The ratio of the distances at which a stated length can be distinguished by the telescope and the human eye, respectively, is called ............

Contour lines ............

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

When the image formed by the objective is not situated in the plane of cross-hairs ............

If the radius of a simple curve is R, the length of the chord for calculating offsets by the method of chords produced, …

The lines passing through points at which the magnetic declination is equal at a given time are called ............

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

Plotting of inaccessible points on a plane table, is done by ............

Benchmark is established by ............