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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).
Developing an automatic voltage-operated cutout, with reference to the Midgley lighting system and dynamo types.

Identifier  WestWitteringFiles\O\2April1926-June1926\  Scan198
Date  16th June 1926
  
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EFC3/T16.6.26.

It will have been noted that the general question or problem has also been referred to by PN.{Mr Northey} in his PN{Mr Northey}13/DN9.6.26, which contains a definite suggestion that "it would be well worth our while to devise and make a simple form of automatic voltage-operated cutout which shall without any action on the driver's part at all, prevent any continued charge after the voltage per cell has amounted to" a specified amount.

We are of the opinion that we should proceed with experiments with this end in view and subject to R's acquiescence, to arrange an experimental car with an automatic switch of the nature described under the second portion of our general section entitled "Compromises between the Two Extreme Types of Dynamo System."

It may be realised that the particular arrangement referred to is that contained in the Midgley lighting system and this one feature of that system at any rate we consider to be definitely good. We have made experiments on the combined Midgley unit of cutout and controller and the definite results of these experiments will be made the subject of a separate report.

In the meanwhile, however, there are two remarks or statements which seem appropriate here to make. The first is as regards the characteristics of the resistance to be inserted for this purpose in the field circuit of an inherently controlled machine. We find by actual test that

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