The Department of Terrestrial Magnetism of the Carnegie Institution of Washington designed this theodolite magnetometer around 1904, combining the best features of the U.S. Coast and Geodetic Survey magnetometer and that used by the Magnetic Survey of India. This example is marked ";BAUSCH, LOMB, SAEGMULLER CO. Rochester, N.Y. 4594" and "C.I. MAGNETOMETER NO. 4." It was made in 1907 and, with tripod, cost $620.50.

Ref: J. A. Fleming, "Comparisons of Magnetic Observatory Standards by the Carnegie Institution of Washington," Terrestrial Magnetism 16 (1911): 61-84, on 62-63.

Bausch, Lomb, Saegmuller Co., Astronomical, Engineering and Other Instruments of Precision (Rochester, N.Y., 1907), pp. 41-43.

Carnegie Institution of Washington, Land Magnetic Observations, 1905-1910 (Washington, D.C., 1912).

Currently not on view
Object Name
Date made
Bausch, Lomb, Saegmuller Co.
Physical Description
metal (overall material)
wood (overall material)
box: 25 in x 14 3/4 in x 8 in; 63.5 cm x 37.465 cm x 20.32 cm
Place Made
United States: New York, Rochester
ID Number
accession number
catalog number
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 Commerce, Coast & Geodetic Survey
Additional Media

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