Recommending specific viscosity 50 oils for the Phantom III 'D' series gearbox.
| Identifier | ExFiles\Box 145\3\ scan0184 | |
| Date | 24th May 1938 | |
| γ 1235 To NW. {N. Walker - Patents} from Rm {William Robotham - Chief Engineer} /Gry. {Shadwell Grylls} c. By. {R.W. Bailey - Chief Engineer} Rm {William Robotham - Chief Engineer} /Gry. {Shadwell Grylls} 2/MH. {M. Huckerby} 24.5.38. P.III 'D' SERIES OILS. With regard to NW. {N. Walker - Patents} 13/VL. {V. Lewis / Mr Valentine} 9.5.38, we recommend this should be the same as Bentley 'M' series except that the gearbox should run on - Castrol XXL or Vacuum BB or Price's C or Shell Triple. these all being viscosity 50 oils. Rm {William Robotham - Chief Engineer} /Gry. {Shadwell Grylls} | ||
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).