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 sheet for two sets of Lucas dynamos and cut-outs, showing performance figures under hot and cold conditions.
| Identifier | WestWitteringFiles\D\May1920\ Scan32 | |
| Date | 14th May 1920 | |
| R.R. 235A (100 T) (S. G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 643, 19-2-20) G 2618 Contd. -8- EPC1/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 2. | 12.4 | -1.0 | 3. | 12.3 | -1.7 | } 570 4. | 11.0 | -- | Corresponding values: 630 | 13.0 Hot. 1. | 16.5 | -- | } 800 2. | 14.3 | +2.2 | 3. | 13.5 | -1.4 | } 670 4. | 12.9 | -- | Corresponding values: 700 | 14.0 Dynamo:- Lucas E.575 No. R.1293. Cut-out:- Lucas No.1577C. Cold. 1. | 13.3 | -- | } 670 2. | 12.7 | +.80 | 3. | 12.4 | -.50 | } 640 4. | 11.7 | -- | Corresponding values: 650 | 12.55 Hot. 1. | 16.3 | -- | } 850 2. | 14.0 | 2.3 | 3. | 13.4 | -.90 | } 730 4. | 12.9 | -- | Corresponding values: * | 730 | 13.6 Contd. | ||