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).
Graph showing the coefficient of friction versus temperature for 0.3% Carbon Steel.
| Identifier | ExFiles\Box 85\1\ scan0015 | |
| Date | 14th January 1936 guessed | |
| COEFFICIENT OF FRICTION 0.5 0.4 0.3 0.2 0.1 0 Disc S3 0.3% CARBON STEEL. 100°C. - 200°C. 100°C. - 260°C. 100°C. - 300°C. TEMPERATURE DEG. C. 100 200 300 | ||