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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).
Query regarding the correct jet hole size in ZS.1 filters for a pressure of 30lbs/square inch.

Identifier  ExFiles\Box 135\3\  scan0172
Date  7th September 1937 guessed
  
2.

the amount of carbon matter which has been removed.

One item we should like to know, is whether the size of the jet hole in the inlet union of the ZS.1 filters you have supplied is correct for the pressure at which it is being fed, in our case, 30lbs/square inch.

Yours faithfully,

for ROLLS-ROYCE LTD.
  
  


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