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 Sparking Plug Company regarding a test on two different types of sparking plugs for cooling purposes.
| Identifier | ExFiles\Box 79\1\ scan0216 | |
| Date | 20th January 1920 | |
| LODGE PLUGS LIMITED, X601 FORMERLY The Lodge Sparking Plug Company Limited. Rugby. Telegrams: "Lodge Rugby" Telephone: Rugby 235. UNDER GOVERNMENT CONTROL. YOUR REF OUR REF AML/MAW Date 20th January 1920. Mr. Hives, C/o Messrs. Rolls-Royce Limited, Nightingale Road, D E R B Y. Dear Mr. Hives, We have been having a discussion as to the best methods of cooling sparking plugs, and the question has arisen as to whether there is any advantage in drawing air through a sparking plug, and I was wondering if you could conveniently manage to run a small test to decide this question. I am enclosing two sparking plugs made exactly the same, except that in the case of one, the plug has the ordinary solid centre pin; while in the case of the other, the centre pin is drilled right through, and is fitted at the terminal end with an automatic inlet valve. I should like you, if possible, to do this test on an engine on which they will get sufficiently hot to pre-ignite, and see if you can detect any improvement in one pattern over the other. It may be that when using the plug with the air inlet, some compensation will be needed at the carburetter. I trust that this won't be any bother, and beg to remain, Yours faithfully, Alec M Lodge 2 Enc: (Sparking plugs) [Stamp in bottom left corner] ENCLOSURE NO 403 [Logos on left margin] SOCIETY OF MOTOR MANUFACTURERS & TRADERS THE CYCLE AND MOTOR CYCLE MANUFACTURERS AND TRADERS UNION LD. INCORPORATED 1910 THE MOTOR TRADES ASSOCIATION S.B.A.C SOCIETY OF BRITISH AIRCRAFT CONSTRUCTORS ENGINEERING EMPLOYERS' FEDERATION 1896 | ||