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).
Recommendation regarding the replacement of mild steel differential boxes on Phantom III cars.
| Identifier | ExFiles\Box 92\5\ scan0132 | |
| Date | 10th June 1937 | |
| Sg.{Arthur F. Sidgreaves - MD} from Rm{William Robotham - Chief Engineer}/Gry.{Shadwell Grylls} Hs.{Lord Ernest Hives - Chair} c. to E.{Mr Elliott - Chief Engineer} c. to By.{R.W. Bailey - Chief Engineer} c. to Hd.{Mr Hayward/Mr Huddy} c. to Br.{T. E. Bellringer - Repair Manager} 302 Rm{William Robotham - Chief Engineer}/Gry.{Shadwell Grylls}6/AP.10.6.37 P.III. REAR AXLE. Sometime ago it was decided to change all mild steel differential boxes on P.III. cars owing to - (1) Failure on a 20/25. of a wrongly machined part. (2) A cracked part found in the Shop but of unknown history. Out of the 58 cars to be changed 22 still have to be done. In view of the fact that a cracked part has not been discovered on a customer's car and a mild steel one has run 57 hours on dynamometer on 2nd. gear, we recommend that the remaining 22 cars should not be changed. Rm{William Robotham - Chief Engineer}/Gry.{Shadwell Grylls} | ||