Magnetometer
date: label: Date made
content: 1873-1883
name: label: maker
content: Grunow, William
notes: label: Description
content: Johann von Lamont, director of the astronomical and meteorological observatory at Bogenhausen, introduced this type of theodolite magnetometer in the 1840s. This example marked "Wm. Grunow, New York" belonged to the U.S. Military Academy at West Point and probably dates from the period 1873-1883. William Grunow was a native of Berlin who, together with his brother Julius, immigrated to the United States in 1849 and made microscopes in New York, New Haven, and again New York. When the partnership dissolved in the late 1860s, William began making instruments for physics research. He moved to West Point in 1883.
label: Description
content: <p>Ref: D. J. Warner, "Julius & William Grunow," <i>Rittenhouse</i> 3 (1989): 41-48.</p><p>Johann von Lamont, <i>Handbuch des Erdmagnetismus</i> (Berlin, 1849).</p>
label: Location
content: Currently not on view
place: label: Place Made
content: United States: New York
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 Defense, U.S. Military Academy
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: PH.316428
label: accession number
content: 223721
label: catalog number
content: 316428
objectType: label: Object Name
content: magnetometer
physicalDescription: label: Physical Description
content: metal (overall material)
label: Measurements
content: horizontal circle: 11 in; 27.94 cm
label: Measurements
content: horizontal scale: 36 in; 91.44 cm
label: Measurements
content: suspension: 36 in; 91.44 cm
label: Measurements
content: overall; long case: 6 in x 44 in x 10 5/8 in; 15.24 cm x 111.76 cm x 26.9875 cm
label: Measurements
content: overall; large case: 18 1/2 in x 13 3/4 in x 14 1/4 in; 46.99 cm x 34.925 cm x 36.195 cm