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).
Letter to The Lodge Sparking Plug Co. regarding the return of 6 fused Steatite Sparking Plugs from a small car engine.
| Identifier | ExFiles\Box 162\6\ img015 | |
| Date | 5th December 1921 | |
| X4425 Hs{Lord Ernest Hives - Chair}9/LG. 5th. Dec. 1921. The Lodge Sparking Plug Co., Rugby. Dear Sirs, We are returning to you 6 Steatite Sparking Plugs which we have run on the small car engine. You will notice that the steatite insulators on these plugs have fused. We should like to know whether you have any other plug with the steatite insulator which will stand more heat. Yours faithfully, | ||