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).
Testing an experimental ballast resistance for the 20 HP Battery Ignition system.

Identifier  ExFiles\Box 168a\5\  img028
Date  18th December 1928
  
To HY.{Tom Haldenby - Plant Engineer} from EFC.
c. EP.{G. Eric Platford - Chief Quality Engineer} Mx.{John H Maddocks - Chief Proving Officer}
X7720
EFC5/T18.12.28.
20 H.P. BATTERY IGNITION.
X5660
Referring to EP{G. Eric Platford - Chief Quality Engineer}6/H17.12.28. we are now urging from the Expl. Shop the completion of our experimental 1‡ value ballast resistance.
Before proposing this for standard it is desirable to make a test of the heating of the present standard coarser primary coil in series with this ballast continuously on voltage overnight. This we intend to do so soon as the ballast is available.
EFC.
  
  


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