Surveying
The want of correspondence in stereo-photographs

Is a good property
Is minimum when θ is 3°
Is not affected by the change of flying height between photographs
Is a function of tilt

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Surveying
Normal tension is that pull which

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

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