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Date: |
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Description: | ?10?
?H.O. 10?
The sextant has a black-lacquered brass curve-pattern frame and a wooden handle. The tangent screw and clamping screw are on the back of the index arm. The instrument has no shades. Index-glass adjustment is made by a capped screw and on the horizon-glass by a square-headed screw, a detached key and a capped screw.
Attached to the sextant is a magnifier on a 45mm swivelling arm. There is also a threaded telescope bracket without adjustment. The telescope is 77 mm in length with an erect image and a wide objective lens (star finder). It has a detached sight vane with one pinhole and a milled adjusting key.
The instrument has a polished brass limb with an inlaid silver scale from -5� to 155� by 30 arcminutes, measuring to 132�. The sextant has a silver vernier measuring to 1 arcminute, with zero at the right.
The sextant is contained in a square fitted wooden box marked ?H.O. [broad arrow] 10?, and containing in the lid a trade label for Cary, Porter, Ltd, 7 Pall Mall, London. H.O. stands for Hydrographic Office
AUDIT - 4 parts needing numbering. Possible corrosion. Inscription.
caption: Night Sextant - Front
caption: Night Sextant - Back
caption: Night Sextant - Box Inside
caption: Night Sextant - Box Lid | 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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