Spencer Browning & Co. Sextant

Spencer Browning & Co. Sextant

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Usage conditions apply
This sextant is somewhat unusual in that it has a brass frame, reinforced brass index arm, and ivory (rather than metal) scale. This scale is graduated every 20 minutes from -5° to +125° and read by vernier with tangent screw and swinging magnifier to 30 seconds of arc. The "Spencer Browning & Co., London" inscription on the arc refers to a firm that was in business from 1840 to 1870.
Currently not on view
Object Name
date made
Spencer, Browning & Co.
place made
United Kingdom: England, London
Physical Description
ivory (overall material)
brass (overall material)
mahogany (overall material)
glass (overall material)
radius: 7 1/2 in; 19.05 cm
overall: 4 7/8 in x 11 1/2 in x 11 1/4 in; 12.3825 cm x 29.21 cm x 28.575 cm
ID Number
catalog number
accession number
Credit Line
George T. Blair
See more items in
Medicine and Science: Physical Sciences
Measuring & Mapping
Data Source
National Museum of American History
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