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).
Blueprint of a mechanical component cross-section with dimensional and force annotations.
| Identifier | ExFiles\Box 179\2\ img002 | |
| Date | 1st December 1931 guessed | |
| 1/2 lb, 2", 4", 1/2 lb | ||