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).
Graph plotting the variation of maximum ball pin load against axle velocity for a 7.5 inch lever under various conditions.
| Identifier | ExFiles\Box 56\1\ Scan039 | |
| Date | 9th January 1931 guessed | |
| SHEET VII VARIATION OF BALL PIN LOAD WITH AXLE VELOCITY 7.5" LEVER VALVES 2G. G4. MAXIMUM BALL PIN LOAD 500 400 300 200 100 0 LONG STROKES HIGH PRESSURE SHORT STROKES HIGH PRESSURE LONG & SHORT STROKES LOW PRESSURE AXLE VELOCITY 7.5" LEVER FT/SEC. 1 2 3 | ||