Dip Circle

Description
The Department of Terrestrial Magnetism of the Carnegie Institution of Washington purchased this Lloyd-Creak circle in 1904. It is marked "Dover, Charlton Kent. Circle 169." With gimbal stand it cost $527. The vertical circle is silvered, graduated to 30 minutes, and read by opposite verniers to single minutes. The horizontal circle is silvered, graduated to 30 minutes, and read by vernier to single minutes. An auxiliary needle on top is used to determine magnetic declination.

Ref: Carnegie Institution of Washington. Department of Terrestrial Magnetism, Land Magnetic Observations, 1905-1910 (Washington, D.C., 1912), p. 47.

Location
Currently not on view
Date made
ca 1904
maker
Dover
Place Made
United Kingdom: England, London, Charlton
Physical Description
metal (overall material)
wood (part material)
Measurements
vertical circle: 10 1/2 in; x 26.67 cm
ID Number
1983.0039.01
accession number
1983.0039
catalog number
1983.0039.01
Credit Line
Carnegie Institution of Washington
subject
Science & Scientific Instruments
Science & Scientific Instruments
See more items in
Medicine and Science: Physical Sciences
Science & Mathematics
Measuring & Mapping
Data Source
National Museum of American History, Kenneth E. Behring Center

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