Blueprint graph with data plotted on a grid.
| Identifier | Morton\M7\ img074 | |
| Date | 1st May 1928 | |
| 2250 2500 2750 3000 12 LIMITED D. {John DeLooze - Company Secretary} ROOM. 1 MAY. 28 | ||
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).