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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 Mr. Skinner regarding a leaking 'G' type diaphragm on a 6 cyl. Singer, and the potential effect of 'Discol' fuel.

Identifier  ExFiles\Box 149\1\  scan0312
Date  15th September 1936 guessed
  
Dear Mr.Skinner,

I have today come across a "G" type diaphragm fitted some three months ago by ourselves to a 6 cyl. Singer, and returned as leaking, and I am rather inclined to agree.

Upon close examination of the diaphragm you will see that the Dope has almost gone, specially on the petrol side, this has been done through the use of "Discol" fuel by the owner.

This is an interesting point, as I have used this fuel on my own car for the past twelve months and have not discovered any dissolving such as this, only that the rubber connections on the pipeline have perished once; this, of course, I expected. We hope that this is an isolated case of the Discol affecting the diaphragm as we have had in the past great faith in fitting to all pumps that use it.

Your comments will be appreciated.

Yours sincerely,
  
  


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