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1. Set up the theodolite on a firm and levelled tripod at a convenient location. 2. Centre the theodolite on the tower or structure to be checked. 3. Take a front sight on the top of the tower. 4. Rotate the instrument to the left and take a rear sight on the same point. 5. Measure the vertical anglRead more
1. Set up the theodolite on a firm and levelled tripod at a convenient location.
See less2. Centre the theodolite on the tower or structure to be checked.
3. Take a front sight on the top of the tower.
4. Rotate the instrument to the left and take a rear sight on the same point.
5. Measure the vertical angle between the two readings.
6. Calculate the deviation from true vertical using trigonometry and the observed vertical angle.