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 Lodge Plugs Ltd. regarding the testing of various spark plug types.
| Identifier | ExFiles\Box 162\6\ img323 | |
| Date | 26th June 1936 | |
| 86002a. Hs{Lord Ernest Hives - Chair}/Wst.1/MA. 26th June, 1936. Messrs.Lodge Plugs, Ltd., Rugby. For the attention of Mr.Hopps. Dear Sir, In reply to your letters of the 25th instant, the following is the position :- (a) Bentley sparking plug type X512. This plug has been tested on our Bentley engine with satisfactory results but in order to make it suitable for better idling performance it will be necessary to modify the electrode on similar lines to X523. (b) 25/30 HP. engine plugs type X525. We wish to proceed testing this but only required in the first instance one dozen and we are arranging to send you an official order for these. (c) Aluminium Oxide insulated plugs type X515. We were under the impression that only one of these was received for test and this one in question is now in process of being tested on the Single Cylinder Engine. We hope to be in a position to give you the results of this test in the near future. | ||