White Azimuth Mirror

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Description
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, that Thomson introduced in the early 1880s. It was made before 1892 when Thomson became Lord Kelvin. The inscriptions read "J. WHITE GLASGOW" and "SIR W THOMSON’S PATENT No 2673." The U.S. Naval Observatory transferred it to the Smithsonian in 1966.
Ref: William Thomson, "Device for Taking Azimuths," U.S. Patent #210,068.
William Thomson, "Azimuth Instrument," U.S. Patent #402,364.
Location
Currently not on view
patentee
Thomson, William
maker
White, James
Measurements
box: 6 3/4 in x 10 1/4 in x 4 7/8 in; 17.145 cm x 26.035 cm x 12.3825 cm
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
ID Number
PH.336602
catalog number
336602
accession number
283654
Credit Line
U.S. Naval Observatory
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Data Source
National Museum of American History, Kenneth E. Behring Center

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