In the Height of Instrument (H.I.) method of leveling, the H.I. is computed as:
Choose the correct answer
Elevation of instrument - backsight reading
Elevation of B.M. + backsight reading
Foresight reading - B.M. elevation
Height of tripod from ground
Correct Answer
B. Elevation of B.M. + backsight reading
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H.I. (Height of Instrument) = Elevation of station + BS reading (line of sight elevation). Then: R.L. of any intermediate/foresight station = H.I. - IS or FS reading. H.I. changes at each instrument setup (change point). Check: sum of BS - sum of FS = last R.L. - first R.L.
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