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Description: | Hezzanith | Rapid-Reader | Patent [and] ?Hezzanith? | Endless Tangent Screw | Automatic Clamp. | Patent [and] Semper | Paratus?
?Heath & Co New Eltham, London S.E.9?
?Made in England | E 56?
The sextant has an anodized brass three-circle pattern frame and a wooden handle. The white plastic micrometer drum and a clamp are located at the bottom of the index arm. The instrument has four green shades and three green horizon shades. Index- and horizon-glass adjustment is made by capped capstan screws.
Attached to the sextant 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. The telescope is 172 mm in length with an inverted image and four cross wires. A second telescope is 73 mm long with an erect image and a wide objective lens (star finder). An extra drawtube is 96 mm long with two parallel cross wires. Accompanying the sextant is a sight-tube, which is 82mm in length, two green shaded eyepieces, an adjusting pin, and a spanner.
The instrument has a bronzed limb with an inlaid silver scale from -5� to 130� by 1�, measuring to 129�. Micrometer to 0.2 arcminutes.
The sextant is contained in a square fitted wooden box, with a National Physical Laboratory Teddington certificate of examination in the lid, dated 30 December 1939. There is an inlaid blank brass plate on the top of the lid.
AUDIT - five unnumbered parts.
caption: Sextant
caption: Sextant - Back
caption: Sextant - Inscription
caption: Sextant - Box
caption: Sextant - Box Label | Publisher: | "http://collections.rmg.co.uk/" | Rights holder: | "Royal Museums Greenwich" | Subjects: | Sextant sextants | Source: | Royal Museums Greenwich | Identifier: | http://collections.rmg.co.uk/collections... | Go to resource |
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