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).
Reference note regarding the steering gear for the Wraith II and Wraith 80 B.V models.
| Identifier | ExFiles\Box 9\7\ 07-page188 | |
| Date | 8th May 1939 | |
| 650. Rm.{William Robotham - Chief Engineer} Da.{Bernard Day - Chassis Design} 6/9 8.5.39 Wraith II Wraith 80 B.V B.50. - Steering Gear. see file 1300 - | ||