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).
Performance diagrams for a standard damper at various strokes and running speeds.
| Identifier | WestWitteringFiles\S\June1928-August1928\ Scan090 | |
| Date | 18th July 1928 guessed | |
| 13" LEVER STANDARD DAMPER .024 VENT 20°C OIL TEMP 60/80 LOAD 200 CYCLES/MIN. SLOW RUNNING 40 CYCLES/MIN APPROX Top Left Graph: 200 LBS/SQ" H.P. 3.7" STROKE Top Right Graph: 200 LBS/SQ" SLOW RUNNING L.P. 3.7" STROKE Middle Left Graph: 330 LBS/SQ" SLOW RUNNING H.P. 11" STROKE Middle Right Graph: 330 LBS/SQ" SLOW RUNNING L.P. 11" STROKE Bottom Left Graph: 200 LBS/SQ" SLOW RUNNING H.P. 7" STROKE Bottom Right Graph: 200 LBS/SQ" SLOW RUNNING L.P. 7" STROKE Handwritten at bottom: Filmy Store | ||