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 a detailed view of an engine's carburettor and ignition system.
| Identifier | Morton\M13.2\ img134 | |
| Date | 18th November 1931 guessed | |
| EARLY IGNITION LATE | ||