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).
Graph of current versus speed for a Lucas Dynamo Lighting Set with a 12-volt battery.
| Identifier | ExFiles\Box 36\4\ scan 260 | |
| Date | 4th March 1924 guessed | |
| LUCAS DYNAMO LIGHTING SET. OPERATING WITH LUCAS 12 VOLT BATTERY. CURRENT (AMPERES) MAIN AND CONTROL (FIELD) SPEED (R.P.M) MAIN CURRENT TO BATTERY NO LIGHTS ON. CONTROL CURRENT FIELD CURRENT B. | ||