The position of point can be fixed more accurately by ............

A clinometer is used for ............

If vertical angles of inclined sights do not exceed 10° and non-verticality of the staff remain within 1° stadia system …

For preparation of contour plan for a route survey ............

The angle between two plane mirrors of optical square is ............

Ceylon Ghat tracer can read slopes up to ............

The smaller horizontal angle between the true meridian and a survey line, is known ............

In an adjusted level, when the bubble is central, the axis of the bubble tube becomes parallel to ............

The length of an engineer's chain is ............