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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 to Lodge Plugs Ltd. regarding the failure of their X.371 sparking plugs during testing in a Bentley Car.

Identifier  ExFiles\Box 162\6\  img241
Date  16th February 1934
  
84425b.

Hs{Lord Ernest Hives - Chair}/Wst.5/MA.

16th February, 1934.

Messrs. Lodge Plugs Ltd.,
Rugby.

Lodge X.371 Sparking Plugs.

Dear Sirs,

We have now tested these plugs in our Bentley Car and find them to be hopelessly inadequate for the performance require. We are sending six back to you under separate cover, you will see from inspection that severe local heating has taken place.

Yours faithfully,

FOR ROLLS-ROYCE LIMITED.
  
  


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