Blueprint showing geometric layouts and circular patterns.
| Identifier | ExFiles\Box 170\1\ img013 | |
| Date | 3rd November 1938 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).