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).
Information on S.A.E. special steel 3440 used in Hudson and Essex gearboxes.
| Identifier | ExFiles\Box 136\5\ scan0301 | |
| Date | 26th February 1934 | |
| X1721 X1721 To BY.{R.W. Bailey - Chief Engineer} from HDY.{William Hardy} c. Wor.{Arthur Wormald - General Works Manager} E.{Mr Elliott - Chief Engineer} Hs.{Lord Ernest Hives - Chair} HDY.{William Hardy}1/HP.26.2.34. Steel for Gearbox Gears. With reference to the remarks in Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}14/23.2.34 about the S.A.E. special steel 3440 used on the Hudson and Essex gearboxes, have you any information as to what this is and if so, do you consider that it is likely to be superior to what we use for our gears? If you have no information would you kindly enquire about it for us. HDY.{William Hardy} | ||