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Date: |
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Description: | ?Cary, London?
The sextant has a black-lacquered bronze straight-bar pattern frame and a wooden handle with a brass-lined hole for placing it on a stand. The tangent screw and clamping screw are on the back of the index arm. The instrument has four green shades and three green horizon shades. Index-glass adjustment is made by a screw and on the hinge-mounted horizon-glass by a capped milled screw.
Attached to the sextant is a magnifier on a 75mm swivelling arm with a frosted glass shade and a brass tube for holding a light. There is also a threaded telescope bracket in two parts, fitted for correcting collimation error. It has perpendicular adjustment by a rising-piece and a milled knob. The telescope is 232 mm in length with an inverted image, which is focused by a milled knob. An extra drawtube is 49 mm long with an inverted image and two parallel cross wires. A second telescope is 84 mm long with an erect image (star finder). It has two green shaded eyepieces, an adjusting pin and a light for the scale, the latter of which is missing.
The instrument has a polished bronze limb with an inlaid gold scale from -5� to 154� by 10 arcminutes, measuring to 129�. The sextant has a platinum vernier measuring to 10 arcseconds, with zero at the right.
The sextant is contained in a square fitted box with an inlaid plate that is now missing from the lid. The lid contains a Class A National Physical Laboratory certificate of examination, dated May 1914.
AUDIT - five unnumbered parts.
caption: Sextant - Front
caption: Sextant - Back
caption: Sextant - Inscription
caption: Sextant - Box
caption: unavailable | Publisher: | "http://collections.rmg.co.uk/" | Rights holder: | "Royal Museums Greenwich" | Subjects: | Sextant Vernier sextants | Source: | Royal Museums Greenwich | Identifier: | http://collections.rmg.co.uk/collections... | Go to resource |
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