Universal Magnetometer with Dip Circle
name: label: maker
content: Tesdorpf
notes: label: Description
content: This instrument combines a magnetometer, a declinometer, a dip circle, and a theodolite. It was designed by J. F. A. M. Eschenhagen, Director of the Prussian Magnetic Observatory at Potsdam, and made by Ludwig Tesdorpf in Stuttgart. The U.S. Coast and Geodetic Survey installed instruments of this sort in its several magnetic observatories in 1902, and used them to calibrate field instruments. This example was used at Sitka, Alaska.The inscriptions read "LUDW. TESDORPF STUTTGART N<sup>O</sup> 1810" and "U.S.C.&G.S. No. 25."
label: Description
content: Ludwig Tesdorpf began in business in 1861, specializing in instruments for astronomy and geodesy. American scientists could see Tesorpf instruments at the Columbian Exposition held in Chicago in 1893 and at the World's Fair held in St. Louis in 1904. By 1906 the firm had been acquired by Sartorius.
label: Description
content: Ref: K. Haussmann, "Der Magnettheodolit von Eschenhagen-Tesdorpf," <i>Zeitschrift für Instrumentenkunde</i> 26 (1906): 2-15.
label: Description
content: L. A. Bauer and J. A. Fleming, "Magnetic Observatories of the United States Coast and Geodetic Survey," <i>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</i>, Appendix No. 5, p. 330.
label: Location
content: Currently not on view
place: label: Place Made
content: Germany: Baden-Württemberg, Stuttgart
topic: 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.316505
label: accession number
content: 225703
label: catalog number
content: 316505
objectType: label: Object Name
content: universal magnetometer with dip circle
physicalDescription: label: Physical Description
content: metal (overall material)
label: Measurements
content: overall: large container: 13 in x 16 1/2 in x 9 5/8 in; 33.02 cm x 41.91 cm x 24.4475 cm
label: Measurements
content: overall: medium container: 7 3/4 in x 16 in x 8 1/8 in; 19.685 cm x 40.64 cm x 20.6375 cm
label: Measurements
content: overall: small container: 1 in x 19 in x 1 1/2 in; 2.54 cm x 48.26 cm x 3.81 cm