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).
Set of six numbered indicator diagrams or performance plots.
| Identifier | ExFiles\Box 152\1\ scan0113 | |
| Date | 10th February 1933 guessed | |
| S.C 451 452 10 453 15 454 20 455 6.C 456 | ||