Civil Engineering MCQAE Level Civil Engineering
The fundamental condition for a theodolite is that the line of collimation should be:
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Choose the correct answer
A
perpendicular to horizontal axis
B
parallel to vertical axis
C
parallel to plate bubble
D
tangent to magnetic meridian
Correct Answer
A. perpendicular to horizontal axis
Why is this the answer?
The line of collimation must be perpendicular to the horizontal/trunnion axis for correct transit observations.
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