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).
Block diagram of a non-earthed vehicle electrical system.
| Identifier | ExFiles\Box 180\M2\M2.3\ img008 | |
| Date | 12th February 1926 guessed | |
| 2 Non-earthed R.R. switch-box and Ammeter. Distribution board with Smith cut-out Lights. Dynamo Various circuits Lucas Junction Box. Battery Motor. | ||