Surveying
In triangulation surveys

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

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Surveying
Which of the following errors can be eliminated by taking mean of bot face observations ?

error due to eccentricity of verniers
error due to imperfect adjustment of plate levels
error due to line of collimation not being perpendicular to horizontal axis
error due to imperfect graduations

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