Dip Circle
date: label: Date made
content: ca 1874
name: label: maker
content: Kahler
notes: label: Description
content: This is one of eight dip circles that Edward Kahler made for the American expeditions sent to observe the transit of Venus across the face of the sun in 1874. It is marked "106." The vertical circle is graduated to 20 minutes. The horizontal circle is graduated to 30 minutes and read by vernier to single minutes. Both are silvered.
label: Description
content: Ref: Steve Dick, <i>Sky and Ocean Joined</i> (Cambridge, 2002), p. 250.
label: Location
content: Currently not on view
place: label: Place Made
content: United States: District of Columbia, Washington
topic: label: Subject
content: Science & Scientific Instruments
setName: label: See more items in
content: Medicine and Science: Physical Sciences
label: See more items in
content: Science & Mathematics
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content: Measuring & Mapping
creditLine: label: Credit Line
content: U.S. Department of Defense, Dept. of the Navy, U.S. Naval Observatory
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: PH.327714
label: catalog number
content: 327714
label: accession number
content: 283554
objectType: label: Object Name
content: Dip Circle
physicalDescription: label: Physical Description
content: wood (overall material)
label: Physical Description
content: metal (overall material)
label: Measurements
content: vertical circle: 6 in; 15.24 cm
label: Measurements
content: horizontal circle: 4 1/2 in; 11.43 cm
label: Measurements
content: overall in case: 11 1/8 in x 11 in x 11 3/16 in; 28.2575 cm x 27.94 cm x 28.41625 cm