Universal Magnetometer with Dip Circle
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.
- Currently not on view
- Date made
- Carnegie Institution of Washington. Department of Terrestrial Magnetism
- Place Made
- United States: District of Columbia, Washington
- Physical Description
- metal (overall material)
- wood (overall material)
- 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
- accession number
- catalog number
- Credit Line
- U.S. Department of Commerce, Coast & Geodetic Survey
- 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