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).
Page 2 of a letter from Lodge Plugs Ltd regarding the insulator shape of their spark plugs.
| Identifier | ExFiles\Box 162\6\ img029 | |
| Date | 9th February 1922 | |
| Page 2 L. S. P. Co. Ltd. Date 9. 2. 22 Messrs. Rolls-Royce Limited. of these plugs sufficiently good, but if this type of plug is satisfactory on your engine it would give us an idea of the best shape for the sparking end of the insulator. Yours faithfully, LODGE PLUGS LIMITED. Alex Lodge DIRECTOR. 1 Enclo: (Invoice) 6 Model CD plugs sent under separate cover. | ||