Details
An early 19th century vernier octant
In ebony and brass (lacking makers plaque), the inset ivory scale divided 5°--0°--105°, the vernier from 20°--0° (clamp screw missing) with tangent screw adjustment; pin hole sights; (shades missing); two mirrors, radius -- 8¼in. (21cm.) (old wear)
See illustration
In ebony and brass (lacking makers plaque), the inset ivory scale divided 5°--0°--105°, the vernier from 20°--0° (clamp screw missing) with tangent screw adjustment; pin hole sights; (shades missing); two mirrors, radius -- 8¼in. (21cm.) (old wear)
See illustration