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).
Testing of additional plugs on Ethyl.
| Identifier | ExFiles\Box 150\1\ scan0253 | |
| Date | 8th December 1936 | |
| 1282 To Rm {William Robotham - Chief Engineer} /Mths. {Reg Matthews} from Rm {William Robotham - Chief Engineer} /Swdl. {Len H. Swindell} Rm {William Robotham - Chief Engineer} /Swdl. {Len H. Swindell} 1/AP.8.12.36. In addition to the plugs which you are trying out on Ethyl will you please include the 6-AC.X399 which I am sending. Rm {William Robotham - Chief Engineer} /Swdl. {Len H. Swindell} | ||