Case for simple theodolite, English, 1771-1781
- Materials:
- brass (copper, zinc alloy) , paper (fibre product) , oak (wood) , felt and iron
- Object Number:
- 1944-11 Pt1
- type:
- instrument case
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:
- oak (wood), brass (copper, zinc alloy), iron, glass and complete
- Measurements:
-
box: 114 mm x 383 mm x 383 mm,
socket: 145 mm,
- type:
- simple theodolite
- credit:
- Winn, G.W.
Parts
Simple theodolite, English, 1771-1781
- Object Number:
- 1944-11 Pt2
- type:
- instrument component and simple theodolite
