A fixed reference point of known elevation
AChange point
BDatum
CBench mark
DForesight
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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
In a transit theodolite, when the line of collimation is horizontal the vertical circle vernier must read :
The line joining points of equal elevation is known as
Method used for chaining on slopping ground
A fixed point with known elevation is known as