In a theodolite the line of collimation is

According to Bowditch Rule, the correction to latitude (or departure) of any side is equal to

The method of levelling in which the heights of mountains are found by observing the temperature at which water boils is…

The method of finding out the difference in elevation between two points for eliminating the effect of curvature and ref…

The combined correction due to refraction and earth's curvature is

Sensitiveness of bubble tube can be increased by

The amount of correction due to local attraction at a place

A relatively permanent point of reference whose elevation is known as:

For which of the following permanent adjustments of theodolite, the spire test is used?