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A direct-readout theodolite, manufactured in the Soviet Union in 1958 and used for topographic surveying. A theodolite (/ θ i ˈ ɒ d ə ˌ l aɪ t /) [1] is a precision optical instrument for measuring angles between designated visible points in the horizontal and vertical planes.
A total of eight such instruments were manufactured by Ramsden and others for use in Britain, India and Switzerland. [1] [2] Ramsden himself constructed three theodolites and a further two were completed to his design by Mathew Berge, his son-in-law and business successor, after Ramsden's death in 1805.
A surveyor using a total station A student using a theodolite in field. Surveying or land surveying is the technique, profession, art, and science of determining the terrestrial two-dimensional or three-dimensional positions of points and the distances and angles between them.
This is to prevent people from disrupting the total station as they walk past, which would necessitate resetting the tripod and re-establishing a baseline. Additionally, an assistant surveyor discourages opportunistic theft, which is not uncommon due to the value of the instrument. If all else fails, most total stations have serial numbers.
Gyro-theodolites are not normally used within about 15 degrees of the pole where the angle between the earth's rotation and the direction of gravity is too small for it to work reliably. Unlike an artificial horizon or inertial navigation system, a gyro-theodolite cannot be relocated while it is operating. It must be restarted again at each site.
Troughton & Simms was a British scientific instrument firm. It was formed when Edward Troughton in his old age took on William Simms as a partner in 1826. It became a limited company in 1915 [1] and in 1922 it merged with T. Cooke & Sons to form Cooke, Troughton & Simms.
The first Ramsden theodolite as used by Roy. (Destroyed by bomb damage in 1941.) In the aftermath of the Jacobite rising of 1745, the Duke of Cumberland (military commander against the rebels) – advised by Lieutenant-Colonel David Watson, a Deputy Quartermaster-General of the Board of Ordnance – recognised that there was a need for an accurate map of the Scottish Highlands.
John Grundy, Sr. (c. 1696–1748), land surveyor and civil engineer, obtained a precision level with telescopic sights from Sisson before 1734. The instrument was accurate to less than 1 inch (25 mm) in 1 mile (1.6 km). [14] Sisson initially built theodolites with plain sights, then made the key innovation of introducing a telescopic sight.
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