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).
Jumper test report for a front chassis, detailing the performance and failure of various leaf springs.
| Identifier | ExFiles\Box 80\2\ scan0243 | |
| Date | 15th October 1920 | |
| X.2628 (filed 15.10.20) X.1337 JUMPER TEST - FRONT CHASSIS. X.2628 Springs fitted. Load in lbs. Remarks. Brinell. F.4630 - 11 leaves, tie clips, nibs and slots, tapered ends. Fitted to chasis 21.9.20. (O.S.) Removed 24.9.20. 950 Top leaf broken 1" rear of clip. Ran 11 hrs. 40 mins. 1 - 418 Spring replaced with American top leaf fitted. Fitted 24.9.20. Taken off 30.9.20 2nd. and 5th. leaves broken. Ran 29 hrs. USA - 401 New spring leaves fitted with above American top leaf. Fitted 30.9.20 Taken off 1.10.20. American top leaf broken ½" behind rear clip. Ran 24 hrs. 2 - 444 3 - 4 - 5 - 477 6 - 7 - 8 - 9 - 10 - 11 - New American top leaf fitted to above spring. Fitted 1.10.20 (O.S.) R.R. 255A (100 T) (S.H 159. 11-8-20) C. 2931 | ||