ȘOLD Featured below is a rare example of genuine octant used by explorers for navigation on the sea. This is an excellent ebony frame 12inch radius octant made by Spencer Browning and Rust, London in the first quarter of 1800 (the initials still present of the bone Vernier) and sold by John Eshelby. The device has most of the parts in place: a bone scale divided 0-100º, brass index arm, tangent-screw with clamp, a pinhole sight 3 sun shades, two horizon shades, one index and one horizon mirror, and three brass legs and a nice fan shaped case. The case has some wear and tear due to the age and a crack on the bottom.. Just a few things got lost over time the bone vernier from the index arm, top crayon and the dealers name plate from the middle of the frame.
The device will make an excellent addition to your collection of early navigational instruments.