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 nine-leaf parallel spring, detailing Brinell hardness and damage after a time run.
| Identifier | ExFiles\Box 119\2\ scan0124 | |
| Date | 18th August 1920 | |
| X.1531 X.3981 SPRING F.391 - 2324 lbs. - parallel leaves without tie clips, no nibs or slots - ground all over, consisting of nine leaves. Fitted to Bump Chassis 10.8.20. (O.S.) X.3981 No. of leaves 9. | Brinell. | Remarks. | Time run. --- | --- | --- | --- 1 | 444 | Small crack under rear clip. | 39 hrs. 50 mins. 2 | 461 | cracked front of front clip. | 3 | 444 | O.K. | 4 | 461 | cracked under rear clip. | 5 | 461 | cracked front of front clip. | 6 | 420 | " " " " " Broken 8" from rear end of leaf | 7 | 444 | " " " " " | 8 | 444 | cracked under rear clip. | 9 | 444 | O.K. | Taken off 18.8.20. R.R. 235a. (100 T) S. G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 643. 19-2-20) G 2618 Watermark: DICKINSON MADE IN | ||