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).
Blueprint graph showing the results of two rear road spring rating tests.
| Identifier | WestWitteringFiles\S\September1928-October1928\ Scan049 | |
| Date | 8th September 1928 | |
| REAR ROAD SPRING RATING TESTS - F78536 NOT CADMIUM PLATED ROYCE, LIMITED TEST ROOM, 8 SEP 1928 D'BY.{R.W. Bailey - Chief Engineer} TEST 1 TEST 2 RATING LBS / 1" DEFLN 200 150 APPLIED LOAD POUNDS 0 200 400 600 800 1000 1200 1400 1600 1800 2000 TOTAL DEFLECTION 9" 10" 11" 12 | ||