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 data for Lucas E.575 and No.91/129 dynamo and cut-out sets.
| Identifier | ExFiles\Box 36\4\ scan 038 | |
| Date | 14th May 1920 | |
| R.R. 536a (100 T) S. G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 545. 19-2-20 G 2618 Contd. -7- EFC1/T14.5.20. Dynamo:- Lucas E.575. R.1223. Cut-out:- Lucas No.91. Condition. | Volts. | Amperes. | Speed. | Corresponding approx. dynamo balancing speed and volts. | | | | Speed. | Volts. -------------------------------------------------------------------------------- Cold 1. | 12.8 | -- | 620 | | 2. | 12.7 | +.1 | | 620 | 12.7 3. | 12.45 | -2.0 | 585 | | 4. | 11.0 | -- | | | -------------------------------------------------------------------------------- Hot 1. | 13.8 | -- | 740 | | 2. | 13.8 | 0 | | 740 | 13.8 3. | 13.6 | -1.5 | 690 | | 4. | 12.5 | -- | | | Dynamo:- Lucas E.575 No. R.1331. Cut-out:- Lucas No.129. Cold 1. | 10.4 | -- | 560 | | 2. | 12.5 | -2.5 | | 640 | 13.6 3. | 12.2 | -3.0 | 560 | | 4. | 10.7 | -- | | | -------------------------------------------------------------------------------- Hot 1. | 12.5 | -- | 670 | | 2. | 13.6 | -1.5 | | 720 | 14.3 3. | 13.1 | -3.3 | 620 | | 4. | 10.8 | -- | | | | ||