Question
Download Solution PDFWhich of the following staff readings is/are taken at a turning point, that necesiates instruments change point in levelling work?
A) Fore sight
B) Back sight
C) Intermediate sight
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
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Fore sight (FS): This is the last staff reading taken before the instrument is moved to a new position. It is read on the turning point and is used to calculate the reduced level (RL) of the turning point. The fore sight reading indicates that the current position of the leveling instrument will be changed.
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Back sight (BS): This is the first staff reading taken after the instrument is set up at a new position. It is read on the same turning point that was used for the fore sight reading, ensuring continuity in the level line. The back sight reading is essential for establishing a new line of sight from the new instrument position.
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Intermediate sight (IS): Intermediate sights are taken between the back sight and the fore sight, on various points of interest along the line of leveling. These do not require an instrument change and are not taken at turning points.
Conclusion: Both fore sight (FS) and back sight (BS) readings are taken at turning points in leveling work, necessitating a change in the instrument's position.
Last updated on May 28, 2025
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