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The metallic composition for standard pistons, noting the experiment is superseded.
| Identifier | ExFiles\Box 37\3\ scan 029 | |
| Date | 7th September 1918 | |
| To EFC. from EH. EH/AT7.9.18. X.3198.-STANDARD PISTONS IN MR. HALL'S SPECIAL METAL - 1.16% nickle 5% copper .85% antimony. This experiment is superseded by a later mixture of metal to a different analysis, under X.3198A. EH. | ||