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).
Series of six hand-drawn graphs on blue grid paper plotting data at various temperatures.
| Identifier | ExFiles\Box 39\3\ Scan269 | |
| Date | 20th September 1926 guessed | |
| 30°C 60°C 80°C 100°C 10 15 20 25 30 | ||