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This type of unusually small magnetometer was designed by Emile Brunner in Paris in the 1880s and widely used by the French Magnetic Survey. This example is marked "Chasselon B Paris No 42" and "USC & CS No. 21." It was made by Victor Chasselon around 1900, and belonged to the U.S. Coast and Geodetic Survey. After finding impurities in its brass, the Survey lent this instrument to the Carnegie Institution of Washington, and then to C. K. Edmunds, president of the Canton Christian College in China.

Ref: E. Mascart, Traité de Magnétism Terrestre (Paris, 1900), pp. 211-214.

Daniel Hazard, "Results of Magnetic Dip and Intensity Observations," Report of the Superintendent of the United States Coast and Geodetic Survey Showing the Progress of the Work from July 1, 1901, to June 30, 1902, Appendix No. 6, p. 350.

Carnegie Institution of Washington. Department of Terrestrial Magnetism. Land Magnetic Observations, 1905-1910 (Washington, D.C., 1912), p. 6.

Currently not on view
Place Made
France: Île-de-France, Paris
Physical Description
metal (overall material)
overall: 10 in; 25.4 cm
circle: 4 in; 10.16 cm
overall: 10 in x 10 in x 7 1/2 in; 25.4 cm x 25.4 cm x 19.05 cm
ID Number
accession number
catalog number
Credit Line
U.S. Department of Commerce, Coast & Geodetic Survey
Science & Scientific Instruments
Science & Scientific Instruments
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Medicine and Science: Physical Sciences
Measuring & Mapping
Science & Mathematics
Data Source
National Museum of American History