Components from the 3-foot geodetic theodolite

Made:
1791
maker:
Jesse Ramsden

Components from the three-foot geodetic theodolite, sometimes called the ‘great Theodolite’, used for the Principal Triangulation of Great Britain. Made by Jesse Ramsden, Piccadilly, London, 1791. Components consist of: 3 lamp microscope housings; 2 oil lamps with condensing lens; small oil lamp (without case); oil lamp brackets plus 2 lamp covers; clamp and sector clamp; telescope dust cap with apertures; 2 curved double bracket pieces; 1 single bracket piece; flange disc; 7 eyepieces; 1 filter; 1 right-angled eyepiece; dust cap; brush; 4 microscope illuminating mirrors and an assortment of bolts and fittings.

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Details

Category:
Surveying
Object Number:
1876-1203 Pt5
Materials:
brass (copper, zinc alloy), glass, iron, lead (metal), mahogany (wood), pine (wood) and tin plated
Measurements:
tray: 170 mm x 420 mm x 930 mm,
type:
instrument component
taxonomy:
  • furnishing and equipment
  • measuring device - instrument
  • theodolite
  • component - object
credit:
Ordnance Survey

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