Ramsden's three foot geodetic theodolite

Made:
1792 in England and London
maker:
Jesse Ramsden

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Theodolite by Ramsden, used on the Principle Triangulation of Great Britain and Ireland, 1792. With parts.

This theodolite is the oldest surviving of its size and was used on the Principal Triangulation of Great Britain and Ireland from 1792 to the early 19th century. It was used to measure both vertical and horizontal angles to a high degree of accuracy. This helped to produce the network of reference points underpinning the Ordnance Survey maps of the United Kingdom.

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Details

Category:
Surveying
Object Number:
1876-1203
type:
geodetic theodolite
taxonomy:
  • furnishing and equipment
  • measuring device - instrument
  • theodolite
credit:
Ordnance Survey
status:
Permanent collection

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