Civil Engineering Jobs

Resection Method.

This method is used for establishing the instrument stations or after completing the traverse surveying the important object cannot be located due to difficulties & missed the station. PROCESS:-

1. Select the two stations P & Q on the ground & measure the length PQ & plot to a scale pq on a suitable scale.
2. Set the table at P , Centre, & level the table so that the point p is over the P.
3. Place the alidade along pq, orient the table by turning the board until the signal at Q is bisected, & then clamp it.
4. With the alidade touching at p sight the station R & draw a ray p to r.
5. Shift the table at R. & make the center & level & sight the point P by back sighting & clamp the table.
6. With the alidade centered on q, sight the station Q & draw a ray. The point of intersection of this ray & that previously drawn from p gives the reqd point r.