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 comparing two different dynamo coil machines.
| Identifier | ExFiles\Box 62\3\ scan0235 | |
| Date | 1st December 1930 | |
| 10 20/25 AMPERE OUTPUT AT CONSTANT OPERATING VOLTAGE OF 14.0 OUTPUT SPEED CURVES 1. 56 COIL MACHINE AS AT PRESENT FITTED (65 C° SETTING) 2. 48 COIL MACHINE PROPOSED STANDARD (65 C° SETTING) DYNAMO R.P.M. CHASSIS M.P.H. 11/50 AXLE 31.4" DIA TYRES 1.12.30. | ||