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Date: |
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Description: | The octant has an ebony frame and limb with a black-lacquered brass index arm and fittings. It has inlaid ivory plates on the crossbar and on the back of the frame. The tangent screw and clamping screw, which is a replacement, are located on the back of the index arm. The octant has three index shades, two red and one green. Index-glass adjustment is made by a screw and on the horizon glass by a lever, worm gear and a milled clamping screw. The sight vane has one pinhole. An ivory cap for a pencil is fitted in the crossbar. The octant has no box.
The instrument has an inlaid ivory scale from -8� to 106� by 20 arcminutes, measuring to 93�. The octant has an ivory vernier measuring to 1 arcminute, with zero at the right.
AUDIT - Object needs marking with NAV number.
caption: Octant - Front
caption: Octant - Back
caption: unavailable | Publisher: | "http://collections.rmg.co.uk/" | Rights holder: | "Royal Museums Greenwich" | Subjects: | Vernier octants Octant | Source: | Royal Museums Greenwich | Identifier: | http://collections.rmg.co.uk/collections... | Go to resource |
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