The filtration characteristics of five Quincke‐Herschel tubes in series were measured in three ways: (a) by observing the ratio of the squares of the excess pressures at the end and beginning of the filter when terminated by a closed and open finite ending; (b) by observing the phase difference between these two pressures for the two cases in (a); and (c) by observing the true power transmission ratio with the filter terminated by an effectively infinite line. The experimental results are plotted with the corresponding theoretical curves. The number of experimental peaks in the transmission regions in (a) and (c), and the positions of the attenuation bands agree with the predictions of the theory. The values of the curve minima in the transmission bands are in excellent agreement up to 5000 cycles. The change of phase over the filter was also found to correspond closely to the theory.