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Date: |
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Description: | ?3366 [broad arrow]?
?J.H. Steward. Ltd. London?
The sextant consists of circular anodized brass plates with a lid that when screwed on the back of the instrument serves as the handle. The lid contains a paper table for natural tangents to the power of 100. The index arm is moved by a milled knob on the upper plate. The sextant has two index shades, in red and green, which are moved by levers. Index-glass adjustment is made by a screw and on the horizon-glass by square headed screws with a key shipped in the upper plate.
Attached to the sextant is a single lens magnifier on a 57mm swivelling arm attached at the pivot. The telescope is 50 mm in length with an erect image, and is fitted in the body of the instrument. It has a red shaded eyepiece and a pinhole sight shutter is fitted for use when the telescope is removed.
The instrument has an inlaid silver scale from -5� to 135� by 30 arcminutes, measuring to 117� (the digits are read from the pivot). The sextant has a silver vernier measuring to 1 arcminute, with zero at the left.
The sextant has no box or case.
AUDIT - object needs marking with its ID number and 1 part numbered. Inscription.
caption: Pocket Sextant
caption: Pocket Sextant Lid
caption: unavailable | Publisher: | "http://collections.rmg.co.uk/" | Rights holder: | "Royal Museums Greenwich" | Subjects: | box sextants Sextant Vernier J.H. Stewart Ltd | Source: | Royal Museums Greenwich | Identifier: | http://collections.rmg.co.uk/collections... | Go to resource |
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