Height of Instrument Method, Computing Reduced level.
The Height of Instrument Method (HI):
The reduced level of the line of collimation is said to be the height of the instrument (RL of HI).
The following are the different steps to be followed in this method:
1. Calculate Height of instrument by adding the backsight reading (BS) to the Rl of BM (First Point).
RL of HI = RL of BM + BS
2. Before Shifting the instrument, the RLs of Intermediate points and changing point (CP) are obtained by Subtracting the respective staff reading (IS or FS) from RL of HI.
RL of IS = RL of HI – IS
RL of CP = RL of HI - FS
3. Then level is shifted for the next set up and again the new height of the instrument is obtained by adding the back sight reading to the RL of CP (Which was obtained in first set up).
RL of HI = RL of CP + BS
4. The height of Instrument is different in different setups of the level.
5. For the Change point FS reading is taken before shifting the instrument and BS reading is taken on the same staff position after position after the instrument.
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