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).
Technical memo discussing issues with the Bijur dynamo and distribution board.
| Identifier | WestWitteringFiles\G\June1921\ Scan49 | |
| Date | 1st June 1921 | |
| To R.R. of America Inc. from R.{Sir Henry Royce} -C- R1/G17/6/21 Contd. are arranged on the engine side of the dashboard above the steering box. In this position they can be easily examined should it be thought they were functioning wrongly. Regarding the Bijur dynamo, one of our reasons for being disappointed with this was on account of it being insufficiently silent. This we know, and you will remember that I was using a 6 volt one at West WitteringHenry Royce's home town which was the noisiest dynamo for its size that anybody ever heard of. This, however, may be an exception, or working under exceptional circumstances of having the full magnetism on always, but we know that such dynamos can be made silent, and this is one of the points which you ought to take up with the Bijur company. We may add in passing, that our views in getting this silent are that the armature teeth should be fine instead of coarse, that there should always be the same number of teeth under a pole, and that the teeth should preferably be even in number so that they are balanced by opposite poles. What we have seen of the Bijur dynamo none of these features are adopted, and we venture to express our views on the subject for that reason, also the teeth are often spiral. DISTRIBUTION BOARD. Regarding the distribution board, we assume that you will get one of these made by Bijur or another firm of good quality and of the arrangement of the R.R. design. You will notice with this system of wiring that there is only one earth which is made on this distribution board through a small gauge copper fuse. This naturally is necessary to make the battery ignition circuit complete, but is not required for any other purpose, and therefore for safety can have a fuse that will only carry a few. amperes. (Contd.) | ||