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).
Instruction regarding the hardening of surfaces for components within the Spectre and Wraith gearboxes.
| Identifier | ExFiles\Box 94\1\ scan0096 | |
| Date | 20th February 1935 | |
| SECRET. +328 By.{R.W. Bailey - Chief Engineer} from HDY.{William Hardy} HDY.{William Hardy}2/HP.20.2.35. c. BHC. E.{Mr Elliott - Chief Engineer} Hs.{Lord Ernest Hives - Chair} SpectreCodename for Phantom III and Wraith Gearboxes. Will you kindly instruct hardened surfaces for the rear face of the 1st speed pinion, the front face of the adjacent retaining plate where in contact with the pinion and the face of this plate where in contact with the spring ring. HDY.{William Hardy} | ||