For which of the following permanent adjustment of a theodolite is the spire test used?
1
Adjustment of plate levels
2
Adjustment of line of sight
3
Adjustment of horizontal axis
4
Adjustment of altitude bubble and vertical index frame
For which of the following permanent adjustment of a theodolite is the spire test used?
Adjustment of plate levels
Adjustment of line of sight
Adjustment of horizontal axis
Adjustment of altitude bubble and vertical index frame