Computer · Levelling
In the Height of Collimation (Height of Instrument) method, how is the Reduced Level (R.L.) of any subsequent point obtained?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1By subtracting the Back Sight (B.S.) from the Height of Collimation
- 2By adding the Intermediate Sight (I.S.) to the Back Sight (B.S.)
- 3By subtracting the Fore Sight (F.S.) or Intermediate Sight (I.S.) from the Height of Collimation✓
- 4By adding the Fore Sight (F.S.) value to the previous R.L.
Correct answer
By subtracting the Fore Sight (F.S.) or Intermediate Sight (I.S.) from the Height of Collimation
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