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).
Letter describing an ignition fault indicator device for engines, particularly aero engines.

Identifier  ExFiles\Box 33\1\  Scan039
Date  15th October 1920 guessed
  
circuit or circuits; the gaps are enclosed in a case with a glass top or cover & fixed on the dash board. Should a plug get fouled or the magneto fail it is indicated instantly. This device is useful for aero engines or any type of ignition. Enclosed is a sketch of a six cylinder type of indicating box. A reply in any case will be appreciated. Thanking you. Believe me. Yours Faithfully, Frederick W. Conway
  
  


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