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).
Hand-drawn wiring diagram for a non-earthed electrical system.
| Identifier | ExFiles\Box 180\M2\M2.3\ img009 | |
| Date | 19th February 1920 guessed | |
| 3 Non-earthed R.R. switchbox and Ammeter. Various circuits. Small new distribution board. JUNCTION X.4169 Lights. Lucas Junction Box. Smith cutout Battery Dynamo. D Motor. | ||