Surveying
The rise and fall method

provides a check on the reduction of intermediate point levels
quicker and less tedious for large number of intermediate sights
is less accurate than height of instrument method
is not suitable for levelling with tilting levels

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Surveying
In triangulation surveys

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

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

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

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