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 measured rating of rubber buffers for a 40/50 rear axle, plotting load against deflection.
| Identifier | ExFiles\Box 68\2\ scan0218 | |
| Date | 30th March 1928 guessed | |
| MEASURED RATING OF RUBBER BUFFERS 40/50 REAR AXLE LOAD - LBS : 1200 1000 800 600 400 200 0 DEFLECTION - INCHES : 0 .1 .2 .3 .4 .5 .6 CONTINENTAL RUBBER 1.00" DEEP STANDARD RUBBER 1.500" DEEP | ||