Question: On a backsight in differential leveling, the recorded rod reading ( with an extended rod ) is 1 2 . 4 7 ft . If

On a backsight in differential leveling, the recorded rod reading (with an extended rod) is
12.47 ft. If the rod is leaning 3\deg 30 from plumb, what is the resulting error in the recorded
height of the instrument (H.I.)?(Please specify the algebraic sign: + or -).1 pt

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