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).
Specifications and test results for a 3 B.HP D.C. Plant Motor and its regulating resistances.
| Identifier | ExFiles\Box 61\2\ scan0040 | |
| Date | 9th November 1928 | |
| X75 Crypto 9.11.28. 3 B.H.P. D.C. PLANT MOTOR AND REGULATING RESISTANCES. Voltage 100/110 Amperes 27 Speed 1500 } Given on plate. Observations running light :- Normal speed on 114 volts = 1640 Speed reduced by armature series resistance supplied = 1570 Speed increased by field series resistance supplied = 2850 Resistance of armature circuit at 20° C = .5 ohm. Resistance of field circuit at 20°C = 64 ohms. Resistance of armature series rheostat = 2.2 ohms. Resistance of field series rheostat = 250 ohms. | ||