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).
Brinell hardness tests conducted on various chassis springs.
| Identifier | ExFiles\Box 119\2\ scan0113 | |
| Date | 23th June 1920 guessed | |
| CHASSIS SPRINGS. BRINELL TESTS. Spring F.7789 2000 lbs. Leaves. Brin: Remarks. Hrs. run. 1 388 Cracked. 2 375 O.K. 3 363 Broken 14 hrs. 35mins. 4 401 O.K. 5 363 Broken 6 415 O.K Spring Y.363 1990 lbs. Leaves. Brin: Remarks. Hrs. run. 1 401 O.K. 2 388 O.K. 3 401 O.K. 17 hrs. 15 mins. 4 388 Cracked 5 388 O.K. 6 375 O.K. Spring F.7790 2100 lbs. 1 401 Broken 2 363 Cracked 3 388 O.K. 14 hrs. 35 mins. 4 401 Cracked 5 401 " 6 388 O.K. Spring Z.363 2120 lbs. 1 415 O.K. 2 388 Cracked 3 401 O.K. 17 hrs. 15 mins. 4 401 Broken 5 388 " 6 388 O.K. Spring F.7787 1900 lbs. 1 429/415 Broken 2 352 Cracked 3 388 " 21hrs. 15 mins. 4 388 " 5 388 O.K. 6 388 O.K. Spring F.7788 (tapered ends) 2000 lbs. 1 401 O.K. 2 388 O.K. 3 401 O.K. 21 hrs. 15 mins. 4 401 O.K. 5 388 O.K. 6 388 O.K. Contd. | ||