The Brinell hardness test results for a chassis spring.
| Identifier | ExFiles\Box 80\2\ scan0300 | |
| Date | 28th June 1920 guessed | |
| CHASSIS SPRINGS. BRINELL TESTS - CONTD. Spring 363 Z. C2. 2216 lbs. Leaves. | Brin: | Remarks. | Hrs. run. 1 | 388 | Cracked 2 | 388 | Broken. 3 | 415/388 | " 4 | 401 | O.K. 5 | 352 | O.K. 6 | 388 | O.K. The value '9 hrs. 15 mins.' is noted in the 'Hrs. run.' column, spanning multiple rows. | ||
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).