Surveying
Normal tension is that pull which

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

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Surveying
Transit rule of adjusting the consecutive coordinates of a traverse is used where

angular measurements are more accurate than linear measurements
linear and angular measurements of the traverse are of equal accuracy
All of these
linear measurements are more accurate than angular measurements

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