Surveying
In triangulation surveys

All listed here
The area is divided into triangular figures
Control stations are located from which detailed surveys are carried out
Sides are not measured excepting the base line

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Surveying
Normal tension is that pull which

is used at the time of standardising the tape
makes the correction due to pull equal to zero
neutralizes the effect due to pull and sag
makes the correction due to sag equal to zero

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