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).
Material change for Bentley valve springs to carbon wire.
| Identifier | ExFiles\Box 88\4\ scan0216 | |
| Date | 4th February 1938 | |
| 254 By.{R.W. Bailey - Chief Engineer} from Rm.{William Robotham - Chief Engineer} c. Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} c. By/Mr. Bower. Rm{William Robotham - Chief Engineer}13/R.4.2.38. BENTLEY VALVE SPRINGS. With reference to By23/G.27.1.38., we suggest that any new valve springs are made from carbon wire, and are not made in chrome vanadium until carbon wire has proved unsatisfactory. Rm.{William Robotham - Chief Engineer} | ||