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).
Technical observation on engine cylinder mixture and spark plug condition.
| Identifier | ExFiles\Box 72\1\ scan0066 | |
| Date | 22th October 1928 guessed | |
| -2- stronger than the mixture in the other cylinders. This observation is confirmed by the condition of the plugs in practically every car which is tested. COPY UTD. Carl | ||