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).
Photograph showing the condition of internal silencer parts after a test.
| Identifier | ExFiles\Box 108\3\ scan0221 | |
| Date | 12th May 1938 guessed | |
| EXHAUST SYSTEM. Condition of Internal Silencer Parts after Test. | ||