Brass framed sextant with case.

Made:
1775-1782 in London
maker:
Joshua Lover Martin

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Science Museum Group Collection
© The Board of Trustees of the Science Museum

Science Museum Group Collection
© The Board of Trustees of the Science Museum

Science Museum Group Collection
© The Board of Trustees of the Science Museum

Science Museum Group Collection
© The Board of Trustees of the Science Museum

Brass sextant with two-plate frame, attached by 47 screws with wooden handle and fitted wooden keystone case with textile lining, by Joshua Lover Martin, London, England, 1775-1782. Consists of polished brass 122° scale (-5° to 125°) with vernier (1’), three index-filter shades (red, green & orange), two horizon filters (orange. Fitted with threaded bracket for sighting telescope (129mm – erect image & 160 – inverted image) and sighting pinhole vane.

Details

Category:
Astronomy
Object Number:
1907-94
type:
sextant
taxonomy:
  • furnishing and equipment
  • measuring device - instrument
  • component - object
  • instrument component
credit:
J.C. Stevens Auction House