Brass framed sextant.

Made:
1790-1800 in Piccadilly
maker:
Jesse Ramsden

Brass sextant with polished frame and limb, by Jesse Ramsden, London, England, 1790-1800. Fitted with hinged stand instead of handle, which can be fitted to threaded hole on the lid of the case. Consists of inlaid silver 129° scale (-2° to 147°) with 20’ divisions, a silver vernier reading to 20”, three filter shades (two red, one green), three horizon shades (two red, one green) and scale magnifier on swivel arm (missing). Fitted with threaded telescope bracket (with detachable dovetail) for telescope (123 mm, set focus?) inverted image, four cross-wires and sight tube (51 mm).

On display

Science Museum: Mathematics: The Winton Gallery

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Details

Category:
Navigation
Object Number:
1974-619/1
type:
sextant
taxonomy:
  • furnishing and equipment
  • measuring device - instrument
credit:
Meteorological Office

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