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).
Hand-drawn cross-section of a component with annotations.
| Identifier | ExFiles\Box 75\1\ scan0114 | |
| Date | 21th January 1920 guessed | |
| 8 .375" holes This surface reduced | ||