Surveying
Which of the following is not the function of levelling head ?

to support the main part of the instrument
None of these
to provide a means for leveling the theodolite
to attach the theodolite to the tripod

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Surveying
For mapping any country

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

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