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 semi-earthed electrical system.
| Identifier | WestWitteringFiles\J\December1922\ Scan64 | |
| Date | 5th December 1922 | |
| DIAGRAM OF SEMI-EARTHED ELECTRICAL SYSTEM IGNITION LAMPS LAMPS HORN BODY LIGHTS ETC. DISTR NG FUSES INSP LAMP PLUG SOCKET CHARGING SWITCH DYNAMO + F - Sh/ Se. CUT-OUT STARTER MOTOR EARTHING OR EMERGENCY NEGATIVE FUSE E.F.C 5/12/22 | ||