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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 British Insulated Cables Ltd. regarding coils and a drawing for spark gap details.

Identifier  ExFiles\Box 167\3\  img038
Date  29th April 1937
  
6110

Wst/RG.{Mr Rowledge}7/JH.

29th April, 1937.

The British Insulated Cables Ltd.,
Helsby.

Dear Sirs,

With reference to your letter of the 26th inst. ref.HH/FGB. we are sending the coils under separate cover.

With regard to the spark gap; I am sending herewith a drawing of the details to which we work to. The distance between the points being adjusted so that sparking occurs at a peak voltage of 10,000. Fig.1. illustrated the correct arrangement. Will you please arrange to return the enclosed drawing when you have finished with them.

Yours faithfully,

FOR ROLLS-ROYCE LTD.
  
  


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