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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).
Experimental orifice bore sizes and length ratios for tests on the flow of liquids.

Identifier  ExFiles\Box 36\1\  scan 031
Date  1st April 1917
  
To EFC. from E.{Mr Elliott - Chief Engineer}

E2/B11.4.17.

Re X.2907 - Flow of Liquids through Orifices and Pipes.

With reference to your memo EFC1/AT31317, I think it is preferable to have four points on a curve rather than three, and suggest that we make experimental orifices to the following bores:-

3/64" 3/32" 1/8" 3/16"

With regard to the lengths, I think we ought to have four length ratios, 25 diameters, 20 diameters, 15 diameters, and 10 diameters.

E.{Mr Elliott - Chief Engineer}
  
  


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