Q309
Which levelling instrument have the high presion, the mean elevation error on invar staff graduated to 5mm division varies between +0.5 - 0.8 per km of forward and back ward levelling.
A.
Self aligning level
AnswerB.
Wye level
C.
Tilting level
D.
Dumpy level
Answer: Option A
Solution
Answer: Option A
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