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).
Extract from Mr. Minchin's letter comparing the performance of tungsten and platinum points.
| Identifier | ExFiles\Box 35\6\ scan 258 | |
| Date | 9th March 1927 | |
| X2894 Extract from Mr. Minchin's letter M/5. 9th March, 1927. X.4040. "Re the tungsten points, I must say that these are now doing all right and are not pitting and are doing very much better than the original platinum points, though the third set of platinum that I had, which were taken off to fit these tungsten ones were also doing extremely well up to the time of their being taken off. I still have a feeling that I prefer the platinum points, but in view of the above it is difficult for me to give you any justification for doing so." | ||