Box type pocket sextant.

Made:
1845-1855 in England
Pocket box sextant, unsigned, English, 1845-1855

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Pocket box sextant, unsigned, English, 1845-1855
Science Museum Group
© The Board of Trustees of the Science Museum

Pocket box sextant, unsigned, English, 1845-1855. Consists of two circular lacquered brass plates with lid that acts as a handle when used. Fitted with Inlaid silver 124° scale (-5° to 145°) with 30' divisions and a silver vernier (1' div.). The index arm is rotated by a milled knob on the upper plate with two filter shades (red & green) operated by lever. The index glass is fixed with adjustment for the horizon glass. Fitted with magnifier (single lens) on hinged 35 mm swivel arm and choice of a large and a small pinhole sight but telescope missing.

Details

Category:
Surveying
Collection:
Sir Henry Wellcome's Museum Collection
Object Number:
1979-272
Materials:
glass and brass (copper, zinc alloy)
type:
box sextant
credit:
On loan from the Wellcome Trust