The use of the spirit level fixed to the telescope of a levelling instrument is:
ATo make the line of sight vertical
BTo make the line of sigh thorizontal
CTo compute the difference in elevations
DTo establish the G.T.S.Bench mark method
ATo make the line of sight vertical
BTo make the line of sigh thorizontal
CTo compute the difference in elevations
DTo establish the G.T.S.Bench mark method
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