Surveying
In triangulation surveys

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

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Surveying
Normal tension is that pull which

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

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