Civil Engineering MCQAE Level Civil Engineering
The correction for curvature in levelling is
SurveyingGeneralMEDIUM
Choose the correct answer
A
always zero
B
positive to staff reading
C
equal to refraction correction exactly
D
negative to staff reading
Correct Answer
D. negative to staff reading
Why is this the answer?
Curvature makes the line of sight above the level surface, so correction to reading is negative.
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