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).
Two photographs showing different angles of an engine.
| Identifier | ExFiles\Box 102\1\ scan0061 | |
| Date | 10th December 1931 guessed | |
| 2 19 | ||