Which of the following actions is not a permanent adjustment in case of transit theodolite ?
Axis of the telescope level adjusted to parallel to the line of collimation
Horizontal axis is perpendicular to vertical axis when the instrument is levelled
Axis of the plate level adjusted to perpendicular to vertical axis
Bringing the vertical axis of the theodolite exactly over the station mark
Bringing the vertical axis of the theodolite exactly over the station mark
Temporary adjustment :
• Temporary adjustments are the adjustments which are required to be made at each setting of
instrument before taking observations.
• Following five temporary adjustments are required
1. Setting up
2. Centering
3. Levelling
4. Focusing the eye-piece
5. Focusing the objective
Permanent adjustment :
1. Horizontal axis should be perpendicular to vertical axis.
Furthermore, vertical circle should also be perpendicular to horizontal axis.
2. The axis of plate bubble tube should be perpendicular to vertical axis.
3. The line of sight should be perpendicular to vertical axis.
4. When the telescope is horizontal and the altitude bubble is in center, the reading in vertical circle
should be zero.
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