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In the early 1920s a step change in theodolite design occurred with the introduction of the Wild T2 made by the Swiss Wild Heerbrugg company. Heinrich Wild designed a theodolite with divided glass circles with readings from both sides presented at a single eyepiece close to the telescope so the observer did not have to move to read them. The ...
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.
The permanent adjustments of theodolites are made to establish fixed relationship between the instrument's fundamental lines. The fundamental lines or axis of a transit theodolite include the following:- Vertical axis; Axis of plate levels; Axis of telescope; Line of collimation; Horizontal axis; Axis of altitude bubble and the vernier should ...
The firm's telescope-making business was acquired by Sir Howard Grubb, Parsons and Co. Ltd. [12] [13] [14] At the outbreak of war in 1939 the UK government placed large orders for military sighting telescopes and theodolites. By 1940 output was only limited by the supply of raw materials and orders exceeded £1,000,000.
The initial setting operation includes fixing the theodolite on a tripod, along with approximate levelling and centering over the station mark.For setting up the instrument, the tripod is placed over the station with its legs widely spread so that the centre of the tripod head lies above the station point and its head approximately level (by eye estimation).
The telescope was attached to one side of a square polar axis, near the upper end of the axis, balanced by a weight on the other side. A similar arrangement is used in some telescopes today. [23] His transit telescope used a hollow-cone design for its axis, a design adopted by later instrument makers such as Jesse Ramsden (1735–1800). [27]
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Allow transit measurements in any direction . Theodolite (Describing a theodolite as a transit may refer to the ability to turn the telescope a full rotation on the horizontal axis, which provides a convenient way to reverse the direction of view, or to sight the same object with the yoke in opposite directions, which causes some instrumental errors to cancel.
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