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Date: |
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Description: | ?I. D. Potter Poultry & Tower Hill, London?
The quintant has a varnished brass diamond-pattern frame with a wooden handle. The tangent screw and clamping screw are located 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 horizon glass by capstan screws, a square-headed screw and a detached key.
Attached to the quintant is a threaded telescope bracket in two parts, fitted for correcting collimation error. It has perpendicular adjustment made by a rising-piece and a milled knob. There is also a magnifier on an 83mm swivelling arm. The telescope is 187 mm in length with an inverted image and two parallel cross-wires. An extra drawtube is 79 mm long with an inverted image and four cross wires. A second telescope is 82 mm long with an erect image. Accompanying the quintant is a sight-tube which is 81 mm in length, two green shaded eyepieces, an adjusting pin, a milled adjusting key, and a magnifying glass marked ?E M?.
The instrument has a polished brass limb with an inlaid silver scale from -5� to 165� by 10 arcminutes, measuring to 145�. The quintant has a silver vernier measuring to 10 arcseconds, with zero at the right.
The quintant is contained in a mahogany keystone box, with a trade label in the lid for J. B. Potter, successor to R. B. Bate, and a card of Staff Commander Edward Mourilyan RN marked in handwriting, ?A Remembrance from the [Mourilyan] family to Edgar Tarry Adams?.
AUDIT - object needs marking with its ID number and 7 parts numbered. Inscription.
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: | Vernier Quintant sextants | Source: | Royal Museums Greenwich | Identifier: | http://collections.rmg.co.uk/collections... | Go to resource |
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