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 replacement of tungsten points with platinum points on a component.
| Identifier | ExFiles\Box 35\5\ scan 112 | |
| Date | 25th June 1920 | |
| R.R. 199 (250T) (SD576 19-7-17) MP180865 X 2894 25.6.20. EFC. X.2894 X.3764. Tungsten points herewith are off 4 EX. 4 EX is now fitted with platinum points. The condenser used with these tungsten points is quite O.K. L.F. | ||