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 and 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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