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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).
Proposal for a 20/25 three-charge scheme for a dynamo, outlining its improvements and disadvantages.

Identifier  ExFiles\Box 163\6\  img219
Date  18th October 1932
  
X6016.

EP.{G. Eric Platford - Chief Quality Engineer} from Hs{Lord Ernest Hives - Chair}/Wst.
C. Ck.{Mr Clark} H.{Arthur M. Hanbury - Head Complaints}

Hs{Lord Ernest Hives - Chair}/Wst.3/KT.18.10.32.

PROPOSED 20/25 THREE CHARGE
SCHEME FOR DYNAMO.

In accordance with your request, we attach herewith a few explanatory notes we have made regarding the operation of this scheme. Whilst we think this scheme is a big improvement over the existing two charge scheme, it still has certain disadvantages, the ideal scheme being a constant voltage controller dynamo.

Hs{Lord Ernest Hives - Chair}/Wst.
  
  


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