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 action of a chassis dynamo auto switch and proposals for its improvement.
| Identifier | WestWitteringFiles\D\March1920\ Scan17 | |
| Date | 15th March 1920 | |
| To CK.{Mr Clark} from R.{Sir Henry Royce} Copy to CS. BN.{W.O. Bentley / Mr Barrington} E.{Mr Elliott - Chief Engineer} X.3958 ORIGINAL. R5/G1D/3/20. 5 15 MAR 1920 RE CHASSIS DYNAMO AUTO SWITCH. X.3770 X.3771 Thank you for your report on the action of matic switch. I am sorry that I had forgotten that in your reports of last year you had given the difference between a hot and cold dynamo, and I am pleased to see that the change of time of cutting in is largely due to the fault of the rise of temperature of the cut-out (which has been modified since the original one was tested) This was not given in combination with the rise in temperature of the dynamo. It would be as well to give the results of the change of temperature of the dynamo and cut-out together. I shall be pleased if you will again send us a Smith cut-out for examination. we presume that it is a larger apparatus with a better magnetic circuit. If any serious difficulty is found with the magnetic dynamo switch on the car, I suggest we tackle this matter in the following way. Firstly, make the apparatus magnetically and mechanically much more perfect than the present lucas pattern. We shall then only have to increase the dimensions very slightly and perhaps make a neater apparatus than the Smith, and will obtain better results by the above improvement, and by forming the fine wire circuit through the switch by partly of copper on the switch and partly of Eureka or Manganim. Such an arrangement would take slightly more current than the Smith arrangement, but would be considerably less [REDACTED] | ||