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).
Diagram of a semi-earthed electrical system.
| Identifier | ExFiles\Box 61\2\ scan0203 | |
| Date | 5th December 1922 | |
| [ "DIAGRAM OF SEMI-EARTHED ELECTRICAL SYSTEM", "A.{Mr Adams}", "DISTRNG FUSES.", "CHARGING SWITCH", "FIELD FUSE", "DYNAMO", "F", "+", "-", "INSP LAMP PLUG SOCKET", "INSTR LAMP", "CUT-OUT", "Sh", "Se", "STARTER MOTOR", "EARTHING OR EMERGENCY NEGATIVE FUSE", "STARTER MOTOR RELAY CIRCUIT", "IGNITION", "LAMPS", "LAMPS", "HORN", "BODY LIGHTS.", "E.F.C.", "5.12.22." ], | ||