The index glass in an optical square is ............

While measuring a chain line between two stations A and B intervened by a raised ground ............

An instrument used for ranging is ............

Straight, parallel and widely spaced contours represent ............

For the Abney clinometer the semi-circular arc is graduated as ............

Locating the position of plane table station with reference to three known points, is known as ............

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

For a transit theodolite the least reading on the main scale is 20'. If its vernier scale should read 20", then ........…

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