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).
Material selection for ignition plugs, suggesting silicon bronze.
| Identifier | ExFiles\Box 79\1\ scan0138 | |
| Date | 16th September 1918 | |
| To EH. from R.{Sir Henry Royce} c. to CJ. 16th Sept. 1918. R3/G16918. RE IGNITION PLUGS X.601. We presume that the copper is used owing to its high thermal conductivity. If you find this insufficiently stiff, you might try silicon bromze, which, I believe, has very nearly the same conductivity but with very much higher elastic limits. R.{Sir Henry Royce} | ||