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).
The testing of sparking plugs from Sg's car.
| Identifier | ExFiles\Box 109\5\ scan0040 | |
| Date | 25th April 1938 | |
| To Rm.{William Robotham - Chief Engineer} from Mx.{John H Maddocks - Chief Proving Officer} 664 25.4.38. Sparking Plugs From Sg{Arthur F. Sidgreaves - MD}'s. car. Tested in 27.G.VI. No sign of misfiring. Subsequently tested in Test Dept. pressure rig and several of them spark 'inside' at 60 lbs. pressure. Mx.{John H Maddocks - Chief Proving Officer} | ||