From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Cover note regarding the details and position of various experimental guns.
| Identifier | ExFiles\Box 176\1\ img119 | |
| Date | 27th November 1940 | |
| To Sg.{Arthur F. Sidgreaves - MD} Hs.{Lord Ernest Hives - Chair} Va. A.D. Rm.{William Robotham - Chief Engineer}S/sh.27.11.40. A-PIECE & EXPERIMENTAL GUNS. Herewith exact details of the position of the various experimental guns by numbers, which should be attached to Rm.{William Robotham - Chief Engineer}S/sh.27.11.40. RM.{William Robotham - Chief Engineer} | ||