Consider the following pre-conditions for correct use of a theodolite:
1. The vertical axis need not be perpendicular to the plane of the plate level bubble.
2. The line of sight must be perpendicular to the horizontal axis.
3. The axis of the level tube attached to the telescope need not be parallel to the line
of sight.
4. The vertical axis, the horizontal axis and the line of sight should all pass through
a point known as stadia centre.
Which of these conditions is/are necessary?
(a) 1, 2, 3 & 4 (b) 2 only (c) 3 only (d) 1 & 4 only
1. The vertical axis need not be perpendicular to the plane of the plate level bubble.
2. The line of sight must be perpendicular to the horizontal axis.
3. The axis of the level tube attached to the telescope need not be parallel to the line
of sight.
4. The vertical axis, the horizontal axis and the line of sight should all pass through
a point known as stadia centre.
Which of these conditions is/are necessary?
(a) 1, 2, 3 & 4 (b) 2 only (c) 3 only (d) 1 & 4 only