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).
Two hand-drawn electrical circuit diagrams for a dynamo charging system, labelled 'A' and 'B'.
| Identifier | ExFiles\Box 31\1\ Scan209 | |
| Date | 21th November 1929 guessed | |
| DIAGRAM 'A' SWITCH DYNO + - 3 1 RELAY ZENITE RES DIAGRAM "B" SWITCH DYNO + - 3 1 MAIN CUT-OUT OVERCHARGE CUT-OUT ZENITE RES | ||