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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 A.T. Colwell of Thompson Products, Inc., regarding copper-cooled and sodium-cooled valves.

Identifier  ExFiles\Box 174\2\  img303
Date  22th December 1938
  
1260

Rm{William Robotham - Chief Engineer}3/R.{Sir Henry Royce}

22nd December, 1938.

A.T. Colwell, Esq.,
Messrs. Thompson Products, Inc.,
2196, Clarkwood Road,
CLEVELAND.

Dear Colwell,

Thanks very much for your letter of December 12th, together with the information it contained.

I think, under the circumstances, we will not bother with copper-cooled valves for the time being.

I shall be interested to know whether there is any sodium-cooled valve in production in either commercial or passenger car units in the States.

Yours sincerely,
  
  


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