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 over a level crossing.
| Identifier | Morton\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. DAMPER LOADS. 90/90 LBS. ROAD SPEED (M.P.H) 30, 35, 40, 45, 50 MAXIMUM REAR AXLE MOVEMENT COMPRESSION REBOUND NORMAL AXLE POSITION Normal Buffer Clearance KEY: (Solid Line) H.P. VALVE DRILLED .055" DIA. (Dashed Line) STANDARD PLAN VALVES | ||