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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 Plug Ltd. regarding cylinder head modifications affecting plug barrel length.

Identifier  ExFiles\Box 162\6\  img351
Date  28th February 1939
  
6002
EXPERIMENTAL DEPARTMENT.

Rm{William Robotham - Chief Engineer}/RC.{R. Childs}4/JH.
28th. February, 1939.

Messrs. Lodge Plug Ltd.,
RUGBY.

For the attention of Mr. V.{VIENNA} Martin-Jones.

Dear Sirs,

We are sending herewith details of cylinder head as requested. The recent modification to the head has made it permissible to shorten the barrel slightly, if this will improve the performance of the plug. We do not however wish to make it any shorter than your '640' type.

Yours faithfully,

FOR ROLLS-ROYCE LTD.
  
  


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