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).
The condition of six exhaust valves removed from a chassis after completing 26,366 miles.
| Identifier | ExFiles\Box 97\5\ scan0158 | |
| Date | 17th April 1939 | |
| 400b. To Rm.{William Robotham - Chief Engineer} from HPS{Horace Percy Smith - Experimental Factory Mgr}/RH.{R. Hollingworth} c. De. c. By.{R.W. Bailey - Chief Engineer} c. Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} c. HPS.{Horace Percy Smith - Experimental Factory Mgr} HPS{Horace Percy Smith - Experimental Factory Mgr}/RH.{R. Hollingworth}1/BA.17.4.39. B.V.No.7 Unit - Chassis 8.B.V. We attach hereto for reference photograph of six Exhaust Valves EW.1853, manufactured in KE.965, removed from the above unit in France after completing 26,366 miles. On Nos. 2 and 3 small cracks are apparent under the head, Nos. 6,7, and 10 are free from cracks, No.11 the head has completely broken away from the stem. HPS{Horace Percy Smith - Experimental Factory Mgr}/RH.{R. Hollingworth} | ||