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 coefficient of friction against temperature for BZ lining in an R.R. drum.
| Identifier | ExFiles\Box 98\3\ scan0074 | |
| Date | 23th January 1939 guessed | |
| CO-EFFICIENT OF FRICTION .4 .3 .2 .1 BZ LINING - R.R. DRUM TEMPERATURE - °C 0 0° 100° 200°C | ||