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 plotting dynamo RPM against Amperes output, showing cold and warm curves.
| Identifier | ExFiles\Box 168a\3\ img485 | |
| Date | 19th May 1930 | |
| 5 D.R. DYNAMO 12 VOLT 15 AMP WARM READINGS TAKEN AFTER 1 HOURS RUN AMPERES 0 5 10 15 R.P.M. 1000 2000 3000 680 650 19.5.1930. AMPERES COLD AMPERES WARM | ||