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).
Adding an automatically operated electro-magnetic switch to the dynamo's field winding in the electrical system.
| Identifier | ExFiles\Box 59\1\ Scan076 | |
| Date | 8th October 1926 | |
| Contd. -3- EFCl/T8.10.26. It is possible to make such an addition to an at present third brush or otherwise inherently regulated system by the addition of a unit containing the automatically operated electro-magnetic switch, together with the necessary resistance to be inserted into the field winding of the dynamo, with the necessary terminals, etc. In the case of our own electrical system, we have prepared three such units made up largely of distribution board and cutout parts and it is intended to run two of these units experimentally one on each of our two types of chassis. We have made up these units of distribution board and cutout parts as a matter of convenience, not however suggesting that this would resemble more than remotely the final design, should such a unit every be adopted as standard. In view of the general undesirability of adding further electrical units to a chassis system, the argument being [strikethrough]such[/strikethrough] that such a course adds to the unreliability of the whole system, it is worth while considering the way in which reliability would be affected in this instance. Firstly, the automatic switch is operated much in the same way as the ordinary cutout, and the mechanical reliability of its motion would be of the same order. Secondly, the resistance inserted could be of the same type and even identical with our ignition ballast resistance, and its reliability would therefore be of the same order as that of the ignition apparatus in respect of its ballast resistance. Contd. | ||