A plumb line is ............

Removal of parallax, may be achieved by focusing ............

The operation of revolving a plane table about its vertical axis so that all lines on the sheet become parallel to corre…

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

The angle of intersection of a counter and a ridge line, is ............

Line of collimation ............

The true or geographical meridians through the various stations ............

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

For a closed traverse the omitted measurements may be calculated ............