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).
Copy document from Hepworth & Grandage detailing the chemical composition of suggested ring materials for testing.
| Identifier | ExFiles\Box 148\3\ scan0245 | |
| Date | 30th April 1937 | |
| C O P Y. HEPWORTH & GRANDAGE 1256 30.4.37. CHEMICAL COMPOSITION OF SUGGESTED RING MATERIAL FOR TEST. High Phosphorus Molybdenum Single Rings. Total Carbon. 3.5/3.8% Combined " .50/.7 Solicon. 2.60/2.9 Sulphur .07 Phosphorus .50/.70 Manganese. .55/.70 Chromium. .20/.25 Molybdenum .25/.35 A Ordinary Single Rings. Total Carbon. 3.5/3.8% Combined " .50/.70 Silicon. 2.60/2.9 Sulphur .07 max. Phosphorus. .40/.55 Manganese. .55/.70. B | ||