By measurement of the unit-mass and the unit-time rates of exchange of energy between a flowing fluid and a heating or actuating source, the rates of mass flow can be directly determined, provided that certain thermodynamic properties of the fluid are known.
Various methods of application of this principle are described and an account of proving tests is given. In these tests special techniques of precision thermometry were used. The results obtained were very promising and warrant further laboratory and field investigations.
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