All changes to tower
| Date | Change | Source |
|---|---|---|
| 20 Aug 2022 | Frame added | https://www.flickr.com/photos/norfolkodyssey/2241797799/in/photostream/ via Neal Dodge |
| 1: weight, note, nominal, diameter, founder, canons, and turning added | Ranald Clouston papers 1990 via Neal Dodge |