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).
Laboratory report on the impurities found in a Cadmium Rod sample.
| Identifier | ExFiles\Box 44\5\ Scan006 | |
| Date | 2nd September 1925 guessed | |
| X4049 EFC. H14/EA5225 Laboratory. Re Sample of Cadmium Rod. This was found to contain about 0.04% Iron and only negligible traces of other impurities including Zinc. H1. HE | ||