Question
Download Solution PDFWhat instrument is primarily used for setting out a right-angle layout on site?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
Instrument used for setting out right angles:
- Cross staff.
- Open
- French
- Adjustable
- Optical square
- Prism square
- Auto level
Cross staff:
- The cross staff or open cross staff is a simple instrument used for setting out offsets to chain line from a given point.
- It is also ued setting out right angle at given point of chain line.
- The accuracy of french cross staff is less than the open cross staff.
- The french cross staff has the advantages that the line can also be set out at angle of 45∘, 90∘ and 135∘.
Optical square:
- Based on double reflection.
- Small pocket instrument, slightly larger than watch.
- It is used for setting out right angles.
- More convenient and more accurate than a cross staff.
Prism square:
- It is based on optical principle.
- It have two reflecting surfaces H and I fixed at 45∘.
- It also used for setting out right angles.
Last updated on Jul 2, 2025
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