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).
Analysis of the chemical composition of a nickel centre from a sparking plug.
| Identifier | ExFiles\Box 162\6\ img083 | |
| Date | 4th July 1925 | |
| Hs.{Lord Ernest Hives - Chair} +4425 H13/EA4.7.25. Laboratory. Re Nickel Centre of Sparking Plug. Analysis. Iron -------- 0.35 % Manganese ---- 0.24 % Other Impuruities Negligible. Hl. He | ||