Antique Octant by Langford & Son, Bristol.
A mid 19th century navigators Octant made by LANGFORD & SON, BRISTOL with applied makers plate.
The Octant’s double ‘T’ shaped frame is constructed from ebony with brass fittings and ivory scales. The arc scale is crisp and clearly engraved, reading from -3 degrees to 109 degrees and further divided into 20 minutes of arc. This Octant can measure angles of up to 92 degrees.
This Octant comes with two telescopes, press on telescope sun filter and mirror adjusting tool. It is also fitted with a hardwood handle and has both index mirror sun shades and horizon mirror sun shades.
This Octant has a braced brass index arm, which is fitted with an ivory Vernier scale engraved from 0 to 20 and reading 1 minute of arc. There is a clamping screw to the reverse side with a fine adjustment tangent screw off to the side.
The ivory makers plaque is situated on the crossbar of the octant frame and is engraved LANGFORD & SON, BRISTOL. William Langford is recorded as working from an address in Bristol from 1828 to 1873.
This Octant is complete with its original wooden, keystone shaped mahogany box.
Height of Octant: 11 inches / 28 cm - Radius of Octant: 9 inches / 23 cm.
Front side of the antique octant with telescopes, eye piece filter and mirror adjusting tool.
A close up of the antique octant showing ivory scale and index arm Vernier.
Close up of the ivory makers plaque.
Close up of the octant's Vernier and tangent screw.
Exterior of the hardwood octant carrying case / storage box.
Close up of mirror adjustment to the rear of the Octant.
Reverse side of the antique octant and accessories.