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Description: | HEZZANITH OBSERVATORY / LONDON / The "Hezzanith" Observatory Works, / LONDON / CERTIFICATE OF EXAMINATION?
S 31
WILSON, FLETCHER, BRUCE & SONS L.TD CARDIFF. BARRY DOCK. NEWPORT & SWANSEA.
The sextant has an anodized brass three-circle pattern frame and a wooden handle. The tangent screw and clamping screw are positioned on the back of the index arm and a protective brass cylinder covers the thread. The instrument has four shades, two red, one green, and one blue, and three horizon shades in blue, green, and red. Index-glass adjustment is made by a screw and on the horizon-glass by capstan screws.
Attached to the sextant is a magnifier on an 85mm swivelling arm with a frosted glass shade. There is also 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 181 mm in length with an inverted image and four cross wires. A second telescope is 68 mm long with an erect image (star finder). The sight-tube is 85 mm in length with a fitted green shade, an adjusting pin, and a shaded eyepiece, which is missing.
This instrument has polished brass limb with inlaid silver scale from -5� to 156� by 10 arcminutes, measuring to 129�. 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, containing in the lid a Hezzanith Observatory Works certificate of examination, dated January 1920.
Pockett?s was a longstanding family-owned Greenwich pawnbroker, which in the late nineteenth and early twentieth century lent money against instruments to officers at the Royal Naval College. Pockett?s lasted as a souvenir shop into the 1980s.
AUDIT - Object needs marking with NAV number and 4 parts need numbering.
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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