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Spire test in used is permanent adjustment of theodolite for:-
1. adjusting the plate levels
2. adjusting the line of sight
3. adjusting the vertical axis
4. adjustment of horizontal axis

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Correct Answer - Option 4 : adjustment of horizontal axis

Concepts:

The following test should be remembered in survey.

1. Azimuth test: It is done to make the line of sight perpendicular to the horizontal axis.

2.  Spire test: It is a test carried out to remove error due to non-perpendicularity of the horizontal axis and the vertical axis in surveying Instrument.                     
3. Cross- Hair ring test: This test is done to make the vertical cross-hair to lie in a plane perpendicular to horizontal axis.

4. Vertical arc test: It is done to make the vertical circle indicate zero when the line of sight is perpendicular to the vertical axis.

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