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).
Requesting a patent for a raised crown piston design.
| Identifier | ExFiles\Box 147\3\ scan0180 | |
| Date | 28th November 1938 | |
| 1247 By/NW.{N. Walker - Patents} from Rm.{William Robotham - Chief Engineer} Rm{William Robotham - Chief Engineer}3/R.28.11.38. Herewith an explanation of what we believe to be the reason for the effectiveness of the raised crown piston on the existing cylinder head. Will you please endeavour to get a patent for this in my name. Rm.{William Robotham - Chief Engineer} | ||