Errors in Compass Surveying

Errors in Compass Survey:

They are classified as

  1. Instrumental errors
  2. Personal errors
  3. Errors due to natural causes.

a) Instrumental errors:

They are those which arise due to the faulty adjustment of the instruments. The may be due to the following reasons:

  1. The needle not being perfectly straight.
  2. Pivot being bent.
  3. Sluggish needle.
  4. Blunt pivot point.
  5. Improper balancing weight.
  6. Plane of sight not being vertical.
  7. Line of sight not passing through the centres of the right.

b) Personal Errors:

They may be due to the following reasons:

  1. Inaccurate levelling of the compass box
  2. Inaccurate centring.
  3. Inaccurate bisection of signals
  4. Carelessness in reading and recording.

c) Natural Errors:

They may be due to the following reasons:

  1. Variation in declination.
  2. Local attraction due to proximity of local attraction forces.
  3. Magnetic changes in the atmosphere due to clouds and storms.
  4. Irregular variations due to magnetic storms etc.
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