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 three disassembled metal engine components, including a cover with six cutouts.
| Identifier | ExFiles\Box 138\1\ scan0176 | |
| Date | 17th May 1938 guessed | |
| SS{S. Smith}539 | ||