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The instrument used for setting out an offset at right angle, is called as:
- a)open cross-staff
- b)French-cross staff
- c)adjustable cross-staff
- d)optical square
Correct answer is option 'A'. Can you explain this answer?
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Verified Answer
The instrument used for setting out an offset at right angle, is calle...
1. Open cross staff is used to setting out an offset at right angle.
2. French cross staff is used for setting out an offset at angle of 45 degree.
3. Optical square is used for setting out accurately the long offsets.
4. adjustable cross staff is used for setting out an offset at any angle.
2. French cross staff is used for setting out an offset at angle of 45 degree.
3. Optical square is used for setting out accurately the long offsets.
4. adjustable cross staff is used for setting out an offset at any angle.
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The instrument used for setting out an offset at right angle, is calle...
Instrument for Setting Out an Offset at Right Angle
The instrument used for setting out an offset at right angle is called an open cross-staff.
What is an Open Cross-Staff?
An open cross-staff is a simple and ancient surveying instrument used to measure angles and distances. It is composed of two graduated arms pivoted at one end and attached with a crosspiece at the other end. It is used to set out offsets at right angles.
How is an Open Cross-Staff used?
To use an open cross-staff to set out an offset at right angles, follow these steps:
1. Place the staff at the point where the offset is to be taken.
2. Hold the cross-staff horizontally and move it until one arm points to the staff and the other points to the point where the offset is to be taken.
3. Take a reading of the angle between the two arms of the cross-staff.
4. Move the cross-staff to the point where the offset is to be taken and set it up in the same way as before.
5. Take a reading of the angle between the two arms of the cross-staff again.
6. The difference between the two angles gives the angle of the offset.
7. Measure the distance from the staff to the point where the offset is to be taken.
8. Set out the offset at right angles to the original line.
Conclusion
Using an open cross-staff to set out an offset at right angles is a simple and effective method of surveying. It is still used today, even with the availability of more modern instruments, due to its simplicity and accuracy.
The instrument used for setting out an offset at right angle is called an open cross-staff.
What is an Open Cross-Staff?
An open cross-staff is a simple and ancient surveying instrument used to measure angles and distances. It is composed of two graduated arms pivoted at one end and attached with a crosspiece at the other end. It is used to set out offsets at right angles.
How is an Open Cross-Staff used?
To use an open cross-staff to set out an offset at right angles, follow these steps:
1. Place the staff at the point where the offset is to be taken.
2. Hold the cross-staff horizontally and move it until one arm points to the staff and the other points to the point where the offset is to be taken.
3. Take a reading of the angle between the two arms of the cross-staff.
4. Move the cross-staff to the point where the offset is to be taken and set it up in the same way as before.
5. Take a reading of the angle between the two arms of the cross-staff again.
6. The difference between the two angles gives the angle of the offset.
7. Measure the distance from the staff to the point where the offset is to be taken.
8. Set out the offset at right angles to the original line.
Conclusion
Using an open cross-staff to set out an offset at right angles is a simple and effective method of surveying. It is still used today, even with the availability of more modern instruments, due to its simplicity and accuracy.
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The instrument used for setting out an offset at right angle, is called as:a)open cross-staffb)French-cross staffc)adjustable cross-staffd)optical squareCorrect answer is option 'A'. Can you explain this answer?
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