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LicenseOctant 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.
