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 output speed curves showing the effect of series winding excited by headlamp current.
| Identifier | ExFiles\Box 61b\1\ scan0237 | |
| Date | 1st September 1931 | |
| 40/50 AMPERE OUTPUT AT CONSTANT OPERATING VOLTAGE OF 14.0 DYNAMO R.P.M PII CHASSIS M.P.H. WITH 11/41 AXLE & 33.0" TYRE DIA. OUTPUT SPEED CURVES SHOWING EFFECT OF SERIES WINDING EXICITED BY HEAD LAMP CURRENT. 1 WITHOUT SERIES WINDING. 2 WITH SERIES WINDING SUPPLIED THROUGH 36 WATT LAMPS. 3 " " " " " 60 " " DOTTED CURVE SHOWS OUTPUT OF STD MACHINE UNDER CONDITIONS SIMILAR TO THOSE OF CURVE 3. C.A.P 1-9-31 | ||