If vertical angles of inclined sights do not exceed 10° and non-verticality of the staff remain within 1° stadia system of techeometric observations are made on ............

The capacity of a telescope of producing a sharp image is called its ............

Stadia tacheometry was discovered by James Watt in the year ............

The value of additive constant for the tacheometer varies from ............

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

The projection of a traverse line on a line perpendicular to the meridian is known as ............

The instrument used for setting out an offset at a right angle, is called ............

A pass or a saddle in a mountainous region ............

Intersection is preferred to radiation when ............