# 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*isDiscussion:

10 comments Page 1 of 1.
Vimo said:
4 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:
6 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.

(4)

Shruti said:
7 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:
8 years ago

Yes @Leon.

It is 0.705 m.

It is 0.705 m.

Bonnykumar said:
8 years ago

It is a theory of reciprocal levelling.

DARSHAN H A said:
8 years ago

Apply reciprocal leveling formula. Dividing 2 is done to eliminate error due to curvature and refraction.

Leon said:
8 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?

Suresh Awasthi said:
9 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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