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).
Laboratory analysis of the chemical composition and hardness of an American spring.
| Identifier | ExFiles\Box 43\2\ Scan040 | |
| Date | 7th September 1921 | |
| Hs.{Lord Ernest Hives - Chair} Laboratory. H12/GLT/7.9.21. Re. Very good American Spring No. 2. Analysis:- Carbon. 0.44% Manganese. 0.72% Nickel. Nil. Chromium. Nil. Silicon. 1.83% Sulphur. 0.030% Phosphorus. 0.018% The brinell varies between 385 and 415. C O P Y. H1. R.R. 236A (100 T) (S.H. 798 10-12-20) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2948 | ||