Is the pendulum still there?
Great article. Took me right back to 1985 when, as a 17 year old, I did two weeks work experience at Express Lifts in Northampton. In between wiring up lift controllers on the shop floor we were proudly taken up the, then new, tower. The most fascinating part was a pendulum mounted at the top that appeared to be swinging from side to side. In fact it was stationary and the tower itself was moving in the wind!