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).
Four sketches showing component cross-sections with Brinell hardness measurements and a potential casting/molding process.
| Identifier | ExFiles\Box 115\5\ scan0258 | |
| Date | 16th March 1939 guessed | |
| SKETCH I 47 BRINELL 45 BRINELL 41 BRINELL 41 BRINELL 43 BRINELL SKETCH III HOT HOT CHILLED SKETCH II SKETCH IV A B | ||