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).
Blueprint of a pipe fitted with a resonance chamber and a top hat type baffle for a silencer.
| Identifier | ExFiles\Box 169\3\ img086 | |
| Date | 8th December 1932 guessed | |
| Hs.{Lord Ernest Hives - Chair} 766 PIPE FITTED WITH RESONANCE CHAMBER TO RR SCH: 293 TO BE DETACHABLE SWAN NECK FLANGE 47.5 DRILLED 80 HOLES DIAM 6.00" 8.00" TOP HAT TYPE BAFFLE 4.00 DIA DRILLED 88 HOLES .250 DIA. 8 ROWS OF HOLES ROWS ARE .500" APART BAFFLE FITTED SO THAT THE HOLES ARE OPPOSITE SWAN NECK OUTLET I.E. AT BOTTOM OF SILENCER | ||