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 data for Lucas dynamos and cut-outs, showing voltage, amperage, and speed under hot and cold conditions.
| Identifier | ExFiles\Box 36\4\ scan 039 | |
| Date | 14th May 1920 | |
| Contd. -8- EFC1/T14.5.20. Dynamo:- Lucas E.575 No. R.1322. Cut-out:- Lucas No.14267. Condition. | Volts. | Amperes. | Speed. | Corresponding approx dynamo balancing speed and Volts. --- | --- | --- | --- | --- | | | | Speed. | Volts. Cold. 1. | 11.5 | -- | 590 | 630 | 13.0 2. | 12.4 | -1.0 | | | 3. | 12.3 | -1.7 | 570 | | 4. | 11.0 | -- | | | Hot. 1. | 16.5 | -- | 800 | 700 | 14.0 2. | 14.3 | +2.2 | | | 3. | 13.5 | -1.4 | 670 | | 4. | 12.9 | -- | | | Dynamo:- Lucas E.575 No.R.1293. Cut-out:- Lucas No.15770. Cold. 1. | 13.3 | -- | 670 | 650 | 12.55 2. | 12.7 | +.80 | | | 3. | 12.4 | -.50 | 640 | | 4. | 11.7 | -- | | | Hot. 1. | 16.3 | -- | 850 | 730 | 13.6 2. | 14.0 | 2.3 | | | 3. | 13.4 | -.90 | 730 | | 4. | 12.9 | -- | | | Contd. | ||