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 The Lodge Sparking Plug Co. Ltd. regarding experimental KR3 plugs with different insulating tubes.
| Identifier | ExFiles\Box 79\1\ scan0141 | |
| Date | 30th September 1918 | |
| Page 2. L. S. P. Co. Ltd. Date 30. 9. 18. you six KR3 plugs, with black insulating tubes in place of the top mica washers, and six with brown insulating tubes. We should be glad to hear if you have any more information to give us about this material and whether you consider it as satisfactory as the mica washers. We thank you in anticipation of any information you can give us with reference to these experimental plugs. We beg to remain, Yours faithfully, THE LODGE SPARKING PLUG CO. LTD. [Signature] DIRECTOR | ||