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Octant made by Spencer, Barrett & Co., London, circa 1820
octant
INSTRUMENTS - OCTANTSSpencer Barrett & Co.
England, London
circa 1820
overall: 13 1/4 x 10 5/8 x 3 in.
Octant; ebony frame, reinforced brass index arm; ivory nameplate marked "SPENCER . BARRETT . & . Co./ LONDON", date: ca 1820; ivory scale graduated -2 degrees to +108 degrees by 1 degree subdivided to 20'; ivory vernier; adjustable index mirror with three fixed shades; horizon glass with screw adjustment; sight vane with double peep and pivoted cover; pencil hole in brase; three brass legs; in keystone box 1989.111.3. Trade label for Robert King, NY (established 1816).
1989.111.2