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).
Conclusion of a letter discussing the design limitations of a wooden screw.
| Identifier | ExFiles\Box 75\3\ scan0141 | |
| Date | 19th November 1924 guessed | |
| Contd. -3- I regret that I cannot make any more definite recommendations. I could design a wooden screw which would within limits tend to increase its efficiency as the belt slipped but I should not care to make it such as to twist under load. Yours faithfully, (sgd) H.C. Watts. | ||