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).
Failure report comparing the lifespan of front suspension springs from different manufacturers.
| Identifier | ExFiles\Box 95\2\ scan0035 | |
| Date | 27th February 1936 guessed | |
| Ph.III BUMPER FRONT SUSPENSION SPRING FAILURE. No.1 Chassis unit construction damper C.63356. Piece No. | Maker of spring. | Life. C.63870/1 | Firth's ground wire | 22 hrs. 45 mins. - | Firth's rolled wire | 20 hrs. 45 mins. - | Salters. | 7 hrs. - | Salters. | 41 hrs. 15 mins. No.2 Chassis Suspension to R.Sch. 4520 Piece No. | Makers of spring. | Life. C.63898/2 | Salters | 37 hrs. 25 mins - | Salters | 40 hrs. 50 mins - | Salters | 14 hrs. 25 mins - | English Steel Corp. | 100 hrs. Still intact - | English Steel Corp. | 112 hrs. Still intact | ||