Study the given table and answer the question that follows.
|
Line |
FB |
BB |
|
AB |
76° 30' |
259° 10' |
|
BC |
110° 00', |
289° 30' |
|
CD |
227° 00' |
47° 00' |
|
DA |
309° 00' |
130° 00' |
The fore bearings and back bearings for a closed traverse ABCD are given above. Among the stations A, B, C and D, find the stations affected with local attraction and what will be the corrected FB of the line AB.
1
Local attraction: C and D; FB of AB: 75° 30’
2
Local attraction: A and B; FB of AB: 75° 30’
3
Local attraction: A and B; FB of AB: 77° 30’
4
Local attraction: C and D; FB of AB: 77° 30’