All changes to tower
| Date | Change | Source |
|---|---|---|
| 30 Sep 2024 | Fr1: material amended, maker added; Fr1 mods added | Jack Pease from the Christopher Dalton papers |
| 18 Nov 2020 | fr1: details added | Chris Pickford via e-mail |
| 17 Nov 2020 | 1-5: frameid added; 1,2,4,5: canon info added | Chris Pickford via 00014132 |
| 15 Nov 2020 | 1-5: nominal added | Nigel Taylor via 00014124 |
| 17 Oct 2020 | 1,2,4: diam added; 3,5: diam amended | David Sloman via 00014066 |
| 3 Jan 2014 | 4,5: historically important | David Knight via e-mail |
| 25 Jan 2004 | URL changed | Gary J Sheppard: SDGR webmaster via e-mail |
| 8 Jan 2004 | URL added | Gary J Sheppard: SDGR webmaster via e-mail |