Brass framed sextant.

Made:
1790-1800 in Piccadilly
maker:
Jesse Ramsden
Brass framed sextant. (sextant) Brass framed sextant. (sextant) Brass framed sextant. (sextant) Brass framed sextant. (sextant) Brass framed sextant. (sextant) Brass framed sextant. (sextant)

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Creative Commons LicenseThis image is released under a CC BY-NC-SA 4.0 Licence

Buy this image as a print 

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License this image for commercial use at Science and Society Picture Library

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Creative Commons LicenseThis image is released under a CC BY-NC-SA 4.0 Licence

Buy this image as a print 

Buy

License this image for commercial use at Science and Society Picture Library

License

Creative Commons LicenseThis image is released under a CC BY-NC-SA 4.0 Licence

Buy this image as a print 

Buy

License this image for commercial use at Science and Society Picture Library

License

Creative Commons LicenseThis image is released under a CC BY-NC-SA 4.0 Licence

Buy this image as a print 

Buy

License this image for commercial use at Science and Society Picture Library

License

Creative Commons LicenseThis image is released under a CC BY-NC-SA 4.0 Licence

Buy this image as a print 

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License this image for commercial use at Science and Society Picture Library

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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

Brass sextant with polished frame and limb in keystone-shaped mahogany box, 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).

Details

Category:
Navigation
Object Number:
1974-619
Measurements:
Overall: 330 mm x 250 mm x 170 mm, 1.48 kg
type:
sextant
credit:
Meteorological Office

Parts

Brass framed sextant.

Brass framed sextant.

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).

Measurements:
Overall: 335 mm x 185 mm x 220 mm, 1.48 kg
Object Number:
1974-619/1
type:
sextant
Keystone-shaped mahogany for brass framed sextant.

Keystone-shaped mahogany for brass framed sextant.

Keystone-shaped mahogany box for brass sextant with polished frame and limb, by Jesse Ramsden, London, England, 1790-1800.

Measurements:
Overall: 335 mm x 185 mm x 220 mm, 1.48 kg
Materials:
brass (copper, zinc alloy) and mahogany (wood)
Object Number:
1974-619/2
type:
sextant