While measuring horizontal angles by the method of repitition with a theodolite readings are taken on both the verniers. Which of the following errors will be eliminated by reading both the verniers?

- 1
  
  Error due to eccentrricity of the centres
- 2
  
  error due to imperfect adjustment of the line of collimation
- 3
  
  Error due to imperfect adjustment of the horizontal axis
- 4
  
  Error due to imperfect graduations

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