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).
Line and scatter plot graph comparing 'Ideal' and 'Actual' results, with a condition noted as 'Passage Blocked'.
| Identifier | ExFiles\Box 102\1\ scan0112 | |
| Date | 13th February 1933 guessed | |
| 8 7 6 5 500 1000 1500 2000 2500 3000 3250 IDEAL ACTUAL PASSAGE BLOCKED | ||