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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Surveying
The length of a chain is measured from

inside of one handle to inside of other handle
outside of one handle to inside of other handle
outside of one handle to outside of other handle
centre of one handle to centre of other handle

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