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 Dynamo Output in Amps versus speed in M.P.H. for different electrical loads.
| Identifier | WestWitteringFiles\V\2January1931-April1931\ Scan023 | |
| Date | 22th December 1930 | |
| 18 G IV DYNAMO OUTPUT AMPS -2 -1 0 1 2 3 4 5 6 7 8 9 10 M.P.H. 0 10 20 30 40 50 60 HALF CHARGE SIDE + TAIL HEAD SIDE + TAIL HEAD SIDE TAIL FACIA LIGHTS WIND SCREEN WIPER 22-12-30 | ||