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 Ferodo Limited regarding the testing of various brake drum materials including carbon steel, cylinder iron, and 'Lepaz' iron.
| Identifier | ExFiles\Box 141\1\ scan0107 | |
| Date | 5th March 1936 | |
| X 1180 Exptl. Dept. Hs{Lord Ernest Hives - Chair}/AFM.{Anthony F. Martindale}14/KW. 5th March, 1936. J.N.Longley Esq., Chief Chemist, Messrs. Ferodo Limited, Chapel-en-le-Frith. Dear Mr. Longley, I am sending you under separate cover the 0.9% carbon steel brake drum, as promised. I am also sending another kind of C.I. drum, made of R.R. cylinder iron, which, if you have time when all the other tests are finished, you might try for fading. I enclose some photomicrographs, and our Laboratory Report. When Lake & Elliot's metallurgist was last here he promised in spite of protests to try to reproduce the structure you have been advocating. His efforts, judging by specimens 118 and 119, which I received recently, have not been wholly successful, and I should like you to confirm, or otherwise, my impression that this material would not be suitable for rubbing against Ferodo. If you find it desirable I can let you have some drums with this structure. I also enclose our pictures of "Lepaz" Iron, and the makers' booklet, in which they print a photomicrograph. Since you have already tested this material, perhaps you can give me your opinion of it. If you approve, I can let you have two drums made of "Lepaz". When the tests you are so kindly making for us are a little more advanced, I should be gladto come over and discuss the results with you. Kind regards, Yours very truly, FOR ROLLS-ROYCE LIMITED. | ||