All changes to tower
| Date | Change | Source |
|---|---|---|
| 15 Feb 2012 | 4: historically important | David Knight via e-mail |
| 30 Jan 2011 | 1: founder amended; 2: diam, wt added; 5: canon info added | John Baldwin via database |
| 1-5: frame id added; frame info added | John Baldwin via database |