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Question
Which of the following corrections is relevant with regards to trigonometric levelling?
A.
Correction for dip
B.
Correction for axis signal
C.
Correction for curvature
D.
Correction for parallax
Answer ( Option B)

Correction for axis signal

Solution

Axis signal correction:
• In order to observe the points from the theodolite station, signals of appropriate heights are erected at the points to be observed. The signal may or may not be same height as that of the instrument. 
• If height of the signal is not same as that of the height of instrument axis above the station, a correction known as the axis signal correction or eye and object correction is applied.

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