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).
Blueprint diagram illustrating the torsion axis of a body bottom-side component.
| Identifier | ExFiles\Box 111\1\ scan0098 | |
| Date | 1st June 1938 guessed | |
| Torsion Axis. BODY BOTTOM-SIDE - I-B-5. | ||