The relations among the variables, namely, specific gravity and viscosity of the liquid and flow-rate or weight and dimensions of the float affecting the performances of the flow meter of this type, were obtained by means of the Dimensional Analysis, and its results were verified by the experiments.
Next, the experimental formula, among the whole tube, of the relations between the flow-rate at the gap area is deduced from the considerations of the flow-pattern at the gap, which is characterized by the number "Rd".
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