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).
Test results and specifications for a Dynamo P.T.1.
| Identifier | ExFiles\Box 76\2\ scan0103 | |
| Date | 1st March 1930 | |
| X.632 1.3.30. DYNAMO P.T.1. Field Particulars. Volts 21.4 Amperes .77 Watts 16.48 Ohms 27.8 Running light (neg. rotation). R.P.M. 745. Volts 19.4 Amperes 4.05 Positive rotation. R.P.M. 700. Volts 19.4 Amperes 3.95 GJ. | ||