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 Dr. J.C. Morrison discussing the results of tests on a new silencing system and proposing two schemes for interference pipes.
| Identifier | ExFiles\Box 134\1\ scan0026 | |
| Date | 5th October 1937 | |
| 1129. Rm{William Robotham - Chief Engineer}/Ed.{J. L. Edwards}13/MH.{M. Huckerby} 5th. October 1937. Dr. J.C. Morrison, The University, Glasgow. Dear Dr. Morrison, Many thanks for your letter, and I must opolgise for not answering before. We have had an initial run on your silencing system, and subject to verification of results it appears very good, being about 40% better than standard Bentley. It appears, however, to be rather noisier than the Bentley silencer, and I am trying a different type of expansion chamber on the end. Another point is that in the event of our fitting this system in a car, it would naturally have to be tidied up a bit, and I should like your opinion on the effectiveness of the following. (1) Interference pipes. Two schemes are as under - | ||