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 for Spring F.363, detailing results of timed endurance testing on its six leaves.
| Identifier | ExFiles\Box 80\2\ scan0310 | |
| Date | 28th July 1920 | |
| R.F.C. X.3981 X.3981 X 1331 SPRING F.363 - 2212 lbs. parallel - tapered ends no nibs and slots - ground all over. Fitted on O.S. bump chassis 28.7.20. | No. of leaves 6. | Brinell. | Remarks. | Time run. | |------------------|----------|----------------------------|------------------| | 1 | 415 | cracked 1 1/4" rear of clip. | 20 hrs. 45 mins. | | 2 | 444 | cracked 1 1/4" rear of clip | | | 3 | 415 | broken under front clip. | 22 hrs. 25 mins. | | 4 | 415 | cracked " " " | | | 5 | 415 | " " " " | | | 6 | 415 | O.K. | | Spring taken off 2.8.20. R.{Sir Henry Royce} R.{Sir Henry Royce} 285A (100 T) (S. G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 843, 19-2-20) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2618 | ||