Azimuth Mirror
date: label: date made
content: early 20th century
name: label: maker
content: Kelvin & James White, Ltd.
notes: label: Description
content: William Thomson described a new "Marine Azimuth Mirror" at the 1877 meeting of the British Association for the Advancement of Science, and patented the design in Britain and the U.S. This instrument is an example of the improved design, with a reflecting prism in place of the original mirror. Thomson introduced this form in the early 1880s. The signature indicates that it was made during the period 1900-1913. The base bears the inscriptions "KELVIN & JAMES WHITE, LIMITED. GLASGOW" and "LORD KELVIN’S (SIR WM THOMSON) PATENTS No 5713." The U.S. Coast & Geodetic Survey transferred the instrument to the Smithsonian in 1929.
label: Description
content: Ref: William Thomson, "Device for Taking Azimuths," U.S. Patent #210,068.
label: Description
content: William Thomson, "Azimuth Instrument," U.S. Patent #402,364.
label: Location
content: Currently not on view
place: label: place made
content: United Kingdom: Scotland, Glasgow
setName: label: See more items in
content: Medicine and Science: Physical Sciences
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content: Navigation
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content: Measuring & Mapping
creditLine: label: Credit Line
content: U.S. Coast & Geodetic Survey
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: PH.309653
label: catalog number
content: 309653
label: accession number
content: 106954
objectType: label: Object Name
content: azimuth mirror
physicalDescription: label: Measurements
content: box: 6 13/16 in x 10 1/4 in x 4 3/4 in; 17.30375 cm x 26.035 cm x 12.065 cm
label: Measurements
content: overall: 9 in x 6 in x 2 in; 22.86 cm x 15.24 cm x 5.08 cm
label: Measurements
content: overall: 6 3/4 in x 10 1/4 in x 4 3/4 in; 17.145 cm x 26.035 cm x 12.065 cm