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).
Test results detailing the permanent set of Wraith side steering tube springs.
| Identifier | ExFiles\Box 9\7\ 07-page176 | |
| Date | 16th July 1938 | |
| 650 To By.{R.W. Bailey - Chief Engineer} from Rm{William Robotham - Chief Engineer}/FJH.{Fred J. Hardy - Chief Dev. Engineer} Rm{William Robotham - Chief Engineer}/FJH.{Fred J. Hardy - Chief Dev. Engineer}7/MH.{M. Huckerby}16.7.38. WRAITH SIDE STEERING TUBE SPRINGS. We have tested the six springs made by the Tempered Spring Co. by loading them to choc position 10 times and then clamping them to this position for 3 days. They have taken a permanent set as follows:- 0.003, 0.005, 0.005, 0.006, 0.009, 0.016. Rm{William Robotham - Chief Engineer}/FJH.{Fred J. Hardy - Chief Dev. Engineer} | ||