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National Advisory Committee for Aeronautics, Report - Theories of Flow Similtude

The laws of comparison of dynamically similar fluid motions are derived by three different
methods based on the same principle and yielding the same or equivalent formulas, In this
report prepared for publication by the National Advisory Committee for Aeronautics, in
June, 1927, are outlined the three current methods of comparing dynamically similar motions,
more especially of fluids, initiated respectively by Newton, Stokes (or Helmholtz), and Rayleigh.
These three methods, viz., the integral, the differential, and the dimensional, are enough alike
to be studied profitably together. They will presently be treated in succession then compared.