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 Silentbloc Ltd. regarding the rubber hardness and pricing of anti-vibration mountings.
| Identifier | ExFiles\Box 117\1\ scan0325 | |
| Date | 25th March 1939 guessed | |
| COPY. Silentbloc, Ltd., Victoria Gardens, Ladbroke Road, Notting Hill Gate, LONDON.W.11. Messrs. Rolls Royce Ltd., DERBY. Dear Sirs, We were interested to hear the results of your tests on the Silentbloc anti-vibration Mountings with rubbers of Shore Hardness 70-75 which we recently supplied. There will be no difficulty in supplying further units made with rubber of hardness 65 - 70 but, since our standard hardness is 51-55 and not 60 as mentioned in your letter, it might be desirable from the point ofview of noise reduction to use a slightly softer quality, say 60-65. For any given quantity there is no difference in price between mountings made with the various qualities of rubber mentioned above. Yours faithfully, SILENTBLOC LIMITED. S.W.JELLEY. (IND). | ||