Discussion
The rod (level staff) reading taken on a point of known elevation called?
Answer: B
A staff reading taken on a point of known elevation is a back sight.
A back sight (BS) is the first reading taken after setting up the level, on a bench mark or a point whose reduced level is already known. Adding it to that RL gives the height of instrument: HI = RL + BS.
A fore sight is the last reading before moving the instrument, taken on a point whose level is to be found. 'Plane of sight' (line of collimation) is the horizontal line through the instrument, not a reading.
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