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 showing the variation in maximum ball pin load available for a Delco adjustable damper.
| Identifier | ExFiles\Box 28\1\ Scan193 | |
| Date | 30th January 1931 guessed | |
| DELCO ADJUSTABLE DAMPER VARIATION IN MAX. BALL PIN LOAD AVAILABLE, USING ADJUSTMENT. Nº1 LEAK. THE SMALLEST Nº4 LEAK. THE LARGEST MAX. BALL PIN LOAD. LBS. AXLE VEL. FT/SEC LARGE BALL PIN STROKES 4” SMALL BALL PIN STROKES 1” 400 300 200 100 .5 1 1.5 1 3 4 | ||