Surveying
Check lines (or proof lines) in Chain Surveying, are essentially required

To increase the out-turn
To plot the offsets
To indicate the accuracy of the survey work
To plot the chain lines

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Surveying
Normal tension is that pull which

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

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