Surveying
Size of a theodolite is specified by

the diameter of lower plate
the diameter of vertical circle
the length of telescope
the diameter of upper plate

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Surveying
For mapping any country

All listed here
Geodetic triangulation of greatest possible sides and accuracy is carried out
Secondary triangles are further broken into third and fourth order triangles, the points of which are used for detail surveys
Primary triangles are broken down into secondary triangles of somewhat lesser accuracy

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