This has an ebony frame, a reinforced brass index arm, an ivory scale that is graduated every 20' from -2° to +107° and read by vernier with tangent screw to 30" of arc. The inscription reads "Spencer Browning & Co London. Made for D. McGregor & Co Glasgow & Greenock." Spencer Browning & Co. were in business from 1840 to 1870.
Western Union transferred this sextant to the Smithsonian in 1972.
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