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 three tests on a cadmium plated and lubricated front road spring.
| Identifier | ExFiles\Box 52\2\ Scan185 | |
| Date | 14th March 1928 | |
| K. {Mr Kilner} FRONT ROAD SPRING - STANDARD - F. {Mr Friese} 71975 - 1100 LB CADIUM PLATED - LUBRICATED. DEFLECTION - INS. APPLIED LOAD - LB. HYSTERISIS LBS. TEST N° 3 TEST N° 2 TEST N° 1 | ||