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 showing the effect of drilled valves on maximum rear axle movement during a level crossing test.
| Identifier | ExFiles\Box 182\M19\ img157 | |
| Date | 20th April 1931 guessed | |
| R.R. HYDRAULIC DAMPERS. EFFECT OF DRILLED VALVES ON MAXIMUM REAR AXLE MOVEMENT. BURTON ROAD LEVEL CROSSING. 25 EX CAR. LOW RATING ROAD SPRINGS. NORMAL BUFFER CLEARANCE DAMPER LOADS 90/90 LBS. H.P. VALVE DRILLED .055" DIA. STANDARD PLAN VALVES ROAD SPEED (M.P.H.) NORMAL AXLE POSITION COMPRESSION REBOUND MAXIMUM REAR AXLE MOVEMENT | ||