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Supersonic Receivers. The supersonic receivers consist of two nickel
magneto stric-tive receivers mounted on top of a small steel float which is
released by the mine a short time after reaching the bottom, on laying. One
of the receivers is mounted in a cone and has vertical directivity (trichter
schwinger); the other receiver is mounted in a ring around the base of the
cone receiver, and has horizonatl directivity (ring schwinger). Figure 222
shows the directional charasteristics of the two receivers: A, vertical
receiver B, horizontal receiver. |
