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 a generator and battery circuit featuring a changeover switch.
| Identifier | ExFiles\Box 163\7\ img305 | |
| Date | 5th December 1936 guessed | |
| GENERATOR VOLTMETER AMMETER G+ CHANGEOVER SWITCH B- IGN. B+ LOAD RESISTANCE AMMETER SWITCH 12 V.{VIENNA} BATTERY | ||