engineering recuitment UKPSC AE Civil 2021 Mock Test (Re-Exam) Surveying Compass Surveying and Theodolite
While taking a backsight reading in Vernier theodolites, the screw used is
1
Lower clamp
2
Upper clamp
3
Upper tangent
4
None of above
While taking a backsight reading in Vernier theodolites, the screw used is