Rolls-Royce Archives
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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).
Experiments on ballast resistances to reduce internal ignition coil heating.

Identifier  ExFiles\Box 168a\5\  img036
Date  16th January 1929
  
EP.{G. Eric Platford - Chief Quality Engineer} from EFC.
X7720
EFC4/T16.1.29.

BALLAST RESISTANCE

Re your enquiry, we have experimented on 1 1/2 value ballast resistances in place of standard double value in regard to internal ignition coil heating, and do not find the heating as small as we hoped. With 1 1/2 value the heating would be reasonable. We therefore now send you three 1 1/2 value resistances for trial. If you say these cure the fault complained of, then it will be arranged forthwith to instruct them as standard.

EFC.
  
  


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