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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 Delco & Hyatt Ltd. concerning tests carried out on their coil.

Identifier  ExFiles\Box 164\5\  img378
Date  13th August 1938
  
6017
EXPERIMENTAL DEPARTMENT.
Rm{William Robotham - Chief Engineer}/RC.{R. Childs}9/JH.
13th August, 1938.
Messrs. Delco & Hyatt Ltd.,
111, Grosvenor Gardens,
LONDON.S.W.1.
For the attention of Mr. Rushton.
Dear Sirs,
Herewith copies of tests which we have carried out on your coil. Please note that the working voltage under summer conditions approximates to 15. Also that the inclusion of the harness on the H.T. cables make an appreciable difference to the obtainable output of the coil. We shall be pleased to help in your investigation in any way possible.
Yours faithfully,
FOR ROLLS-ROYCE LTD.
  
  


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