Deflection Angle with Theodolite.
Theory
The term of deflection angle is used to mean the angle made by the survey line to the extension of the presiding line.
For Instrument required.
1. Theodolite
2. Ranging rods
Diagram.
Procedure.
1. The instrument was setup & level accurately at the station ‘O’
2. Both the plates wear clamped at the ‘O’ level & back sight was taken on the station point.
3. The upper plot was in the clamped & the fore sight of the station ‘O’ was taken. The reading on both verniers were recorded.
4. The lower clamp was unclamped & the instrument was shifted to the station ‘P’ again. There was no change in the reading as recorded in step 3 above.
5. The process was repeated & the instruments was again sighted to ‘Q’. The readings on the both verniers are recorded.
6. As the deflection angle was doubled because of the taking both face reading. The average value of the deflection angle was obtained by dividing the final reading by 2.
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