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).
Graphs comparing the high and low pressure sides of a standard damper under specific test conditions.
| Identifier | WestWitteringFiles\S\June1928-August1928\ Scan075 | |
| Date | 9th July 1928 guessed | |
| SHEET II STANDARD DAMPER .015" AIR VENT 60/80 LOADS 200 CYCLES/MIN. OIL 20°C HIGH PRESSURE 200 LBS/□" SLOW RUNNING LOW PRESSURE 200 LBS/□" SLOW RUNNING COMPARISON OF HIGH AND LOW PRESSORE SIDES WHEN BUMP OCCURS ON H.P SIDE MARGIN FOR FILING | ||