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).
Schematic diagram of a Double Piston Damper with various valve configurations and component details.
| Identifier | Morton\M19\ img080 | |
| Date | 1st June 1931 | |
| Hs{Lord Ernest Hives - Chair} 369 1-6-31 DAS SCHEMES L.P.R SURGE CHAMBERED OUT VALVE DIA REDUCED SPRING CHAMBER AIR RELEASE MAX .005" RADIAL CLEARANCE RR [Stamp] ROLLS ROYCE LIMITED [Stamp] PRINT ... [Stamp] 4 JUN 31 [Stamp] DEPT DOUBLE PISTON DAMPER VALVE VARIATIONS H.P. VALVE HOLE. L.P. VALVE HOLES DELCO .156 DIA BALLS .050 LIFT .300" .125 DIA AIR VENT BALL VALVES .161 DIA .075 DIA .095 DIA | ||