Why will my plumb line not stop moving when i want to mark out a line on a 250m high tower from top to bottom?

Question

Why will my plumb line not stop moving when i want to mark out a line on a 250m high tower from top to bottom?

Answer 1

The building is probably swaying.

Answer 2

The wind?

Answer 3

High towers have to swing in the wind in order to minimise stress in the structure which could result in collapse.

Answer 4

Wind and building sway, since you are a painter you need plumb line other wise you will use theodolite machine

Answer 5

This is a joke? Why on earth would you want to put a PL down a building that high?

Answer 6

Either the wind is blowing, or there is a draft, or you have set up vibrations in the line that haven't died down, or the line is acting like a 250 metre long pendulum.