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).
The chemical composition of a material.
| Identifier | ExFiles\Box 37\2\ scan 166 | |
| Date | 5th November 1917 guessed | |
| Chemical Composition:- Combined Carbon .35 - .60% Graphitic Max of 3.00% Silicon 1.5 - 2.2% Manganese .70 - 1.2 Sulphur .06 - .12 Phosphorus .5 - .75: HCH | ||