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 graphs for a Standard Damper under various stroke, pressure, and running conditions.
| Identifier | ExFiles\Box 28\1\ Scan135 | |
| 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 / ☐" H.P. 3.7" STROKE A Top-right graph: 200 LBS / ☐" L.P. 3.7" STROKE SLOW RUNNING A Middle-left graph: 330 LBS / ☐" H.P. 11" STROKE SLOW RUNNING A Middle-right graph: 330 LBS / ☐" L.P. 11" STROKE SLOW RUNNING A Bottom-left graph: 200 LBS / ☐" H.P. 7" STROKE SLOW RUNNING A Bottom-right graph: 200 LBS / ☐" L.P. 7" STROKE SLOW RUNNING A Handwritten at bottom: Filling Stroke | ||