A Late 18th/Early 19th century Ebony and Brass Octant lacquered brass fittings, with handle telescope socket, three shades and mirrors, the index arm 27 cm radius with vernier tangent screw and clamp, the arc with a metal scale, in shaped teak case with trade label E.A Patterson, East India Road, Poplar. The cover with a brass plaque engraved William C. Harrison R.N.