When the latitudes and departures are so adjusted that the algebraic sum of the latitudes and departures are equal to zero, the operation is called ............

A line joining the apex of a triangle to some fixed point on the opposite side is called a ............

The brightness of the image ............ the magnifying power.

Refraction correction ............

The adjustment of horizontal cross hair is required particularly when the instrument is used for ............

Which of the following angles can be set out with the help of French cross staff?

The tangent to the liquid surface in a level tube, is parallel to the axis of the bubble ............

Different grades are joined together by ............

Substense bar is an instrument used for ............