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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 and battery charging rate for a vehicle running in France.

Identifier  ExFiles\Box 62\3\  scan0032
Date  27th February 1930
  
EFC. From Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}
X.6005
Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}3/MJ.27.2.30.

Herewith chart of dynamo output of 14-G4 now running in France.

Hancock remarks - "The chart of the dynamo output shews that it is necessary to have some means of cutting down the charge during daylight running".

Do you agree that this charging rate is likely to be harmful provided the battery is not over-charged?
We do not believe there is anything to worry about.
HS{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}
  
  


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