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).
Hardening instructions for the 1st speed retaining plate on Spectre and Wraith gearboxes.
| Identifier | ExFiles\Box 94\1\ scan0097 | |
| Date | 21th February 1935 | |
| 4328 To-BY.{R.W. Bailey - Chief Engineer} from HDY.{William Hardy} SECRET. HDY.{William Hardy}1/HP.21.2.35. c..RHC.{R. H. Coverley - Production Engineer} Hy.{Tom Haldenby - Plant Engineer} Hs.{Lord Ernest Hives - Chair} SpectreCodename for Phantom III and Wraith Gearboxes. Further to Hdy.{William Hardy}2/HP.20.2.35, will you also kindly instruct hardening for the bore of the 1st speed retaining plate where contact is made with the shaft. HDY.{William Hardy} | ||