A fixed reference point of known elevation
AChange point
BDatum
CBench mark
DForesight
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Related Questions:
The theodolite is an instrument used for measuring very accurately :
The rise and fall method provides complete check on
In a transit theodolite, when the line of collimation is horizontal the vertical circle vernier must read :
The collimation method for obtaining the reduced levels of points does not provide a check on
An imaginary line lying throughout the surface of the ground and preserving an constant inclination to the horizontal is known as :