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 performance under cold and hot conditions.
| Identifier | WestWitteringFiles\D\May1920\ Scan30 | |
| Date | 14th May 1920 | |
| R.R. 235A (100 T) (S.G. 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. 13.2 | -- | } 620 | | | 2. 12.9 | -1.1 | | 635 | 13.1 | 3. 12.8 | -1.1 | } 600 | | | 4. 11.9 | -- | | | ------------------------------------------------------------------------------------------------------ Hot. | 1. 14.4 | -- | } 740 | | | 2. 14.0 | + .5 | | 720 | 13.9 | 3. 13.6 | - .3 | } 720 | | | 4. 13.4 | -- | | | ------------------------------------------------------------------------------------------------------ Dynamo:- Lucas E.575 No.R.1318. Cut-out:- Lucas No.29. ------------------------------------------------------------------------------------------------------ Cold. | 1. 10.0 | -- | } 510 | | | 2. 12.4 | -5.4 | | 645 | 13.4 | 3. 11.9 | -7.0 | } 485 | | | 4. 8.7 | -- | | | ------------------------------------------------------------------------------------------------------ Hot. | 1. 10.9 | -- | } 600 | | | 2. 13.3 | -3.6 | | 730 | 14.9 | 3. 13.2 | -3.6 | } 610 | | | 4. 10.9 | -- | | | ------------------------------------------------------------------------------------------------------ Contd. | ||