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).
Comparison of four different designs for a journal and flywheel flange.
| Identifier | WestWitteringFiles\V\October1930-February1931\ Scan248 | |
| Date | 27th January 1931 guessed | |
| ① PRESENT CHINA JOURNAL 2.125" 2.25 2.5 1.0" ② 2.3 ③ 2.25 2.3 12 5/16" BOLTS FLYWHEEL FLANGE ④ 2.3 10 5/16" STUD OR SET SCREWS | ||