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).
Four comparative cross-sectional sketches of a journal and flywheel flange with annotations.
| Identifier | ExFiles\Box 103\3\ scan0037 | |
| Date | 27th January 1931 guessed | |
| ① ② ③ ④ PRESENT CHINA JOURNAL 2.125" 2.25 2.6 1.0" 2.5 12 5/16" BOLTS FLYWHEEL FLANGE 2.3 10 5/16" STUDS OR SET SCREWS. | ||