Altazimuth theodolite, British, 1725-1747

Made:
1725-1747 in Strand, London and England
maker:
Jonathan Sisson

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

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

Altazimuth theodolite, 4 1/2-inch, by Jonathan Sisson, Styrand, London, England, 1725-1747

Theodolites, such as this example made by J Sisson, are instruments for measuring angles both in the horizontal and the vertical and have been widely used in surveying since the 16th century. Sisson in 1720 introduced the telescope and cross-hairs. This later example includes bubble levels and a better method of setting the vernier.

Details

Category:
Surveying
Object Number:
1921-588
type:
theodolite
taxonomy:
  • furnishing and equipment
  • measuring device - instrument
credit:
Court, Thomas Henry

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