Numerous investigators have attempted to develop a new type of differential fluid meter in which, by compensation of the effects of contraction and friction, a constant value of the coefficient of discharge can be maintained at low Reynolds numbers. As a result of the author’s study of this problem, it is concluded that a number of devices offer distinct possibilities of maintaining a constant coefficient of discharge down to low values of Reynolds number. Particularly noteworthy, in the author’s opinion, are the quadrant-edge orifice and the cylindrical nozzle with or without conical diffuser. For both, experimental evidence is available as proof of their satisfactory operation.

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