Correction for Erroneous Length of Chain/Tape:

The chain surveying depend just on linear measurement of distances. For traversing only the errors within distance measurements are of significance and importance. Measuring devises either chain or tape could either be longer or shorter than the designated length. The measured distance would be smaller than the actual if the length of chain is longer than the designated length.  It will be larger than an actual if the chain is shorter than the designated length. The actual measured distance could be corrected through the following formula:

True or Correct Distance = L′/L × Measured Distance

where,            L′ = Actual incorrect length of chain, and

L = Designated length of chain.