For a Theodolite instrument certain Permanent adjustments are done from time to time to avoid any kind of erroneous observations. Which of the following statements is INCORRECT with respect to these adjustments?
1
The axis of the plate level must be perpendicular to the vertical axis
2
The line of collimation must be at right angles to the horizontal axis
3
The axis of telescope level must be parallel to the line of collimation
4
The Horizontal axis must be parallel to the vertical axis