Double sounding sextant.

Made:
1845-1851
modifier:
Nathaniel Worthington

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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

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

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

Double sounding sextant with anodized brass circle-pattern frame and polished brass limb with wooden handle in fitted mahogany box containing in the lid a trade label for J.D. Potter, 31 Poultry London, invented by Rear Admiral Frederick Beechey and made by Nathaniel Worthington, London, 1845-1851. Fitted with two parallel inlaid silver scales marked; (lower) -2° from left to155° with 20 arc-min. divisions to 129° and (upper) -10° at right to147° with same to 126°; each with silver vernier scale divided to 20 arc-min.; four index shades (3 red, 1 green), no horizon shades; two index glasses; upper magnifier (single lens) on a 55 mm swivelling arm and lower one on a bar and bracket for telescope (62 mm, large objective) erect image (other telescope missing) with perpendicular adjustment. Accessories include magnifying glass; adjusting key; adjusting pin.

Details

Category:
Surveying
Object Number:
1876-990
Materials:
brass (copper, zinc alloy), felt, glass, mahogany (wood), paper (fibre product) and steel (metal)
type:
sounding sextant
taxonomy:
  • furnishing and equipment
  • measuring device - instrument
  • sextant
  • furnishing and equipment
  • measuring device - instrument
credit:
Admiralty Hydrographic Department