Simple theodolite and case, 1771-1781

Made:
1771-1781 in London
maker:
James Search

Simple theodolite, with box, trade card and brass parts, by James Search of London, 1771-1781

Simple theodolites such as the circumferentor (with a full circle scale) and graphometer (with a half-circle scale) were widely used throughout the 17th and 18th centuries for angle measurement. A joint on the support allowed for both vertical and horizontal use. The tradecard on the box lid indicates that this circumferentor was made by James Search (active 1771-1781), a Mathematical, Philosophical and Optical Instrument maker who made and repaired instruments 'At the Globe in Crown Court, St Ann's Soho, London'.

Details

Category:
Surveying
Object Number:
1944-11
Materials:
box, oak, circumferentor, brass, circumferentor, glass, circumferentor, iron, needle, glass
type:
simple theodolite
taxonomy:
  • furnishing and equipment
  • measuring device - instrument
  • magnetic compass
  • furnishing and equipment
  • measuring device - instrument
credit:
Winn, G.W.

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