Blueprint graph showing multiple data plots on a grid.
| Identifier | Morton\M4.2\ img024 | |
| Date | 1st January 1923 guessed | |
| ", | ||
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).