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Theodolite used for the Principal Triangulation of Great Britain

Theodolite used for the Principal Triangulation of Great Britain

1791
Two foot geodetic theodolite, British, 1826-1828

Two foot geodetic theodolite, British, 1826-1828

1826-1828
Two foot geodetic theodolite, 1826-1828

Two foot geodetic theodolite, 1826-1828

1826-1828
Geodetic theodolite, German, 1820-1850

Geodetic theodolite, German, 1820-1850

1820-1850
Everest pattern geodetic theodolite

Everest pattern geodetic theodolite

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.

Components from the 3-foot geodetic theodolite

1791
2 levels. Part of 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.

2 levels from the 3-foot geodetic theodolite

1791
This Geodetic Theodolite made by Carl Bamberg, was used for high-accuracy surveying tasks, particularly in geodesy. It dates c1900-49 and was part of the equipment held by the Ministry of Supply (Directorate of Weapons Research). This object is 1/2.

Geodetic theodolite - case one of two

2 eyepices and a cannister with caps and screws for Two-foot geodetic theodolite by Troughton & Simms, London, England, 1826-28

Accessories for Two foot geodetic theodolite, 1826-1828

1826-1828
This Geodetic Theodolite made by Carl Bamberg, was used for high-accuracy surveying tasks, particularly in geodesy. It dates c1900-49 and was part of the equipment held by the Ministry of Supply (Directorate of Weapons Research). There is incribed on the front of the object the initials "C.B" and suspected serial number of 10000. There is further text on the object, "Mäßig anziehen", which translates to "Tighten Moderately". This object is 2/2.

Geodetic theodolite - Case two of two