The process of turning the telescope about the vertical axis in horizontal plane is called
Atransiting
Breversing
Cplunging
Dswinging
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Following staff readings were taken with a level, the instrument having been moved after third and sixth reading 2.200, 1.620, 0.980, 2.250, 2.840, 1.280, 0.600, 1.960, 1.450 If R.L. of first point is 100.000 m, then RL of last point is