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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).
Blueprint of an orifice and a graph of coefficients for Fliegner's formula based on orifice size and pressure drops.

Identifier  ExFiles\Box 27\2\  Scan298
Date  30th October 1934
  
DERBY.
RADIUS = D
QMD
FORM OF ORIFICE USED IN THE INVESTIGATION.
COEFFICIENT
PRESSURE IN INCHES OF WATER
CORRECTED TO 29.921 IN. MERCURY AND 60 DEG. F.{Mr Friese}
1" ORIFICE
1/2" ORIFICE
1/4" ORIFICE
3/8" ORIFICE
1/8" ORIFICE
1/16" ORIFICE
COEFFICIENTS TO BE APPLIED TO FLIEGNER'S FORMULA FOR VARIOUS SIZE ORIFICES AND VARIOUS PRESSURE DROPS.
ROLLS-ROYCE, LTD.
PRINT ROOM
OCT 30 1934
DERBY.
  
  


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