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).
Circuit diagram illustrating a battery ignition system with a dynamo and distributor.
| Identifier | ExFiles\Box 147\2\ scan0286 | |
| Date | 12th January 1940 guessed | |
| a, d, d2, c, e1, e2, e5, e4, e3 | ||