Explain the method of repetition to measure horizontal angle using transit theodolite.

Explain the method of repetition to measure horizontal angle using transit theodolite. 
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1 Answer

Answer :

Procedure:

1 Suppose the angle AOB is to be measured by the repetition process. The theodolite is set over O. The instrument is centered and levelled properly.Vernier A is set at 00 and vernier is at 1800

2.The lower plate is loosened.By turning the telescope the ranging rod at A is perfectly bisected with the help of lower clamp and tangent screw. Here the initial reading of vernier A is 00

3.The upper clamp is loosened and telescope is turned clockwise to perfectly bisect ranging rod at B by using upper clamp and tangent screw. Suppose the reading on vernier A is 300

4.The lower clamp is loosened and telescope turned to exactly bisect the ranging rod at A by lower plate clamp and tangent screw.Here the initial reading is 300 for second observation. 

5. The upper plate is loosened and the telescope is turned to exactly bisect the ranging rod at B by using upper clamp and tangent screw..Let the reading on vernier A is 600

6 The procedure is repeated for one more time.

7.The face of the instrument is changed and the previous procedure is followed.

8 The mean of the two angles obtained from two faces gives the actual angle AOB. 

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