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 block diagram of a non-earthed automotive electrical system, designated as the 'Present Standard'.
| Identifier | ExFiles\Box 180\M2\M2.3\ img006 | |
| Date | 19th February 1920 | |
| Non-earthed. Westn Ammeter Lucas Switch -box & cut out Lights Dynamo Present Standard Various circuits Lucas Junction Box Battery Motor R.R. 258A (100 T) (S. G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 642. 19-2-20) G 2618 | ||