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).
Acceptance of straight carbon steel for a 13.2 mm barrel.
| Identifier | ExFiles\Box 170\4\ img016 | |
| Date | 17th July 1940 | |
| - 2 - 15 Rm{William Robotham - Chief Engineer}/FJH.{Fred J. Hardy - Chief Dev. Engineer}1/ML.17.7.40. Cont'd.{John DeLooze - Company Secretary} A straight carbon steel would be accepted for the 13.2 mm. barrel if the physicals were up to the above figures. Rm{William Robotham - Chief Engineer}/FJH.{Fred J. Hardy - Chief Dev. Engineer} | ||