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).
Production of bottom tappets for the Wraith, referencing Chevrolet and Vauxhall designs.
| Identifier | ExFiles\Box 126\4\ scan0179 | |
| Date | 16th June 1937 | |
| 105`6 SECRET. HPS.{Horace Percy Smith - Experimental Factory Mgr} from Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}6/R.16.6.37. Regarding the bottom tappets of Chevrolet type which you are producing in Cast Iron, we attach drawings of the Vauxhall bottom tappets which we should like you to copy when machining, with regard to the face and the section at the base. An Ex drawing to be made of these with modified dimensions to suit our own length and diameter for Wraith. 2 such sets of bottom tappets to be ordered from Smith Bros., Wolverhampton, specifying the material to be the same as the ones they supply to Vauxhall for their 25 H.P. chassis. Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} | ||