Magnetometer
name: label: maker
content: Bausch, Lomb, Saegmuller Co.
notes: label: Description
content: The Department of Terrestrial Magnetism of the Carnegie Institution of Washington designed this type of theodolite magnetometer by combining the best features of the Coast and Geodetic Survey instrument and that used on the Magnetic Survey of India. Bausch, Lomb, Saegmuller Co. made several instruments of this sort. This example is marked "B & L Z S ROCHESTER, N.Y. 6790" and "No. 8." The "Z" in the inscription refers to the Carl Zeiss works in Jena, a Bausch & Lomb affiliate.
label: Description
content: Internal records indicate that the D.T.M. purchased this example in 1908, for a cost of $616.50. In early 1918, it was modified for use in extremely cold climates: some of its elements were sealed to avoid condensation, and the parts frequently touched were covered with celluloid. It was then used on the "Maud" expedition that Roald Amundsen led to the Arctic in 1918-1921; the second Amundsen expedition to the Arctic in 1922-1925; the Byrd expedition to the Antarctic in 1928-1930; and the United States expedition to the Antarctic in 1939-1941. The U.S. Coast and Geodetic Survey borrowed it for the Nanook expedition in 1946, and did not return it to the D.T.M. The U.S. Geological Survey acquired this instrument when it took over the geomagnetic program of the federal government, and transferred it to the Smithsonian in 1982.
label: Description
content: Ref: Bausch, Lomb, Saegmuller Co., <i>Astronomical, Engineering and Other Instruments of Precision</i> (Rochester, N.Y., 1907), pp. 42-43.
label: Description
content: J. A. Fleming, "Comparisons of Magnetic Observatory Standards by the Carnegie Institution of Washington," <i>Terrestrial Magnetism</i> 16 (1911): 61-84, on 62-63.
label: Description
content: H. U. Sverdrup,"Magnetic, Atmospheric-Electric, and Auroral Results, Maud Expedition, 1918-1925," in Carnegie Institution of Washington. Department of Terrestrial Magnetism. <i>Land Magnetic and Electric Observations, 1918-1926</i>(Washington, D.C. 1927), pp. 309-524, on 313-316.
label: Location
content: Currently not on view
place: label: Place Made
content: United States: New York, Rochester
topic: label: Subject
content: Science & Scientific Instruments
label: Subject
content: Science & Scientific Instruments
setName: label: See more items in
content: Medicine and Science: Physical Sciences
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content: Science & Mathematics
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content: Measuring & Mapping
creditLine: label: Credit Line
content: U.S. Department of the Interior, U.S. Geological Survey
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 1982.0671.11
label: accession number
content: 1982.0671
label: catalog number
content: 1982.0671.11
objectType: label: Object Name
content: magnetometer
physicalDescription: label: Physical Description
content: metal (overall material)
label: Measurements
content: overall: 26 3/4 in x 14 in x 7 3/4 in; 67.945 cm x 35.56 cm x 19.685 cm
label: Measurements
content: overall in case: 7 1/4 in x 26 1/4 in x 13 1/2 in; 18.415 cm x 66.675 cm x 34.29 cm