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).
Recommendation to use tungsten points instead of platinum for battery ignition systems.
| Identifier | ExFiles\Box 35\6\ scan 120 | |
| Date | 3rd April 1934 | |
| X2494 Extract from R2/M3.4.34. BATTERY IGNITION. X.3199 Tungsten points are better and more reliable and a fraction of the cost compared with platinum; throw away these when damaged. | ||