7/8 in x 10 3/4 in x 10 1/4 in; 50.4825 cm x 27.305 cm x 26.035 cm
ID Number
PH.316504
accession number
225703
catalog number
316504
Credit Line
U.S. Department of Commerce, Coast & Geodetic Survey
subject
Science & Scientific Instruments
See more items in
Medicine and Science: Physical Sciences
Measuring & Mapping
Science & Mathematics
Geomagnetism
Data Source
National Museum of American History, Kenneth E. Behring Center

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