Cross-sectional sketch of a bolted steel cap assembly with a handwritten note.
| Identifier | ExFiles\Box 91\3\ scan0141 | |
| Date | 28th October 1935 guessed | |
| This steel cap required | ||
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).