Surveying
The adjustment of horizontal cross hair is required particularly when the instrument is used for

measurement of horizontal angles
leveling
All of these
prolonging a straight line

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Surveying
In triangulation surveys

The area is divided into triangular figures
Control stations are located from which detailed surveys are carried out
Sides are not measured excepting the base line
All listed here

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Surveying
Accidental errors

Do not follow any definite mathematical law
Cannot be removed by applying corrections to the observed values
Are generally small
All of these

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