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).
Drawing of an air silencer with dimensions.
| Identifier | ExFiles\Box 126\2\ scan0165 | |
| Date | 18th November 1938 guessed | |
| AIR SILENCER SS{S. Smith}246 8.975 DIA 8.192 DIA 6.450 DIA 8.582 DIA 1 15/16" DIA 2 13/16" DIA 8.300 DIA 7.500 DIA C.P 1.175 1/8" 3.690 3/4" 8.575 3.930 41 SLOTS .430 WIDE X .800 LONG | ||