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).
Note on observing a pre-igniting plug inside a cylinder.
| Identifier | ExFiles\Box 33\5\ Scan102 | |
| Date | 9th September 1916 guessed | |
| -2- With theplug in the side it is possible to look into the cylinder when the exhaust valve is open and see the plug which is pre-igniting red hot. EH. | ||