Hadley type brass framed sextant with case.

Made:
1770-1775 in Piccadilly
maker:
Nevil Maskelyne
and
Jesse Ramsden

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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

Jesse Ramsden sextant. Cropped view for gallery use. Graduated matt black perspex background.
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Engraving detail on Sextant, 15-inch with two removable viewing telescopes, by Jesse Ramsden, London, c 1775. Type of
Science Museum Group Collection
© The Board of Trustees of the Science Museum, London

Engraving detail on Sextant, 15-inch with two removable viewing telescopes, by Jesse Ramsden, London, c 1775. Type of
Science Museum Group Collection
© The Board of Trustees of the Science Museum, London

Sextant, 15-inch with two removable viewing telescopes, by Jesse Ramsden, London, c 1775. Type of Hadley's sextant
Science Museum Group
© The Board of Trustees of the Science Museum, London

Sextant, 15-inch with two removable viewing telescopes, by Jesse Ramsden, London, c 1775. Type of Hadley's sextant
Science Museum Group
© The Board of Trustees of the Science Museum, London

Sextant, 15-inch with two removable viewing telescopes, by Jesse Ramsden, London, c 1775. Type of Hadley's sextant
Science Museum Group
© The Board of Trustees of the Science Museum, London

Sextant, 15-inch with two removable viewing telescopes, by Jesse Ramsden, London, c 1775. Type of Hadley's sextant
Science Museum Group
© The Board of Trustees of the Science Museum, London

Brass sextant with polished frame and limb, wooden handle in fitted mahogany keystone case, by Jesse Ramsden, London, England, 1770-75. Consists of polished brass 120° scale (-2° to 136°) with 20’ divisions and brass vernier (30”), three index-filter shades (red & green), one horizon filter (red). Fitted with threaded telescope bracket for sighting telescope (130mm –inverted image). The same type of sextant was supplied by Ramsden for Captain Cook's second and third voyages, 1772-75 and 1776-79.

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Details

Category:
Astronomy
Object Number:
1928-924
type:
sextant
taxonomy:
  • furnishing and equipment
  • measuring device - instrument
  • component - object
  • instrument component
credit:
Mr Thomas H. Court

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