Brass framed octant.

Octant made by Benjamin Cole (I), London, about 1760

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Octant made by Benjamin Cole (I), London, about 1760
Science Museum Group
© The Board of Trustees of the Science Museum

Octant made by Benjamin Cole (I), London, about 1760. Lacquered brass frame and limb. Signed on the limb: B. Cole Maker at No. 136 Fleet Street London. Brass scale from -5° to 95° every 20', measuring to 93°. Brass vernier to 1', zero at the centre. There is no tangent screw; the clamping screw is on the back of the index arm. Two socket shades (both red). Index glass without adjustment; adjustment of the horizon glasses by screws, and by levers, wing nuts and milled clamping screws. The sight vane has one pinhole; the back sight vane is missing (broken). No box.

Details

Category:
Astronomy
Object Number:
1923-474
Materials:
brass, glass and complete
Measurements:
overall (estimate): 70 x 440 x 380 mm
type:
octant
credit:
Cooke, Troughton and Simms Limited