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 plotting the co-efficient of friction against temperature for B.Z. lining in an R.R. drum.
| Identifier | ExFiles\Box 98\3\ scan0075 | |
| Date | 3rd February 1939 guessed | |
| CO-EFFICIENT OF FRICTION ∙4 ∙3 ∙2 ∙1 0 0° 100° 200°C TEMPERATURE - °C B.Z. LINING - R.R. DRUM. | ||