Viewing telescope for Hadley type brass framed sextant

Made:
c. 1772 in London
maker:
Jesse Ramsden
Jesse Ramsden sextant. Full view, graduated matt black perspex background. Jesse Ramsden sextant. detail view of mirrors and coloured filters. Jesse Ramsden sextant. Detail view of measurment scale. Black background.

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Jesse Ramsden sextant. Full view, graduated matt black perspex background.
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Jesse Ramsden sextant. detail view of mirrors and coloured filters.
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Jesse Ramsden sextant. Detail view of measurment scale. Black background.
Science Museum Group Collection
© The Board of Trustees of the Science Museum

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

One of two removeable viewing telescopes for Sextant, 15-inch, by Jesse Ramsden, London, c 1775. Type of Hadley's sextant supplied by Ramsden for Captain Cook's second and third voyages, 1772 and 1776.

Details

Category:
Astronomy
Object Number:
1928-924 Pt3
Materials:
brass, copper (alloy), glass, mahogany, metal and wood
type:
sextant
taxonomy:
  • component - object
  • furnishing and equipment
  • measuring device - instrument
credit:
Mr Thomas H. Court