The correction applied to the measured base of length L is

- 1
  
  tension = $\frac{(P - P_{s}) L}{A E}$
- 2
  
  sag = $\frac{L^{3} w^{2}}{24 P^{2}}$ where w is the weight of tape/m
- 3
  
  reduction to mean sea level = $\frac{L h}{R}$
- 4
  
  all the above

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