Embedded Files
ANTIQUE OCTANT.
ANTIQUE OCTANT.
A fine early 19th century navigators Octant made by Spencer Browning & Co, London with applied makers plate.
The Octant’s ‘T’ shaped frame is constructed from ebony with brass fittings and ivory scales. The arc scale is crisp and clearly engraved, reading from -2 degrees to 107 degrees. It is further divided into 20 minutes of arc and can measure angles of up to 90 degrees.
Double-hole sighting pinnula with swing cover. Concealed pencil compartment with screw on ivory cap.
The scale is also engraved SBR (Spencer Browning & Rust) near the 50 degree mark, this indicates that this Octant's ivory scale was made by Spencer Browning & Rust who produced navigation instruments from 1784 to 1840.
This Octant has the early flat and unbraced 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 Spencer Browning & Co, London. - Spencer Browning & Co are recorded as making navigational instruments from 1840 to 1870.
Height of Octant: 12 inches / 30 cm, Radius of Octant: 9.5 inches / 24cm. There is no box with this Octant.
Rear view of antique Octant.
Close up of the antique Octant scale and SBR initials (Spencer, Browning & Rust) engraved on the scale.
Close up of the antique Octant Vernier scale.
Close up of the Antique Octant manufacturers plate, Spencer. Browning & Co, London.
Close up of the antique Octant components.
Close up of the antique Octant components.
Close up of the antique Octant components.
Close up of the antique Octant components.
Page updated
Google Sites
Report abuse