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 an earthed or non-earthed electrical system.
| Identifier | Morton\M2.3\ img010 | |
| Date | 19th February 1920 | |
| 4 Earthed or non-earthed R.R. switch-box and Ammeter. New distribution board. Lights. Smith cut-out Smith Dynamo. Various circuits. Battery. Motor. R.R. 235A (100 T) (S. G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 643, 19-2-20) G 2618 | ||