Two foot geodetic theodolite, 1826-1828

Made:
1826-1828 in London, England and Fleet Street
maker:
Troughton and Simms Limited
Two-foot geodetic theodolite with cast iron base and mahogany Two-foot geodetic theodolite with cast iron base and mahogany Two-foot geodetic theodolite with cast iron base and mahogany Two-foot geodetic theodolite with cast iron base and mahogany

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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

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

Two-foot geodetic theodolite with cast iron base and mahogany
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Two-foot geodetic theodolite with cast iron base and mahogany
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Two-foot geodetic theodolite with cast iron base and mahogany
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Two-foot geodetic theodolite with cast iron base and mahogany
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Two-foot geodetic theodolite with cast iron base and mahogany stand, by Troughton & Simms, London, England, 1826-28. Fitted with three bubble levels and eight reading microscopes. First used in 1828 for checking the Lough Foyle base. With separate parts.

This theodolite was made by Troughton and Simms and first used in 1828 for checking the Lough Foyle base, Northern Ireland. The theodolite was used for measuring both vertical and horizontal angles. This instrument was used for many years in conjunction with the Ramsden three foot geodetic theodolite in the preparation of the Primary Triangulation of Britain, the network of reference points underpinning Ordnance Survey maps.

Details

Category:
Surveying
Object Number:
1876-1204
Materials:
brass (copper, zinc alloy), iron, mahogany (wood), glass and platinum (metal)
Measurements:
Overall: 1730 mm x 965 mm x 900 mm, 128 kg
type:
geodetic theodolite
credit:
Ordnance Survey

Parts

Part of Two foot geodetic theodolite, British, 1826-1828

Part of Two foot geodetic theodolite, British, 1826-1828

Two-foot geodetic theodolite with cast iron base and mahogany stand, by Troughton and Simms, London, England, 1826-28. Fitted with three bubble levels and eight reading microscopes. First used in 1828 for checking the Lough Foyle base.

Measurements:
Overall: 1730 mm x 965 mm x 920 mm, 128 kg
Materials:
brass (copper, zinc alloy) , iron , mahogany (wood) , glass and platinum (metal)
Object Number:
1876-1204 Pt1
type:
instrument component and geodetic theodolite