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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).
Dynamo output testing with varying field circuit resistances and battery charge levels.

Identifier  WestWitteringFiles\O\2April1926-June1926\  Scan242
Date  28th June 1926 guessed
  
AC.74.
-4-
Contd.

just above zero. On a discharged Exide battery the full dynamo output was reached with a good margin before operating the controller.

A series of curves (attached) was also taken on a standard dynamo, shewing the effects of various resistances in the field circuit. These fairly well represent what would be obtained on a car with the battery fully charged. The dynamo was run on our scheduled volt-ampere characteristic in obtaining these curves.

EFC/F.J. Allen.
  
  


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