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).
Experimental trial of Phantom valves, springs, and hydraulic silent tappets.
| Identifier | ExFiles\Box 17\6\ Scan236 | |
| Date | 13th June 1934 | |
| X7060 To EY. from E/JNR.{Charles L. Jenner} E/JNR.{Charles L. Jenner}3/HP.13.6.34. c. Hs.{Lord Ernest Hives - Chair} RHC.{R. H. Coverley - Production Engineer} re Phantom Valves and Springs. Ref. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}5/KW.4.6.34. We send you herewith:- LeC.3960 showing double valve springs and the lightened exhaust valve which are to be tried experimentally in conjunction with the hydraulic silent tappets. The safety retaining rings are fitted to the valve stems. The drawing also shows these rings arranged for the standard valve springs and washers. E/JNR.{Charles L. Jenner} | ||