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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 consist 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 consist 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 consist 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.