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 Lucas dynamos and cut-outs, detailing volts, amperes and speed under hot and cold conditions.
| Identifier | WestWitteringFiles\D\May1920\ Scan31 | |
| Date | 14th May 1920 | |
| R.R. 235A (100 T) (S. G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 643, 19-2-20) G 2618 Contd. -7- ZFC1/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. Cold 1. | 12.8 | -- | } 620 2. | 12.7 | +.1 | 3. | 12.45| -2.0 | } 585 4. | 11.0 | -- | In the final columns for the Cold group above, the values are: 620 | 12.7 Hot 1. | 13.8 | -- | } 740 2. | 13.8 | o | 3. | 13.5 | -1.5 | } 690 4. | 12.5 | -- | In the final columns for the Hot group above, the values are: 740 | 13.8 Dynamo:- Lucas E.575 No. R.1331. Cut-out:- Lucas No.129. Cold 1. | 10.4 | -- | } 560 2. | 12.5 | -2.5 | 3. | 12.2 | -3.0 | } 560 4. | 10.7 | -- | In the final columns for the Cold group above, the values are: 640 | 13.6 Hot 1. | 12.5 | -- | } 670 2. | 13.6 | -1.5 | } 620 3. | 16.1 | -3.3 | 4. | 10.8 | -- | In the final columns for the Hot group above, the values are: 720 | 14.3 | ||