The lines of earth's magnetic field run from ............

The best method of interpolation of contours, is by ............

In a quadrantal system, the bearing of a line is measured ............

If the whole circle bearing of a line is 270° its reduced bearing is ............

When the first object is to be focused, the scale is set to 0°00'00" and then ............

The distance between terminal points computed from known, as ............

Ramsden eye-piece consists of ............

The magnetic bearing of a lines is 55°30' and the magnetic declination is 4°30' west. The true bearing of a line will be…

Anallatic lens is provided to ............