As the sides slope at 1 degree as it rises, it is going to take a structural survey with precise equipment to confirm any tilt — a photographic survey won’t provide any true indication.
They renovated it recently and surveyed all the stuctural in-place characteristics.
When it was being finished in the late 1800s after the civil war lull in construction, the workers topping it out were shaken by an earlier earthquake that was felt from there to Ohio.
A two degree change doesn’t sound like much, but if one side is reduce by two to three degrees and the other is increased by that much, it would seem you could perceive it.
Even a two degree change would make one side a three degree positive tilt, with the other side having a negative one degree tilt. I believe that would be perceivable if you were standing at the right angle at the right distance.
If it increased to three or four degrees, it would seem the tilt would be impossible to miss.
As for the exact extent, those measurements you mentioned would be very useful.
Hey, I may be wrong.
Thank you for mentioning the measurements at the restoration and the bit about the original construction timed quake. Interesting stuff.