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).
Instructing the replacement of .170 raised crown pistons with .300 raised crown pistons.
| Identifier | ExFiles\Box 97\5\ scan0332 | |
| Date | 4th January 1939 | |
| 8 400a To 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}3/MH.{M. Huckerby}4.1.39. 7.B.V. Will you please remove the .170 raised crown pistons and fit the .300 raised crown pistons ex B.V. No.1 unit. Do not remove any of the carbon from the pistons or the head. Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} | ||