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).
Diagram showing the performance characteristics of an aluminium damper with 1 1/2 diameter pistons at different temperatures.
| Identifier | ExFiles\Box 152\2\ scan0169 | |
| Date | 9th February 1940 | |
| R.R. ALUMINIUM DAMPER. 1 1/2 DIA. PISTONS. 70 RPM No LEAK WAKEFIELDS F.{Mr Friese} 56°C ROLLS-ROYCE LTD. PRINT ROOM 9 FEB 1940 DERBY. 20°C REBOUND BUMP RM{William Robotham - Chief Engineer}606 | ||