Correct Answer - Option 2 : Angular measurement
Concept:
Theodolite:
Tyes of theodolite:
1. Transit theodolite:
A theodolite is called a transit theodolite when its telescope can be transited i.e revolved through a complete revolution about its horizontal axis in the vertical plane.
2. Non-transit theodolite:
A theodolite is called a transit theodolite when its telescope cannot be transited. They are inferior in utility and have now become obsolete.
Uses of theodolite:
- Measuring horizontal and vertical angles.
- Locating points on a line
- Prolonging survey lines
- Finding difference of level
- Setting out grades
- Ranging curves
- Tacheometric Survey