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).
Short memo confirming the material composition of a bearing.
| Identifier | ExFiles\Box 115\3\ scan0267 | |
| Date | 15th August 1938 | |
| 1020. Pede SWD2 Rm.{William Robotham - Chief Engineer} H1/HEG. 1/JM.{Mr Morley} 15.8.38. Laboratory. Re. : Rm{William Robotham - Chief Engineer} 4/R 22.7.38. The bearing was AC7 material. H1/HEG. [Signature] | ||