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 regarding the fusing of glaze on Model C plugs during engine testing.
| Identifier | ExFiles\Box 162\6\ img017 | |
| Date | 8th December 1921 | |
| X4425 Lodge Plugs Limited, Rugby. Directors: J.{Mr Johnson W.M.} Alfred Hopps Bernard Hopps Alex 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). YOUR REF. Hs{Lord Ernest Hives - Chair}9/LG OUR REF. AML/MAW Messrs. Rolls-Royce Limited. Nightingale Road, DERBY. Date 8 December 1921 FOR THE ATTENTION OF MR. HIVES ----------------------- Dear Sirs, In reply to your letter of the 5th inst., we have received the six Lodge Model C plugs which you have been testing on your small car engine. We note that you complain that the steatite insulators in these plugs have fused. What has actually happened is that the glaze on the outside of these insulators has fused but not the steatite itself. We should like to know whether these plugs were sent back to us on account of their appearance, or because they gave faulty ignition. If they gave faulty ignition, would you please let us know exactly what the effect was. The glaze that we put on these insulators does not begin to soften until 700° C. It has, in fact, a higher melting point than the pre-war German insulators by 200° C. There are manufacturing difficulties in the way of using a higher temperature glaze, and in the ordinary way we should (Continued) [Logos on left side: THE SOCIETY OF MOTOR MANUFACTURERS & TRADERS LTD, AERO WORKS COVENTRY 1910, THE MOTOR TRADE ASSOCIATION MTA, SBAC, NATIONAL SCHEME FOR DISABLED MEN] ENCLOSURE No 671 "JUSTSO" | ||