Toepfer Variometer

Description
This variometer, which measures slight changes in the horizontal intensity of the earth's magnetic field, is based on a design developed by J. F. A. M. Eschenhagen, Director of the Prussian Magnetic Observatory at Potsdam. It is marked "Otto Toepfer Potsdam XII." The U.S. Coast and Geodetic Survey obtained several variometers from Toepfer around 1901 and kept them in use for many years. The U.S. Geological Survey acquired this example in 1973 when assumed responsibility for the geomagnetic program of the federal government, and transferred it to the Smithsonian in 1982.
Ref: M. Eschenhagen, "Magnetic Intensity Variometers," Terrestrial Magnetism 5 (1900): 59-62.
Otto Toepfer & Sohn, Neue transportable Feinregistrir-Einrichtung für Erdmagnetismus (Potsdam, 1903).
Daniel Hazard, Results of Observations Made at the Coast and Geodetic Survey Magnetic Observatory at Baldwin, Kansas, 1901-1904 (Washington, D.C., 1909), pp. 10-11.
Location
Currently not on view
Object Name
variometer
Physical Description
metal (overall material)
Measurements
overall: 19 in; 48.26 cm
Place Made
Deutschland: Brandenburg, Potsdam
ID Number
1982.0671.12a
accession number
1982.0671
catalog number
1982.0671.12a
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 the Interior, U.S. Geological Survey

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