In a closed traverse the algebraic sum of deflection angle is ............

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

The true or geographical meridians through the various stations ............

A negative declination shows that the magnetic meridian is to the ............

Rankine's deflection angle in minutes is obtained by multiplying the length of the chord by ............

The plotting of small areas which can be commanded from a single station, is usually done on the plane table by the meth…

In an internal focusing type of telescope, the lens provided is ............

The representative fraction 1/2500 means that the scale is ............

Systematic errors are those errors ............