Instruction regarding hardened and unhardened surfaces for the Wraith II gearbox splines and shafts.
| Identifier | ExFiles\Box 8\11\ 11-page037 | |
| Date | 8th August 1936 | |
| Handwritten: 4044, 628, Rm {William Robotham - Chief Engineer} Typed: O.C. to Mr. RHC. {R. H. Coverley - Production Engineer} Hs {Lord Ernest Hives - Chair} /Rm. {William Robotham - Chief Engineer} Derby E {Mr Elliott - Chief Engineer} /HDY. {William Hardy} 3/HP.8.8.36. Wraith II - Gearbox. With reference to the splines on the shafts and in the gears and synchromesh pieces, will you kindly instruct hardened surfaces for the former and unhardened surfaces for the latter. The servo drive shaft is an exception as this need not have hardened surfaces. E {Mr Elliott - Chief Engineer} /HDY. {William Hardy} | ||
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).