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).
Wiring diagram for the master control switch and associated components.
| Identifier | ExFiles\Box 168b\2\ img240 | |
| Date | 11th February 1932 guessed | |
| POSITIVE SUPPLY FROM IGNITION SWITCH MASTER CONTROL SWITCH CONTACTS OPERATED EITHER BY CUT-OUT OR OIL PRESSURE FUSE WARNING LAMP IGNITION FUSES. TO JUNCTION BOXES | ||