Cost comparison for Synchromesh Cones made from Duralumin versus Phosphor Bronze.
| Identifier | ExFiles\Box 148\5\ scan0201 | |
| Date | 13th September 1937 | |
| To Rm {William Robotham - Chief Engineer} /GRY. {Shadwell Grylls} from G {Mr Griffiths - Chief Accountant / Mr Gnapp} /Rb {R. Bowen} 1260 G {Mr Griffiths - Chief Accountant / Mr Gnapp} /Rb. {R. Bowen} 4/K/72/R.13.9.37. Synchromesh Cones. Phantom III, 25/30 HP., & Bentley - SEC.6040/50 Rm {William Robotham - Chief Engineer} /GRY {Shadwell Grylls} 4/R.8937. It is not considered there would be any appreciable difference in cost by using Duralumin in place of Phosphor Bronze for the production of Synchromesh Cones. G {Mr Griffiths - Chief Accountant / Mr Gnapp} /Rb {R. Bowen} Ruck | ||
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).