Discussion
The (level staff) rod reading taken on a point, the elevation of which is to be determined is called?
Answer: C
A staff reading on a point whose elevation is to be determined is a fore sight.
The fore sight (FS) is the last staff reading taken from a setting of the level, on a point whose reduced level is unknown, often a change point or the end of the line. Its RL is the height of instrument minus the fore sight: RL = HI − FS.
A back sight is taken on a point of known level. A back bearing belongs to compass traversing and is a direction, not a staff reading. A bench mark is a point of known level, not a reading.
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