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 material specifications for B.3 and B.50 frames, comparing suppliers and production methods.
| Identifier | ExFiles\Box 113\5\ scan0070 | |
| Date | 26th August 1938 | |
| 1010. To Rm.{William Robotham - Chief Engineer} ROY{Sir Henry Royce}/Les.6/B. 26.8.38. The material specification for the B.3 and B.50 Frames acquired from John Thompsons is as follows :- Carbon .20 - .25 Sulphur .038 Phosphorous .04 Manganese .5 The material proposed by Sankeys for the Frame was - Carbon .15 - .20. As Briggs and other pressing firms consider the strength of frames produced with the proper tools considerably greater than the Hand-smithed frames, it appears that the lower percentage of Carbon should be satisfactory. ROY{Sir Henry Royce}/Les.{Ivan A. Leslie} | ||