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).
Front buffer spring test report, detailing Brinell hardness and run time.
| Identifier | ExFiles\Box 80\2\ scan0200 | |
| Date | 22th September 1920 | |
| X.1331 / X.2628 BUFFER TEST - FRONT. Spring F.4629 - 900 lbs. 10 leaves with nibs and slots Tie clips, tapered ends. (standard springs) Fitted to N.S. bump chassis 30.8.20 No. of leaves. | Brinell. | Remarks. | Time run. 1 | 461 | Broken 6" from front end. 2 | 388 | O.K. 3 | 388 | O.K. 4 | 415 | O.K. 5 | 415 | O.K. 6 | 444 | O.K. 7 | 444 | O.K. 8 | 401 | O.K. 9 | 444 | O.K. 10 | 444 | O.K. Time run: 20 hrs. 50 mins. Spring Taken off 22.9.20 R.R. 238A (100 T)(S.H. 159. 11-8-20) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2800 | ||