How to measure whether the column is inclined with theodolite?

Look back at one end of the column and lock the horizontal lock of the theodolite to prevent it from rotating horizontally.

Then look forward at the other end of the column to see if the back view and the front view are in a straight line.

That's it.

The above method is not very accurate.

If possible, you can ask someone to compare the ruler with you on the front, so that you can read it accurately, and then you can know how much the column deviates and whether it is within the specification range.

Of course, more measurements are needed.

To ensure accuracy.