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).
The erratic performance of an experimental 12-volt Bijur dynamo and regulator compared to the standard 6-volt system.
| Identifier | ExFiles\Box 180\M2\M2.3\ img025 | |
| Date | 17th August 1920 | |
| Contd. -5- EFC1/T17.8.20. We made a point of telling Mr. Bijur of the erratic operation of the 12 volt Bijur dynamo and regulator which had been sent to us from America. Mr. Bijur stated that it had been found that the vibrator control applied to a 12 volt system was not as satisfactory as for the 6 volt. It was more sensitive to changes in lead resistance, etc., and to the amount of vibration to which it was subjected. The 6 volt systems work admirably and give very little trouble, doing all that is required of them in the way of charging the battery at the right amount at the right time, but 12 volt systems had not been developed to a great extent and therefore the machine sent over here was more of an experimental nature than as representing one of their standard products. He stated that a machine might give perfectly satisfactory results on the car and will give erratic results on the bench. We had, however, run the machine each time with the vibrator subject to the vibration of the dynamo itself, and we cannot ourselves see how there should be such a marked difference between the performances in the two cases. Mr. Bijur was keen on sending us some more of these dynamo sets, but he explained that they have an improved type of regulator going through and it was therefore arranged that the matter of receiving these should be left until they could send us samples incorporating the new design of regulator. It was suggested that they should send us one each of the 12 volt and 6 volts sets so that we can compare Contd. | ||