Continuation of Brinell hardness test results for various spring leaves under different loads.
| Identifier | ExFiles\Box 80\2\ scan0297 | |
| Date | 19th July 1917 | |
| BRINELL TESTS - CONTD. Spring F.7787. 1900 lbs. Leaves. | Brin: | Remarks. | Hrs. run. 1 | 429/415 | Broken | 2 | 352 | Cracked | 3 | 388 | Cracked | 21 hrs.15 mins. 4 | 388 | Cracked | 5 | 388 | O.K. | 6 | 388 | O.K. | Spring F.7788 (tapered end) 2000 lbs. Leaves. | Brin: | Remarks. | Hrs. run 1 | 401 | O.K. | 2 | 388 | O.K. | 3 | 401 | O.K. | 21 hrs.15m 4 | 401 | O.K. | 5 | 388 | O.K. | 6 | 388 | O.K. | Spring 363.Z. C2. 2216 lbs. Leaves. | Brin: | Remarks. | Hrs. run. 1 | 388 | Cracked | 2 | 388 | Broken | 3 | 415/388 | Broken | 9 hrs. 15 mins. 4 | 401 | O.K. | 5 | 352 | O.K. | 6 | 388 | O.K. | Footer text: R.R. 399 (250I) (SD676 19-7-17) MP180865 | ||
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).