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).
Repairing two failed contact breakers from Watford EW6 magnetos by replacing the platinum points with tungsten.
| Identifier | ExFiles\Box 65\3\ scan0426 | |
| Date | 4th October 1930 | |
| X7791. Roy.{Sir Henry Royce} from EFC. EFC2/ADL4.10.30. X.7791. WATFORD EW6. MAGNETOS. We hand you herewith two contact breakers which have failed on experimental test bed engines due to the contact points burning away. Will you please arrange for these to be repaired, fitted with tungsten lever and screw instead of platinum and returned to us. Own expense EFC/HEW | ||