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The principal triangulation mesh over Great Britain, Ireland and the Isle of Man.
The principal triangulation mesh over Great Britain, Ireland and the Isle of Man.
The first Ramsden theodolite as used by Roy. (Destroyed by bomb damage in 1941.)
The first Ramsden theodolite as used by Roy. (Destroyed by bomb damage in 1941.)
The second Ramsden theodolite as purchased by the Board of Ordnance. Now in the Science Museum, London
The second Ramsden theodolite as purchased by the Board of Ordnance. Now in the Science Museum, London
South East end of the Baseline
South East end of the Baseline
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Triangulation of Kodiak Island in Alaska in 1929.
Triangulation of Kodiak Island in Alaska in 1929.
Liu Hui (c. 263), How to measure the height of a sea island. Illustration from an edition of 1726
Liu Hui (c. 263), How to measure the height of a sea island. Illustration from an edition of 1726