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 with dimensional annotations.
| Identifier | ExFiles\Box 170\1\ img002 | |
| Date | 14th January 1938 guessed | |
| I, II, III, IV, V, 31 1/8, 35 3/4, 40 3/4, 44 1/4 | ||