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).
The modification of the upper yoke bearing on the Silver Wraith Bump Chassis.
| Identifier | ExFiles\Box 119\3\ scan0208 | |
| Date | 7th July 1939 | |
| 1024+ 666. To HPS{Horace Percy Smith - Experimental Factory Mgr}/RH.{R. Hollingworth} Rm{William Robotham - Chief Engineer}/HFP.1/JH.7.7.39. Silver Wraith Bump Chassis. Will you please modify the upper yoke bearing according to drawing No.A.101 supplied by Howard Graham Ltd. th take a Harris bush in place of the 'Silentbloc' bush normally used. Rm{William Robotham - Chief Engineer}/HFP. | ||