Explain with neat sketch graphical adjustment of closing error.
Procedure:
1. Plot the traverse e.g. A’BCDEA to suitable scale and obtain magnitude and direction of closing error.
2. Draw a straight line A’BCDEA to some suitable scale representing the total length of traverse lines.
3. Mark on this straight line, closing error AA’ as Aa’ but to scale of traverse.
4. Join A’ with a’ as shown in fig.
5. Draw lines parallel to Aa’ through points B,C,D and E giving points b’ c’ d’ and e’.
6. Bb’, Cc’, Dd’ and Ee’ directly gives correction at stations B,C,D and E respectively.
7. Mark the corrections in same direction of AA’ at plotted points and locate new position of station points to give correct traverse A’B’C’D’E’A’.