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).
Measurement and testing of six exhaust valves found to be within drawing limits.
| Identifier | ExFiles\Box 108\3\ scan0148 | |
| Date | 14th March 1938 | |
| To Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} from HPS.{Horace Percy Smith - Experimental Factory Mgr} [Handwritten annotation top left]: Rm{William Robotham - Chief Engineer} [Handwritten annotation top right]: v Files [Handwritten annotation in red]: 600a 26.G.VI. EXHAUST VALVES. Referring to your recent memo in connection with the above. We have measured the six exhaust valves in question and find that all are within the drawing limits; it would therefore appear that the loss of clearance is due to pocketting. These valves have also been crack tested and proved satisfactory. [Large handwritten signature over text] HPS.{Horace Percy Smith - Experimental Factory Mgr} [Handwritten signature] | ||