Civil Engineering - Surveying - Discussion
Discussion Forum : Surveying - Section 2 (Q.No. 49)
49.
A dumpy level is set up with its eye-piece vertically over a peg A. The height from the top of peg A to the centre of the eye-piece is 1.540 m and the reading on peg B is 0.705 m. The level is then setup over B. The height of the eye-piece above peg B is 1.490 m and a reading on A is 2.195 m. The difference in level between A and B is
Discussion:
10 comments Page 1 of 1.
Vimo said:
5 years ago
Yes, here we can apply the reciprocal levelling formula. Agree @Darshan.
Bharat Chaudhary said:
6 years ago
Yes, right @Suresh @Kashyap.
(1)
Hilly kashyap said:
7 years ago
The true difference of level between A And B is;
e= [(1.540-0.705)+(2.195-1.490)]/2 =0.770.
e= [(1.540-0.705)+(2.195-1.490)]/2 =0.770.
(5)
Shruti said:
8 years ago
Please explain the answer with relevant formulas.
Pusp said:
8 years ago
Average is taken to eliminate an error. Because if there was no error then 0.835 m and 0.705 m would be equal.
Mahesh said:
9 years ago
Yes @Leon.
It is 0.705 m.
It is 0.705 m.
Bonnykumar said:
9 years ago
It is a theory of reciprocal levelling.
DARSHAN H A said:
9 years ago
Apply reciprocal leveling formula. Dividing 2 is done to eliminate error due to curvature and refraction.
Leon said:
9 years ago
Can you explain to me why did you divide by 2?
According to me it can either be 0.835 m or 0.705 m?
According to me it can either be 0.835 m or 0.705 m?
(1)
Suresh Awasthi said:
10 years ago
1. 1.540 m - 0.705 m = 0.835 m.
2. 2.195 m - 1.490 m = 0.705 m.
Now,
Difference in level between A and B = (0.835 + 0.705)/2.
= 0.770 m.
2. 2.195 m - 1.490 m = 0.705 m.
Now,
Difference in level between A and B = (0.835 + 0.705)/2.
= 0.770 m.
(2)
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