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).
Experiments with higher output dynamos and green lamp schemes on various car chassis.
| Identifier | WestWitteringFiles\T\2January1929-June1929\ Scan098 | |
| Date | 5th February 1929 guessed | |
| -3- Contd. to be necessary for the case considered above. We have running on 12-G4 a higher output dynamo in conjunction with the green lamp scheme (separate unit). This has run 5150 miles up to the present though a slight tendency was noted for the operating voltage to become of itself reduced, the reason for which is under investigation. We have also a higher output Phantom dynamo running on chassis 12-EX with a green lamp unit (separate unit), the combination of which has done 5228 miles satisfactorily, the lowering of the operating voltage in this instance having been comparatively minute. We recommend that we continue experimenting on cars with S.S. type distribution board complete with green lamp scheme, but that standard S.S. production will not incorporate this for the moment, and that we accumulate further information in running these with standard output, half increased output, and higher output machines. There may be some difficulty in consistent setting. We know that the operating voltages at similar outputs vary to some extent in various circumstances and from one car to another, according to the make, age, etc. of the battery. It is not certain at the moment whether one universal setting would do for green lamp indicating switches or whether it would ultimately be necessary to provide some sort of adjustment which the user himself could make. Bosch provides such an adjustment on his pre-war external automatic control for dynamo output, but has not done so on the post-war model. EFC. | ||