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).
Diagram illustrating the third method for the torsional rigidity test of a frame.
| Identifier | ExFiles\Box 170\2\ img284 | |
| Date | 4th May 1925 | |
| I DASH FR WL PLANE Torsional Rigidity Test of Frame Third Method HIL-TON- 4/5/25 | ||