search
arrow-left Previous
Next arrow-right
Q: Which of the following instruments can be used for oblique offsets, at angles other than 45 degrees?
  • A. Cross–staff
  • B. Optical square
  • C. Adjustable cross–staff
  • D. French cross–staff
Correct Answer: Option C - Adjustable Cross Staff- The adjustable cross staff consists of two cylinders of equal diameter placed on the top of the other both are provided with sighting slits. • It is possible to set out any angle with the help of this instrument. • An adjustable cross staff is sometimes fitted with the magnetic compass on its top space which may be use to determined the magnetic bearing of a line.
C. Adjustable Cross Staff- The adjustable cross staff consists of two cylinders of equal diameter placed on the top of the other both are provided with sighting slits. • It is possible to set out any angle with the help of this instrument. • An adjustable cross staff is sometimes fitted with the magnetic compass on its top space which may be use to determined the magnetic bearing of a line.

Explanations:

Adjustable Cross Staff- The adjustable cross staff consists of two cylinders of equal diameter placed on the top of the other both are provided with sighting slits. • It is possible to set out any angle with the help of this instrument. • An adjustable cross staff is sometimes fitted with the magnetic compass on its top space which may be use to determined the magnetic bearing of a line.