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 showing the variation of ampere output against lever position for different dynamo models at various speeds.
| Identifier | ExFiles\Box 36\4\ scan 113 | |
| Date | 9th August 1920 guessed | |
| X 3014 X 595. Ampere output Smith 2D2 hot at 1200 R.P.M. Lucas E.S. 3/5 hot at 1450 R.P.M. Lucas A400 at 965 R.P.M. Variation of output with lever pos'n (Control brush or lever on Lucas's dynamo) Distance from full retard | ||