Reciprocal levelling was carried with the help of a dumpy level and the following observations were recorded:
|
Instrument near Station |
Staff Reading at station |
|
|
A |
B |
|
|
A |
1.25 |
1.40 |
|
B |
0.8 |
0.6 |
Considering the R.L of station A as 620.5 and neglecting refraction and curvature error, which of the following statements is/are correct?
1
Collimation error (e) = 0.175
2
R.L of B = 620.525
3
Collimation error (e) = 0.025
4
R.L of A = 619.975