Surveying
Normal tension is that pull which

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

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Surveying
The First Point of Aeries

Is located near the very conspicuous rectangle of stars in the constellations of Pegasus and Andromeda
All listed here
Is the point in the celestial sphere where zero meridian crosses the celestial equator
Is usually denoted by the Greek letter ?

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Surveying
In triangulation surveys

All listed here
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

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