Differentiate between plane of collimation and rise and fall method.

Differentiate between plane of collimation and rise and fall method.
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1 Answer

Answer :

S.N
Rise and fall method
Plane of collimation
1 It is slow and more tedious.
It is more rapid and less tedious 
2 It is laborious as it involves more calculations.
It is simple as it involves less calculation.
3 In this method there is complete check on all calculation work.
In this method there is no check on calculations of R.L. of intermediate sight and mistakes made remain unchecked.
4 In this method the mistake made in calculating the R.L. of any point will be carried forward.
In this method the error in calculating the R,L, of I.S. is not carried forward as the R,L, are calculated from the respective plane of collimation.
5 It is used in precise levelling work, check levelling calculations.
It is usually used in profile levelling calculation.
6 Arithmetical check ΣB.S.-ΣF.S=ΣRise–Σfall =Last RL-First RL
Arithmetical check ΣB.S.- ΣF.S=Last RL-First RL
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The line of collimation method of reduction of levels, does not provide a check on (A) Intermediate sights (B) Fore sights (C) Back sights (D) Reduced levels

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Description : As used in survey

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