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).
Performance graph comparing the specified and actual output of a 20 HP dynamo.
| Identifier | ExFiles\Box 165\6\ img014 | |
| Date | 1st February 1926 | |
| AMPERE OUTPUT APPROX OPERATING VOLTAGE OUTPUT OF 20 HP R.R. DYNAMO PRESENT M.7° ON PRODUCTION C.120° Specified Output Temp = 80°C CURVE TAKEN ON ACTUAL CHASSIS CIRCUIT CHASSIS M.P.H. 11/50 AXLE. 31.4" DIA. TYRES. DYNAMO R.P.M 20 H.P. F.J.A. 1-2-26 | ||