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 diagram of an Electrical Indicator Valve.
| Identifier | ExFiles\Box 165\4\ img147 | |
| Date | 18th February 1932 | |
| ELECTRICAL INDICATOR VALVE, CONNECTION TO AIR BOTTLE, TERMINAL, INSULATOR, DISC VALVE, STD. PLUG THREAD. 18 m/m, AUXILIARY ESCAPE VALVE, TO BLOW OUT OILY GASES,, PRIOR TO OPENING DISC VALVE., ROLLS-ROYCE, LTD, PRINT ROOM, MAR 9 1932, DERBY, 18-2-32 | ||