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 load versus deflection rating of a road spring and buffer.
| Identifier | WestWitteringFiles\S\March1928-May1928\ Scan074 | |
| Date | 30th March 1928 guessed | |
| RATING OF ROAD SPRING + BUFFER LOAD LBS 1600 1400 1200 1000 800 600 400 200 0 DEFLN. INS 1 2 3 4 5 -- MORE DESIRABLE MEANS OF BRINGING THE AXLE TO REST 1800 LBS REAR SPRING RATING 150LBS/1" AT WORKING END AXLE TOUCHES BUFFER SPACE OCCUPIED BY COMPRESSED BUFFER FRAME LEVEL | ||