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 from Lodge Plugs Ltd. regarding the dispatch of experimental Model X317 spark plugs for testing.
| Identifier | ExFiles\Box 162\6\ img191 | |
| Date | 2nd December 1932 | |
| LODGE PLUGS LTD. RUGBY COPY to Mr. Robotham. T. W. Hancock Esq., Hotel de France, Chateau Roux, Andre, FRANCE. BH/EW. 2nd December 1932. Dear Mr. Hancock, At the request of Mr. Robotham we are sending you under separate cover 6 Model X317. plugs. These are an experimental type similar to the HD{Mr Hayward/Mr Huddy}15. but having stepped mica and the new type two-point spark-gap, the object being to give you a plug to withstand slightly more heat than the HD{Mr Hayward/Mr Huddy}15. while at the same time it should also withstand slightly more carbon due to the steps in the mica. We should be very much obliged if you would have these plugs tested in comparison with the HD{Mr Hayward/Mr Huddy}15's, and advise us if they show any advantage. Yours faithfully, LODGE PLUGS LIMITED. DIRECTOR. ENCLOSURE No 538 'JUSTSO' | ||