Diamond-frame pattern sextant with case.

Made:
1845-1855
maker:
John James Messer

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Diamond-frame pattern sextant. Messer, John James 1845-1860 Sextant, by Messer, in fitted case, no key. Hand magnifier
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Brass sextant with polished brass diamond-pattern frame and limb, with wooden handle in fitted mahogany keystone case by John James Messer, London, England, 1845-55. Consists of inlaid polished silver 131° scale (-5° to 145°) with 15’ divisions and silver vernier (15”), four index-filter shades (red & green), three horizon filters (orange), scale magnifier on 90mm swivelling arm. Fitted with threaded telescope bracket for sighting telescopes (84mm – erect image & 146mm – inverted image) and sighting tube (83mm).

Details

Category:
Navigation
Object Number:
1933-12
type:
trade card
taxonomy:
  • furnishing and equipment
  • measuring device - instrument
  • component - object
  • instrument component
  • visual and verbal communication
  • advertising card
credit:
British Astronomical Association

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