Rolls-Royce Archives
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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).
Concluding statement regarding the removal of deposits by cleaning, compared to using mica plugs.

Identifier  ExFiles\Box 162\3\  img027
Date  28th October 1938 guessed
  
-2-

They do not claim entire absence of trouble, but claim that the deposit can be got rid of by cleaning, more throughly than with mica plugs.

G.W.Hancock.
  
  


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