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).
Sketches comparing four different designs for a journal and flywheel flange.
| Identifier | ExFiles\Box 137\4\ scan0183 | |
| Date | 27th January 1931 guessed | |
| ① PRESENT CHINA JOURNAL 2.125 2.25 2.6 1.0" ② 2.5 ③ 12 - 5/16" BOLTS FLYWHEEL FLANGE 2.25 2.3 ④ 10 5/16" STUDS OR SET SCREWS 2.3 | ||