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).
Correspondence from Dunlop about the hardness of experimental rubber blocks, compound No. 4 and No. 5.
| Identifier | ExFiles\Box 65\4\ scan0121 | |
| Date | 8th December 1928 | |
| DUNLOP RUBBER CO.,LTD. TELEGRAPHIC ADDRESS: "DUNLOPS, PHONE, BIRMINGHAM" TELEPHONE: BIRMINGHAM CENTRAL 4108 P.B.E. 25 LINES YOUR REF: OUR REF: FBJ/FHC/7. Phys. Lab. Telephone Ext. 339. FORT DUNLOP ERDINGTON BIRMINGHAM W.A.Robotham Esq., Messrs. Rolls Royce Ltd., D E R B Y. 8th December, 1928. Dear Sirs, In your letter of the 4th December, you say that you have found the latest experimental blocks we sent to you, to be softer than the blocks originally standardised. We cannot understand this as compound No.5. is quite definitely and distinctly harder than compound No.4. We shall be very glad if you will return one of the blocks of compound No.5 so that we can check up and be sure that the correct mixing was sent to you. We thank you for the drawing showing the general arrangement of the engine foot but we should apparently require two further prints if we are to match the conditions of use for obtaining our deflection curves. (F.78141 and F.78114.) I think it would be advisable if a representative from here visited you at Derby so that the whole position could be explained to him in greater detail. If this were done I think we should avoid a lot of explanatory correspondence and reach finality more quickly. Yours faithfully, FOR DUNLOP RUBBER CO. LTD., | ||