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).
Test report on a 9-leaf spring detailing failures after a 42.5-hour run.
| Identifier | ExFiles\Box 119\2\ scan0123 | |
| Date | 19th August 1920 | |
| X.1331. SPRING F.391 - parallel leaves, without tie clips no nibs and slots, ground all over, consisting of 9 leaves. Fitted to N.S. Bump chassis 10.8.20. (2286 lbs.) X.3981. X.1331 No. of leaves 9. Brinell. Remarks. Time run. 1 444 Small cracked ## under front clip. 2 415 Broken under rear clip and cracked under front clip 3 415 Cracked under front clip and rear of clip. 4 444 Cracked under front clip. 5 444 Cracked front of front clip. 6 416 O.K. 7 444 O.K. 8 444 Cracked under front clip. 9 444 O.K. 42 hrs. 30 mins. Spring taken off 19.8.20. | ||