Mistakes in reading or laying of direction of a line using Theodolite

  • Reading the wrong vernier scale
  • Misreading the vernier

    There are two sets of vernier scales marked on a single vernier. While taking reading, use that set of figures which increase in the same direction as the figure in the main direction.

  • Reading the vernier in the wrong direction.
  • Turning the wrong tangent screws
  • Failing to tighten the clamp screw.
  • Reading the numbers on the horizontal scale from the wrong row.
  • Reading angles in the wrong direction.
  • Sighting on the wrong signals or setting up over the wrong station
  • Booking the wrong values
  • Missing the wrong right or left in deflection angle
  • Using haphazard field procedure.

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