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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).
Possible cause for a dynamo failure on a 20 HP car, attributing it to a weak brush spring or an external circuit fault.

Identifier  ExFiles\Box 57\2\  Scan067
Date  6th January 1927
  
X5783do

EFC7/T6.1.27.

To BY.{R.W. Bailey - Chief Engineer} from EFC.
c. SFT{Mr Swift}/Mr. Brock.

20 HP. DYNAMO NO. 330 EX CHASSIS 71A4 - C'WOOD.

The only possible reason we can see which should have caused the commutator solder to run is that the negative brush spring has been considerably too weak. We cannot, however, say with certainty whether it is due to this cause or whether it may have been due to some fault in the external circuit.

Dynamo handed herewith to BY.{R.W. Bailey - Chief Engineer}

EFC.
  
  


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