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 The Lodge Sparking Plug Company concerning the testing of experimental KR4 and KR5 sparking plugs.
| Identifier | ExFiles\Box 79\1\ scan0127 | |
| Date | 31th August 1918 | |
| X601 The Lodge Sparking Plug Company Limited. Rugby. Telegrams: "Lodge Rugby" Telephone: Rugby 235. UNDER GOVERNMENT CONTROL. Messrs. Rolls-Royce, Ltd. Nightingale Road D E R B Y RECEIVED SEP 2 1918 YOUR REF OUR REF AML/FB Date 31 August 1918 For the attention of Mr. Hives Dear Sirs, We thank you for your letters of August 15th, 16th, & 21st, with reference to KR4 and KR5 experimental sparking plugs, and we are much obliged for the information you give. We have carefully examined and tested the 5 KR5 and 3 KR4 plugs, and find that they are in good order with respect to gas-tightness, indicating that this method of construction is sound, but although some of these plugs have run a considerable time yet we think that the result indicates that copper is not a suitable material for the centre pins. We shall be interested to know whether you have run the K.L.G. Model CB plugs for as long a time as these plugs and under similar conditions, and if so whether you find the copper deteriorates after a certain time. We shall be glad to hear in due course | ||