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).
Stating that Sphinx Sparking Plugs were previously found to be unreliable and of poor quality.
| Identifier | ExFiles\Box 79\2\ scan0168 | |
| Date | 15th August 1919 | |
| R.R. 235 B (200 T) (S.F. 103 25-10-18) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2241. To Bn.{W.O. Bentley / Mr Barrington} from EH. X.1026. EH7/LG15.8.19. With reference to attached, we have not tried Sphinx Sparking Plugs for some years but the last we had were not very reliable and looked cheap and nasty. EH. | ||