Question

Cross - staff is used for

• A. Measuring horizontal angle
• B. None of these
• C. setting out right angle
• D. Both (a) and (b)

Answer 1

The correct option is C setting out right angle

Cross staff is used for setting out a right angle at a given point on the chain line.


The accuracy of french cross staff is less than that of an open cross staff. However the french cross - staff has the advantage that the lines can also be set out at angles of ${45}^0$ and ${135}^0$. In that respect, a french staff is superior to an open cross staff.