Surveyor's pocket sextant.

Made:
1795-1805 in Strand
maker:
William Cary
Pocket sextant by Cary, 1795-1805. Black and white photograph, taken in 1948, from the Science Museum photographic

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Pocket sextant by Cary, 1795-1805. Black and white photograph, taken in 1948, from the Science Museum photographic
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Surveyor's pocket sextant made by William Cary, London, about 1800. Lacquered brass frame, polished limb, a detachable wooden handle. Signed on the crossbar: Cary London. Brass scale from -5° to 150° every 1°, measuring to 125° (digits read from the pivot). Brass vernier to 1', zero at the left. There is no tangent or clamping screw; no shades. Index glass without adjustment; adjustment of the horizon glass by a fixed milled screw. Sight vane with one pinhole. Wooden keystone box containing in the lid a label of the Geological Survey of Great Britain marked in MS: H.W. Bristow | 28 Jermyn Street | SW [and] agenda | 6747. Used for field mapping during the Peninsular War, 1808-1814.

Details

Category:
Surveying
Object Number:
1876-1034
Materials:
base, mahogany, sextant, brass and sextant, glass
type:
surveyor's sextant
taxonomy:
  • furnishing and equipment
  • measuring device - instrument
  • sextant
  • furnishing and equipment
  • measuring device - instrument
  • sounding sextant
credit:
Bristow, H.W.