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 bending moment and stress on a wood screw joint.
| Identifier | ExFiles\Box 71\1\ scan0225 | |
| Date | 24th June 1926 guessed | |
| THERE IS A LARGE BENDING MOMENT ON THE WEAK ROOT OF THE THREAD OF THIS WOOD-SCREW, WHILST THE SCREW IS TRYING TO SPLIT THE WOOD. FIG 5. | ||