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).
Blueprint of a modified air valve for a 25 HP engine with handwritten annotations.
| Identifier | ExFiles\Box 102\1\ scan0209 | |
| Date | 4th December 1933 | |
| Hs{Lord Ernest Hives - Chair}1224 VALVE TO BE MACHINED CONCENTRIC WITH GUIDES AFTER SLEEVE HAS BEEN SHRUNK IN. GUIDE PORTIONS TO HAVE .0005 - .001 DIAMETRICAL CLEARANCE THIS MEASUREMENT TO BE THE SAME AS STANDARD AEROT E55795 STANDARD CHAMBER .005 DIAMETRICAL CLEARANCE BETWEEN AIR VALVE AND THE SUCTION CHAMBER STAINLESS STEEL SLEEVE SHRUNK INTO ALUM VALVE SLEEVE TO BE AS LIGHT AS POSSIBLE SLEEVE AND PIVOT PIN SUPPORT IN ONE PIECE MODIFIED AIR VALVE (STD 25 HP CACC) OTHER DETAILS SEE (E55795) ROLLS-ROYCE, LTD. PRINT ROOM DEC 4 1933 DERBY | ||