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 cross-section of a circular mechanical part with dimensional annotations.
| Identifier | ExFiles\Box 170\1\ img007 | |
| Date | 14th January 1938 guessed | |
| 7.9" P.C.D, +.575, -.560, 1.25" DIA., .75", .45", 2.15", 1.4 R, 12.75" DIA | ||