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 Limited discussing the testing results of experimental spark plugs.
| Identifier | ExFiles\Box 162\6\ img028 | |
| Date | 9th February 1922 | |
| X4425 Lodge Plugs Limited. Rugby RECEIVED 9 FEB 1922 Directors: J.{Mr Johnson W.M.} Alfred Hopps Bernard Hopps Alec M.{Mr Moon / Mr Moore} Lodge F.{Mr Friese} Brodie Lodge Telegrams: "Lodge, Rugby." Telephone: Rugby 276 (2 lines). Private Branch Exchange. Code Used: A.B.C. (5th Edition). Messrs. Rolls-Royce Limited, Nightingale Road, D E R B Y. YOUR REF. Hs{Lord Ernest Hives - Chair}/LG1 OUR REF. AML/MAW Date 9 February 1922 FOR THE ATTENTION OF MR. HIVES Dear Sirs, In reply to your letters of January 25th and February 7th, we have now tested the 5 Lodge Model Z.27 plugs. We find that they were all rather badly oiled up inside, but otherwise 4 were in perfect order and 1 failing to spark. At the moment we have not found out whether the failure to spark is due to soot inside or a broken insulator. Confirming our telephone message of this morning we have sent you 6 more steatite plugs, Model CD, for your tests. As far as withstanding heat and oil is concerned, we should say these plugs are in between the first pattern and the second pattern that you tested. We are getting out a detachable pattern of plug with a steatite insulator, and these Model CD are the first experimental ones, and we want you to bear in mind that these plugs are purely experimental, as we do not consider the detachability (Continued) | ||