An invar tape is made of an alloy of ............

The cross staff is carried out for ............

Detailed plotting is generally done by ............

The tacheometric method of contouring is particularly suitable ............

The vertical angle between longitudinal axis of a freely suspended magnetic needle and a horizontal line at its pivot, i…

The length of chain is measured from ............

A negative declination shows that the magnetic meridian is to the ............

The difference between the most probable value and its observed value is ............

Short offsets are measured with ............