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 E.575 (R.1276 & R.1318) and Lucas Cut-outs (No.19 & No.29) under hot and cold conditions.
| Identifier | ExFiles\Box 36\4\ scan 037 | |
| Date | 14th May 1920 | |
| R.R. C28A (100 T) S. G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 643. 19-2-20 G 2618 Contd. -6- EFC1/T14.5.20. Dynamo:- Lucas E.575 No. R.1276. Cut-out:-Lucas No.19. Condition. | Volts. | Amperes. | Speed. | Corresponding approx. dynamo balancing speed and volts. | | | | Speed. | Volts. Cold 1. | 12.2 | -- | 620 2. | 12.9 | -1.1 | 3. | 12.8 | -1.1 | 600 4. | 11.9 | -- | | | | | 635 | 13.1 Hot 1. | 14.4 | -- | 740 2. | 14.0 | + .5 | 3. | 13.6 | -.3 | 720 4. | 13.4 | -- | | | | | 720 | 13.9 Dynamo:- Lucas E.575 No. R.1318. Cut-out:- Lucas No.29. Cold 1. | 10.0 | -- | 510 2. | 12.4 | - 5.4 | 3. | 11.9 | - 7.0 | 485 4. | 8.7 | -- | | | | | 645 | 13.4 Hot 1. | 10.9 | -- | 600 2. | 13.3 | - 3.6 | 3. | 13.2 | - 3.6 | 610 4. | 10.9 | -- | | | | | 730 | 14.9 Contd. | ||