Diurnal variation of magnetic declination is ............

The horizontal angle between the truth meridian and magnetic meridian is known as ............

In tacheometrical observations, vertical staff holding is generally preferred to normal staffing, due to ............

When internal angles are to be subtended by a theodolite survey for closed traverse ............

Under ordinary conditions, the precision of a theodolite traverse is affected by ............

The longitudinal section of the surface of bubble tube is ............

In a tacheometer provided with anallactic lens distance between object glass and vertical axis is 15 cm. Focal length of…

The approximate formula for radial or perpendicular offsets from the tangent, is ............

An angle between the inclined line of sight and the horizontal is called ............