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).
Analysis and comparison of a hard-rolled Carbon Steel sample, with a conclusion on its suitability.
| Identifier | ExFiles\Box 129\1\ scan0294 | |
| Date | 30th September 1937 | |
| NRC{N. R. Chandler} file 1110 Sample of steel submitted is Hard rolled Carbon Steel giving a Brinell Hardness of 412. Spring submitted for comparison is 517 Brinell. Suggest the material offered is plenty hard enough for its purpose & would function satisfactorily. RH{R. Hollingworth}/EH 30/9/37 | ||