Circumferentor, 1750-1763.

Made:
1750-1763 in London
maker:
George Adams

Circumferentor by G. Adams of London, used in 1763 on the survey of the Mason-Dixon line, 1725-1763

This circumferentor was made by George Adams of London, one of the top instrument makers of the day. It was used between 1750-1763 on the survey of the Mason-Dixon line, in America. The instrument is inscribed in an engraved circle; 'Geo: Adams LONDON'. Circumferentors (with a full circle scale) and graphometers (with a half circle scale) were widely used for angle measurement in the 17th and 18th centuries. A joint on the support allowed for both vertical and horizontal use.

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Science Museum: Making the Modern World Gallery

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Details

Category:
Surveying
Object Number:
1977-755
Materials:
brass, silver, scale in compass and steel, blued, needle
type:
circumferentor
taxonomy:
  • furnishing and equipment
  • measuring device - instrument
  • magnetic compass
credit:
Royal Geographical Society

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