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).
The Spectre Gearbox, discussing the straight tooth first speed and the investigation into using helical teeth.
| Identifier | ExFiles\Box 94\1\ scan0004 | |
| Date | 2nd May 1934 | |
| GRY{Shadwell Grylls} x4694 328 To BT.{Capt. J. S. Burt - Engineer} from HDY.{William Hardy} HDY.{William Hardy}1/HP.2.5.34. C.C. Mr. POT. Mr. Hs.{Lord Ernest Hives - Chair} Mr. AHC. SpectreCodename for Phantom III Gearbox. Straight tooth 1st speed. We send herewith N. Sch's 4020, 4036/8/9 which give the remaining information required to complete this box. We are investigating the application of helical teeth to the 1st speed gears but are not yet in a position to say what extent the drawings sent will need modification. to HDY.{William Hardy} | ||