Universal Magnetometer with Earth Inductor
name: label: maker
content: Edelmann, Max Thomas
notes: label: Description
content: This instrument combines a theodolite to determine latitude, azimuth, and time; a magnetometer to determine declination and horizontal intensity; and an earth inductor and galvanometer to determine dip. The inscriptions read "Edelmann, Munchen" and "U.S.C. & G.S. No. 22."
label: Description
content: The form was designed in the early 1890s by Heinrich Wild, a Swiss scientist who spent much of his career directing the Russian magnetic and meteorological observatory at Pavlovsk. This example was built by Max Thomas Edelmann (1845-1913), an accomplished instrument maker in Munich. Both men had made major contributions to the development of earth inductors. The U.S. Coast and Geodetic Survey installed instruments of this sort in its several magnetic observatories around 1901. This one was used at Honolulu until 1927.
label: Description
content: The horizontal circle is 30 cm in diameter and read directly to 2 seconds by micrometer microscopes.
label: Description
content: Ref: H. Wild, "Beiträge zur Entwicklung der magnetische Beobachtungsinstrumente," <i>Repertorium für Meteorologie</i> (1893), vol. 17, no. 6.
label: Description
content: M. Th. Edelmann, "On the Construction of Earth-Magnetic Instruments," <i>Weather Bureau Bulletin</i> 11 (1893): 522-550, on 528-529.
label: Description
content: H. Wild, "Theodolit für magnetische Landesaufnahmen," <i>Vierteljahrschrift der Naturforschenden Gesellschaft in Zürich </i>(1896), vol. 2, pp. 149-173.
label: Description
content: Daniel Hazard, <i>Results of Observations Made at the Coast and Geodetic Survey Magnetic Observatory Near Honolulu, Hawaii, 1902-1904</i> (Washington, D.C., 1909), pp. 12-13.
label: Location
content: Currently not on view
place: label: Place Made
content: Germany: Bavaria, Munich
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 Commerce, Coast & Geodetic Survey
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: PH.316518
label: accession number
content: 225703
label: catalog number
content: 316518
objectType: label: Object Name
content: Universal Magnetometer with Earth Inductor
physicalDescription: label: Physical Description
content: metal (overall material)
label: Measurements
content: box: 28 1/2 in x 13 in x 12 in; 72.39 cm x 33.02 cm x 30.48 cm
label: Measurements
content: overall in case: 12 1/8 in x 28 3/4 in x 13 in; 30.7975 cm x 73.025 cm x 33.02 cm