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).
Instructions to fit different material tappet bushes to a Wraith III No. 6 unit for a comparative wear test.
| Identifier | ExFiles\Box 10\3\ 03-page057 | |
| Date | 25th August 1937 | |
| To HPS.{Horace Percy Smith - Experimental Factory Mgr} from Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} 6->4 Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}15/AP.25.8.37 WRAITH III. No.6. UNIT. Will you please incorporate the RR.50 bottom tappet bushes as ordered in our memo Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}8/AP.24.8.37, on the above unit in the front 6 bores. (A/P) The rear six to be in the normal material as EW.859 The final bore and tappet measurement to be recorded in order to obtain data with regard to comparative wear of the two materials. Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} | ||