Surveying
If the focal length of the object glass is 25 cm and the distance from object glass to the trunnion axis is 15 cm, the additive constant is

0.1
0.6
1.33
0.4

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Surveying
Normal tension is that pull which

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

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