Dip Circle

Description
This Kew pattern dip circle is marked "U.S.C.&G.S. No. 23" and was probably made in the instrument shop of the U.S. Coast and Geodetic Survey. The vertical circle is silvered, graduated to 30 minutes, and read by opposite verniers and magnifiers to single minutes. The horizontal circle is graduated to 30 minutes and read by vernier to single minutes. On top of the box there is a compass needle in a box with peep sights that measures magnetic variation.

A brass housing on the front of the instrument holds an auxiliary needle (now missing) that serves as a deflector for the determination of total intensity; this technique was introduced by Humphrey Lloyd, professor of natural philosophy at Trinity College, Dublin, in the early 1840s.

Ref: Daniel Hazard, Directions for Magnetic Measurements (Washington, D.C., 1911), pp. 66-69.

Humphrey Lloyd, "On a New Magnetical Instrument, for the Measurement of the Inclination, and Its Changes," Proceedings of the Royal Irish Academy 2 (1840-1844): 210-217, 226-232.

Location
Currently not on view
maker
U.S. Coast and Geodetic Survey
Place Made
United States: District of Columbia, Washington
Physical Description
metal (overall material)
Measurements
overall: 10 1/2 in; 26.67 cm
overall in case: 12 in x 9 3/8 in x 8 1/4 in; 30.48 cm x 23.8125 cm x 20.955 cm
ID Number
PH.314632
accession number
208213
catalog number
314632
Credit Line
U.S. Coast & Geodetic Survey
subject
Science & Scientific Instruments
Science & Scientific Instruments
See more items in
Medicine and Science: Physical Sciences
Measuring & Mapping
Science & Mathematics
Data Source
National Museum of American History, Kenneth E. Behring Center

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