The length of a link of Gunter's chain is ............

The vertical distance between any two consecutive contours is called ............

The systematic errors which persist and have regular effects in the performance of a survey operations, are due to .....…

Diaphragm of a surveying telescope is held inside ............

In chain surveying field work is limited to ............

In horizontal angles, the error due to imperfect leveling of the plate bubble is ............

The collimation method for obtaining the reduced levels of points does not provide a check on ............

The two point problem and three point problem are methods of ............

Contour interval, within the limits of a map ............