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).
Cross-section drawing of a Double Piston Damper and Sylphon Chamber Pressure Release with annotations.
| Identifier | WestWitteringFiles\W\May1931-August1931\ Scan054 | |
| Date | 6th June 1931 | |
| GROOVE '.075" RAD. ADDED TO EFFECT RELEASE. THIS HOLE WAS FOUND TO REQUIRE RADIUSING TO DRG: (.187") DOUBLE PISTON DAMPER. SYLPHON CHAMBER PRESSURE RELEASE. | ||