Details
A late 18th Century vernier octant by Bleuler
constructed in ebony, brass and ivory, signed across the 'T' bar I. BLEULER LONDON, the inset ivory scale divided 2- 0- 100, vernier clamp, double pin-hole sight, back sight, three interchangeable shades, mirrors and brass feet, the radius -- 15in. (39.4cm.)
See illustration