Draw sketch and write the procedure for setting offset to the left or right side of suvey line with open cross-staff.

Draw sketch and write the procedure for setting offset to the left or right side of suvey line with open cross-staff.
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1 Answer

Answer :

Procedure for setting offset with open cross staff :

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1. Keep the ranging rods at point P(fixed on survey line) and at point

A1 approximately.

2. The cross staff with stadia rod is fixed at point B.

3. Now two surveyors will observe both rods at A1 and P simultaneously.

4. If both rods are not bisecting at a time, then rod at A1 should move towards right parallel to survey line (towards left if rod is at A2) as shown in above fig.

5. Once both rods are bisected simultaneously then point A can be fixed and perpendicular offset AB is said to be set to given survey line PQ in left side.

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