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 analysis and testing of liners for aluminium brake drums.
| Identifier | ExFiles\Box 141\1\ scan0075 | |
| Date | 23th November 1935 | |
| X1180 Exptl. Dept. 23rd November,1935. Hs{Lord Ernest Hives - Chair}/AFM.{Anthony F. Martindale}6/KW. J.N. Longley, Esq., Chief Chemist, Messrs. Ferodo Limited, Chapel-en-le-Frith. Your Ref: JNL/KM. Dear Mr. Longley, When I came over to see you with Mr. Grylls I believe you promised to examine for us the photomicrographs of the two types of liners we are going to try in aluminium brake drums. The laboratory have now completed a report on one of these, the "Brico" liner in "Brimal" austenitic iron, and I enclose a copy of their report and also the photos. I shall be very interested to know what you think of this material. We have no facilities here for measuring the co-efficient of expansion of these liners, and in view of your experience with a material alleged to have a high co-efficient, I am wondering if you would be so kind as to measure this for us if I sent you the liners. If you can do this for us, perhaps you would write or 'phone me on Monday when you return and I will send the liners straight away. I have only one spare liner in N.M.C. steel (which is said to have an expansion co-efficient of 21 x 10^-6 per degree C.) so I will wait until I hear from you before I have it cut up for microstructure specimens. I am not expecting to be able to send you the complete drums, etc., for two or three weeks. | ||