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).
Graphs showing the results of three tests on a cadmium-plated front spring after a 4000-mile road test.
| Identifier | ExFiles\Box 52\2\ Scan186 | |
| Date | 12th September 1928 | |
| L 12-9-28 FRONT SPRING TESTS - 12 EX. - CADMIUM PLATED F.78164 - 1050 LB. - AFTER ROAD TEST - 4000 MILES -DRY- THIS SPRING WAS PURPOSELY NOT LUBRICATED DURING ONE TEST. DEFLECTION - INS APPLIED LOAD - LB - HYSTERESIS LBS TEST No 3 TEST No 2 TEST No 1 | ||