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 illustrating a suggested non-earthed electrical circuit.
| Identifier | Morton\M2.3\ img007 | |
| Date | 18th May 1930 | |
| Various circuits Non-earthed Lights. Suggested Smith switch-box and Ammeter. Junction Box. Smith cut-out .Battery. Smith Dynamo. Motor R.R. 5327 (100 L) (2' G' 942' 18-5-30) c 2818 | ||