. Carnegie Institution of Washington publication. 38 DISPLACEMENT INTERFEROMETRY APPLIED TO the U-tube (when i ,000 ohms were in circuit) gave a deflection of but 5 fringes. This maximum (curiously enough) is in the middle, figure 58, in spite of the open hole there. The result appears more clearly when the resistance is re- duced about one-half (500 ohms). It is the d"', probably, which is impressed on the graph of the adjutage, figure 57. The a' pipe (hole opposite adjutage closed) showed two maxima, a large one of 25 fringes at a' and a smaller one of 12 fringes at e" when 1,000 o
. Carnegie Institution of Washington publication. 38 DISPLACEMENT INTERFEROMETRY APPLIED TO the U-tube (when i ,000 ohms were in circuit) gave a deflection of but 5 fringes. This maximum (curiously enough) is in the middle, figure 58, in spite of the open hole there. The result appears more clearly when the resistance is re- duced about one-half (500 ohms). It is the d"', probably, which is impressed on the graph of the adjutage, figure 57. The a' pipe (hole opposite adjutage closed) showed two maxima, a large one of 25 fringes at a' and a smaller one of 12 fringes at e" when 1,000 ohms were in circuit. The latter is possibly impressed on pp by the e" note in the adju- tage. The distribution of compression in depth is also given in figure 58 for this pipe. It increases more gradually toward the center than in the pre- ceding case, a result which suggests a tendency to a re-entrance in the middle for the d" curve. The a' pipe is also much stronger than the d" pipe under the same conditions; but both are usually less than half as strong in their compressions as the closed organ-pipe of the preceding section. The quill-tube glass probe functioned about equally well at d" and a', but the somewhat narrower aluminum-tube probe often refused to give results at d". As I could not detect any defect in the probe, it is probable that the phenomena of §25, relating to nodes in the pin-hole tube, are here in question. If so, pressure would be transferred to the U-tube by means of a vibrating column of 0 4 8 34. Reversal of poles of telephone.—The more or less complete exchange of the maxima and minima of 5, of a closed region, when the telephone current (motor break) is reversed, has already been instanced. Open pipes, however, do not quite conform to this rule. In wide tubes ( cm.) of organ-pipe shape, pressure increments only are found, and these are indifferent to the direction of the telephone Please note that these im
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