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).
Confirmation memo regarding gearbox modifications, including material changes and component hardening.
| Identifier | ExFiles\Box 82\2\ scan0047 | |
| Date | 3rd May 1934 | |
| X45539 RHC.{R. H. Coverley - Production Engineer} Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls}29/KW.3.5.34. Gearbox for 4-B-IV 10,000 Miles. This is to confirm our asking you to make the gearbox casting and clutch pit in magnesium if the castings are ready in time. We should also like the thrust surface of the 1st speed wheel to be hardened, as discussed with you. Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls} | ||