Octant made by Spencer, Barrett & Co., London, circa 1820

octant

INSTRUMENTS - OCTANTS
Spencer Barrett & Co.
England, London
circa 1820
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